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621 lines
33 KiB
Python
621 lines
33 KiB
Python
# encoding: utf8
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from django.test import TestCase, override_settings
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from django.db.migrations.autodetector import MigrationAutodetector
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from django.db.migrations.questioner import MigrationQuestioner
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from django.db.migrations.state import ProjectState, ModelState
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from django.db.migrations.graph import MigrationGraph
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from django.db import models
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class AutodetectorTests(TestCase):
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"""
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Tests the migration autodetector.
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"""
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author_empty = ModelState("testapp", "Author", [("id", models.AutoField(primary_key=True))])
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author_name = ModelState("testapp", "Author", [("id", models.AutoField(primary_key=True)), ("name", models.CharField(max_length=200))])
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author_name_longer = ModelState("testapp", "Author", [("id", models.AutoField(primary_key=True)), ("name", models.CharField(max_length=400))])
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author_name_renamed = ModelState("testapp", "Author", [("id", models.AutoField(primary_key=True)), ("names", models.CharField(max_length=200))])
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author_name_default = ModelState("testapp", "Author", [("id", models.AutoField(primary_key=True)), ("name", models.CharField(max_length=200, default='Ada Lovelace'))])
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author_with_book = ModelState("testapp", "Author", [("id", models.AutoField(primary_key=True)), ("name", models.CharField(max_length=200)), ("book", models.ForeignKey("otherapp.Book"))])
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author_renamed_with_book = ModelState("testapp", "Writer", [("id", models.AutoField(primary_key=True)), ("name", models.CharField(max_length=200)), ("book", models.ForeignKey("otherapp.Book"))])
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author_with_publisher_string = ModelState("testapp", "Author", [("id", models.AutoField(primary_key=True)), ("name", models.CharField(max_length=200)), ("publisher_name", models.CharField(max_length=200))])
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author_with_publisher = ModelState("testapp", "Author", [("id", models.AutoField(primary_key=True)), ("name", models.CharField(max_length=200)), ("publisher", models.ForeignKey("testapp.Publisher"))])
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author_with_custom_user = ModelState("testapp", "Author", [("id", models.AutoField(primary_key=True)), ("name", models.CharField(max_length=200)), ("user", models.ForeignKey("thirdapp.CustomUser"))])
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author_proxy = ModelState("testapp", "AuthorProxy", [], {"proxy": True}, ("testapp.author", ))
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author_proxy_notproxy = ModelState("testapp", "AuthorProxy", [], {}, ("testapp.author", ))
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author_unmanaged = ModelState("testapp", "AuthorUnmanaged", [], {"managed": False}, ("testapp.author", ))
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author_unmanaged_managed = ModelState("testapp", "AuthorUnmanaged", [], {}, ("testapp.author", ))
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publisher = ModelState("testapp", "Publisher", [("id", models.AutoField(primary_key=True)), ("name", models.CharField(max_length=100))])
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publisher_with_author = ModelState("testapp", "Publisher", [("id", models.AutoField(primary_key=True)), ("author", models.ForeignKey("testapp.Author")), ("name", models.CharField(max_length=100))])
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publisher_with_book = ModelState("testapp", "Publisher", [("id", models.AutoField(primary_key=True)), ("author", models.ForeignKey("otherapp.Book")), ("name", models.CharField(max_length=100))])
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other_pony = ModelState("otherapp", "Pony", [("id", models.AutoField(primary_key=True))])
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other_stable = ModelState("otherapp", "Stable", [("id", models.AutoField(primary_key=True))])
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third_thing = ModelState("thirdapp", "Thing", [("id", models.AutoField(primary_key=True))])
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book = ModelState("otherapp", "Book", [("id", models.AutoField(primary_key=True)), ("author", models.ForeignKey("testapp.Author")), ("title", models.CharField(max_length=200))])
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book_with_no_author = ModelState("otherapp", "Book", [("id", models.AutoField(primary_key=True)), ("title", models.CharField(max_length=200))])
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book_with_author_renamed = ModelState("otherapp", "Book", [("id", models.AutoField(primary_key=True)), ("author", models.ForeignKey("testapp.Writer")), ("title", models.CharField(max_length=200))])
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book_with_field_and_author_renamed = ModelState("otherapp", "Book", [("id", models.AutoField(primary_key=True)), ("writer", models.ForeignKey("testapp.Writer")), ("title", models.CharField(max_length=200))])
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book_with_multiple_authors = ModelState("otherapp", "Book", [("id", models.AutoField(primary_key=True)), ("authors", models.ManyToManyField("testapp.Author")), ("title", models.CharField(max_length=200))])
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book_with_multiple_authors_through_attribution = ModelState("otherapp", "Book", [("id", models.AutoField(primary_key=True)), ("authors", models.ManyToManyField("testapp.Author", through="otherapp.Attribution")), ("title", models.CharField(max_length=200))])
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book_unique = ModelState("otherapp", "Book", [("id", models.AutoField(primary_key=True)), ("author", models.ForeignKey("testapp.Author")), ("title", models.CharField(max_length=200))], {"unique_together": [("author", "title")]})
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book_unique_2 = ModelState("otherapp", "Book", [("id", models.AutoField(primary_key=True)), ("author", models.ForeignKey("testapp.Author")), ("title", models.CharField(max_length=200))], {"unique_together": [("title", "author")]})
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book_unique_3 = ModelState("otherapp", "Book", [("id", models.AutoField(primary_key=True)), ("newfield", models.IntegerField()), ("author", models.ForeignKey("testapp.Author")), ("title", models.CharField(max_length=200))], {"unique_together": [("title", "newfield")]})
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attribution = ModelState("otherapp", "Attribution", [("id", models.AutoField(primary_key=True)), ("author", models.ForeignKey("testapp.Author")), ("book", models.ForeignKey("otherapp.Book"))])
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edition = ModelState("thirdapp", "Edition", [("id", models.AutoField(primary_key=True)), ("book", models.ForeignKey("otherapp.Book"))])
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custom_user = ModelState("thirdapp", "CustomUser", [("id", models.AutoField(primary_key=True)), ("username", models.CharField(max_length=255))])
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knight = ModelState("eggs", "Knight", [("id", models.AutoField(primary_key=True))])
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rabbit = ModelState("eggs", "Rabbit", [("id", models.AutoField(primary_key=True)), ("knight", models.ForeignKey("eggs.Knight")), ("parent", models.ForeignKey("eggs.Rabbit"))], {"unique_together": [("parent", "knight")]})
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def make_project_state(self, model_states):
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"Shortcut to make ProjectStates from lists of predefined models"
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project_state = ProjectState()
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for model_state in model_states:
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project_state.add_model_state(model_state.clone())
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return project_state
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def test_arrange_for_graph(self):
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"Tests auto-naming of migrations for graph matching."
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# Make a fake graph
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graph = MigrationGraph()
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graph.add_node(("testapp", "0001_initial"), None)
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graph.add_node(("testapp", "0002_foobar"), None)
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graph.add_node(("otherapp", "0001_initial"), None)
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graph.add_dependency(("testapp", "0002_foobar"), ("testapp", "0001_initial"))
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graph.add_dependency(("testapp", "0002_foobar"), ("otherapp", "0001_initial"))
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# Use project state to make a new migration change set
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before = self.make_project_state([])
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after = self.make_project_state([self.author_empty, self.other_pony, self.other_stable])
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autodetector = MigrationAutodetector(before, after)
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changes = autodetector._detect_changes()
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# Run through arrange_for_graph
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changes = autodetector.arrange_for_graph(changes, graph)
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# Make sure there's a new name, deps match, etc.
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self.assertEqual(changes["testapp"][0].name, "0003_author")
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self.assertEqual(changes["testapp"][0].dependencies, [("testapp", "0002_foobar")])
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self.assertEqual(changes["otherapp"][0].name, "0002_pony_stable")
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self.assertEqual(changes["otherapp"][0].dependencies, [("otherapp", "0001_initial")])
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def test_trim_apps(self):
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"Tests that trim does not remove dependencies but does remove unwanted apps"
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# Use project state to make a new migration change set
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before = self.make_project_state([])
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after = self.make_project_state([self.author_empty, self.other_pony, self.other_stable, self.third_thing])
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autodetector = MigrationAutodetector(before, after, MigrationQuestioner(defaults={"ask_initial": True}))
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changes = autodetector._detect_changes()
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# Run through arrange_for_graph
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graph = MigrationGraph()
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changes = autodetector.arrange_for_graph(changes, graph)
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changes["testapp"][0].dependencies.append(("otherapp", "0001_initial"))
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changes = autodetector._trim_to_apps(changes, set(["testapp"]))
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# Make sure there's the right set of migrations
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self.assertEqual(changes["testapp"][0].name, "0001_initial")
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self.assertEqual(changes["otherapp"][0].name, "0001_initial")
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self.assertNotIn("thirdapp", changes)
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def test_new_model(self):
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"Tests autodetection of new models"
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# Make state
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before = self.make_project_state([])
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after = self.make_project_state([self.author_empty])
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autodetector = MigrationAutodetector(before, after)
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changes = autodetector._detect_changes()
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# Right number of migrations?
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self.assertEqual(len(changes['testapp']), 1)
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# Right number of actions?
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migration = changes['testapp'][0]
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self.assertEqual(len(migration.operations), 1)
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# Right action?
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action = migration.operations[0]
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self.assertEqual(action.__class__.__name__, "CreateModel")
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self.assertEqual(action.name, "Author")
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def test_old_model(self):
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"Tests deletion of old models"
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# Make state
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before = self.make_project_state([self.author_empty])
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after = self.make_project_state([])
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autodetector = MigrationAutodetector(before, after)
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changes = autodetector._detect_changes()
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# Right number of migrations?
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self.assertEqual(len(changes['testapp']), 1)
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# Right number of actions?
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migration = changes['testapp'][0]
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self.assertEqual(len(migration.operations), 1)
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# Right action?
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action = migration.operations[0]
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self.assertEqual(action.__class__.__name__, "DeleteModel")
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self.assertEqual(action.name, "Author")
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def test_add_field(self):
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"Tests autodetection of new fields"
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# Make state
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before = self.make_project_state([self.author_empty])
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after = self.make_project_state([self.author_name])
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autodetector = MigrationAutodetector(before, after)
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changes = autodetector._detect_changes()
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# Right number of migrations?
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self.assertEqual(len(changes['testapp']), 1)
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# Right number of actions?
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migration = changes['testapp'][0]
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self.assertEqual(len(migration.operations), 1)
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# Right action?
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action = migration.operations[0]
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self.assertEqual(action.__class__.__name__, "AddField")
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self.assertEqual(action.name, "name")
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def test_remove_field(self):
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"Tests autodetection of removed fields"
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# Make state
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before = self.make_project_state([self.author_name])
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after = self.make_project_state([self.author_empty])
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autodetector = MigrationAutodetector(before, after)
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changes = autodetector._detect_changes()
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# Right number of migrations?
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self.assertEqual(len(changes['testapp']), 1)
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# Right number of actions?
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migration = changes['testapp'][0]
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self.assertEqual(len(migration.operations), 1)
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# Right action?
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action = migration.operations[0]
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self.assertEqual(action.__class__.__name__, "RemoveField")
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self.assertEqual(action.name, "name")
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def test_alter_field(self):
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"Tests autodetection of new fields"
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# Make state
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before = self.make_project_state([self.author_name])
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after = self.make_project_state([self.author_name_longer])
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autodetector = MigrationAutodetector(before, after)
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changes = autodetector._detect_changes()
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# Right number of migrations?
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self.assertEqual(len(changes['testapp']), 1)
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# Right number of actions?
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migration = changes['testapp'][0]
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self.assertEqual(len(migration.operations), 1)
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# Right action?
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action = migration.operations[0]
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self.assertEqual(action.__class__.__name__, "AlterField")
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self.assertEqual(action.name, "name")
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def test_rename_field(self):
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"Tests autodetection of renamed fields"
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# Make state
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before = self.make_project_state([self.author_name])
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after = self.make_project_state([self.author_name_renamed])
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autodetector = MigrationAutodetector(before, after, MigrationQuestioner({"ask_rename": True}))
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changes = autodetector._detect_changes()
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# Right number of migrations?
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self.assertEqual(len(changes['testapp']), 1)
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# Right number of actions?
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migration = changes['testapp'][0]
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self.assertEqual(len(migration.operations), 1)
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# Right action?
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action = migration.operations[0]
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self.assertEqual(action.__class__.__name__, "RenameField")
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self.assertEqual(action.old_name, "name")
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self.assertEqual(action.new_name, "names")
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def test_rename_model(self):
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"Tests autodetection of renamed models"
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# Make state
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before = self.make_project_state([self.author_with_book, self.book])
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after = self.make_project_state([self.author_renamed_with_book, self.book_with_author_renamed])
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autodetector = MigrationAutodetector(before, after, MigrationQuestioner({"ask_rename_model": True}))
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changes = autodetector._detect_changes()
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# Right number of migrations for model rename?
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self.assertEqual(len(changes['testapp']), 1)
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# Right number of actions?
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migration = changes['testapp'][0]
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self.assertEqual(len(migration.operations), 1)
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# Right action?
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action = migration.operations[0]
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self.assertEqual(action.__class__.__name__, "RenameModel")
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self.assertEqual(action.old_name, "Author")
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self.assertEqual(action.new_name, "Writer")
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# Right number of migrations for related field rename?
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self.assertEqual(len(changes['otherapp']), 1)
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# Right number of actions?
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migration = changes['otherapp'][0]
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self.assertEqual(len(migration.operations), 1)
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# Right action?
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action = migration.operations[0]
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self.assertEqual(action.__class__.__name__, "AlterField")
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self.assertEqual(action.name, "author")
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self.assertEqual(action.field.rel.to.__name__, "Writer")
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def test_rename_model_with_renamed_rel_field(self):
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"""
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Tests autodetection of renamed models while simultaneously renaming one
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of the fields that relate to the renamed model.
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"""
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# Make state
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before = self.make_project_state([self.author_with_book, self.book])
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after = self.make_project_state([self.author_renamed_with_book, self.book_with_field_and_author_renamed])
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autodetector = MigrationAutodetector(before, after, MigrationQuestioner({"ask_rename_model": True, "ask_rename": True}))
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changes = autodetector._detect_changes()
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# Right number of migrations for model rename?
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self.assertEqual(len(changes['testapp']), 1)
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# Right number of actions?
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migration = changes['testapp'][0]
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self.assertEqual(len(migration.operations), 1)
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# Right actions?
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action = migration.operations[0]
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self.assertEqual(action.__class__.__name__, "RenameModel")
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self.assertEqual(action.old_name, "Author")
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self.assertEqual(action.new_name, "Writer")
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# Right number of migrations for related field rename?
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self.assertEqual(len(changes['otherapp']), 1)
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# Right number of actions?
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migration = changes['otherapp'][0]
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self.assertEqual(len(migration.operations), 2)
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# Right actions?
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action = migration.operations[0]
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self.assertEqual(action.__class__.__name__, "RenameField")
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self.assertEqual(action.old_name, "author")
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self.assertEqual(action.new_name, "writer")
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action = migration.operations[1]
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self.assertEqual(action.__class__.__name__, "AlterField")
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self.assertEqual(action.name, "writer")
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self.assertEqual(action.field.rel.to.__name__, "Writer")
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def test_fk_dependency(self):
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"Tests that having a ForeignKey automatically adds a dependency"
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# Make state
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before = self.make_project_state([])
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after = self.make_project_state([self.author_name, self.book, self.edition])
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autodetector = MigrationAutodetector(before, after)
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changes = autodetector._detect_changes()
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# Right number of migrations?
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self.assertEqual(len(changes['testapp']), 1)
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self.assertEqual(len(changes['otherapp']), 1)
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self.assertEqual(len(changes['thirdapp']), 1)
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# Right number of actions?
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migration1 = changes['testapp'][0]
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self.assertEqual(len(migration1.operations), 1)
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migration2 = changes['otherapp'][0]
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self.assertEqual(len(migration2.operations), 1)
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migration3 = changes['thirdapp'][0]
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self.assertEqual(len(migration3.operations), 1)
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# Right actions?
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action = migration1.operations[0]
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self.assertEqual(action.__class__.__name__, "CreateModel")
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action = migration2.operations[0]
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self.assertEqual(action.__class__.__name__, "CreateModel")
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action = migration3.operations[0]
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self.assertEqual(action.__class__.__name__, "CreateModel")
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# Right dependencies?
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self.assertEqual(migration1.dependencies, [])
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self.assertEqual(migration2.dependencies, [("testapp", "auto_1")])
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self.assertEqual(migration3.dependencies, [("otherapp", "auto_1")])
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def test_same_app_no_fk_dependency(self):
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"""
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Tests that a migration with a FK between two models of the same app
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does not have a dependency to itself.
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"""
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# Make state
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before = self.make_project_state([])
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after = self.make_project_state([self.author_with_publisher, self.publisher])
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autodetector = MigrationAutodetector(before, after)
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changes = autodetector._detect_changes()
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# Right number of migrations?
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self.assertEqual(len(changes['testapp']), 1)
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# Right number of actions?
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migration = changes['testapp'][0]
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self.assertEqual(len(migration.operations), 2)
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# Right actions?
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action = migration.operations[0]
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self.assertEqual(action.__class__.__name__, "CreateModel")
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action = migration.operations[1]
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self.assertEqual(action.__class__.__name__, "CreateModel")
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# Right dependencies?
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self.assertEqual(migration.dependencies, [])
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def test_circular_fk_dependency(self):
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"""
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Tests that having a circular ForeignKey dependency automatically
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resolves the situation into 2 migrations on one side and 1 on the other.
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"""
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# Make state
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before = self.make_project_state([])
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after = self.make_project_state([self.author_with_book, self.book, self.publisher_with_book])
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autodetector = MigrationAutodetector(before, after)
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changes = autodetector._detect_changes()
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# Right number of migrations?
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self.assertEqual(len(changes['testapp']), 1)
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self.assertEqual(len(changes['otherapp']), 2)
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# Right number of actions?
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migration1 = changes['testapp'][0]
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self.assertEqual(len(migration1.operations), 2)
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migration2 = changes['otherapp'][0]
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self.assertEqual(len(migration2.operations), 1)
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migration3 = changes['otherapp'][1]
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self.assertEqual(len(migration2.operations), 1)
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# Right actions?
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action = migration1.operations[0]
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self.assertEqual(action.__class__.__name__, "CreateModel")
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action = migration2.operations[0]
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self.assertEqual(action.__class__.__name__, "CreateModel")
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self.assertEqual(len(action.fields), 2)
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action = migration3.operations[0]
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self.assertEqual(action.__class__.__name__, "AddField")
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self.assertEqual(action.name, "author")
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# Right dependencies?
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self.assertEqual(migration1.dependencies, [("otherapp", "auto_1")])
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self.assertEqual(migration2.dependencies, [('testapp', '__first__')])
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self.assertEqual(set(migration3.dependencies), set([("otherapp", "auto_1"), ("testapp", "auto_1")]))
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def test_same_app_circular_fk_dependency(self):
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"""
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Tests that a migration with a FK between two models of the same app
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does not have a dependency to itself.
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"""
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# Make state
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before = self.make_project_state([])
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after = self.make_project_state([self.author_with_publisher, self.publisher_with_author])
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autodetector = MigrationAutodetector(before, after)
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changes = autodetector._detect_changes()
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# Right number of migrations?
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self.assertEqual(len(changes['testapp']), 2)
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# Right number of actions?
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migration1 = changes['testapp'][0]
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self.assertEqual(len(migration1.operations), 2)
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migration2 = changes['testapp'][1]
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self.assertEqual(len(migration2.operations), 1)
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# Right actions?
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action = migration1.operations[0]
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self.assertEqual(action.__class__.__name__, "CreateModel")
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action = migration1.operations[1]
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self.assertEqual(action.__class__.__name__, "CreateModel")
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action = migration2.operations[0]
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self.assertEqual(action.__class__.__name__, "AddField")
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self.assertEqual(action.name, "publisher")
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# Right dependencies?
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self.assertEqual(migration1.dependencies, [])
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self.assertEqual(migration2.dependencies, [("testapp", "auto_1")])
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def test_same_app_circular_fk_dependency_and_unique_together(self):
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"""
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Tests that a migration with circular FK dependency does not try to
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create unique together constraint before creating all required fields first.
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See ticket #22275.
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"""
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# Make state
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before = self.make_project_state([])
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after = self.make_project_state([self.knight, self.rabbit])
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autodetector = MigrationAutodetector(before, after)
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changes = autodetector._detect_changes()
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# Right number of migrations?
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self.assertEqual(len(changes['eggs']), 2)
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# Right number of actions?
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migration1 = changes['eggs'][0]
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self.assertEqual(len(migration1.operations), 2)
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migration2 = changes['eggs'][1]
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self.assertEqual(len(migration2.operations), 2)
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# Right actions?
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action = migration1.operations[0]
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self.assertEqual(action.__class__.__name__, "CreateModel")
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action = migration1.operations[1]
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self.assertEqual(action.__class__.__name__, "CreateModel")
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# CreateModel action for Rabbit should not have unique_together now
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self.assertEqual(action.name, "Rabbit")
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self.assertFalse("unique_together" in action.options)
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action = migration2.operations[0]
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self.assertEqual(action.__class__.__name__, "AddField")
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self.assertEqual(action.name, "parent")
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action = migration2.operations[1]
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self.assertEqual(action.__class__.__name__, "AlterUniqueTogether")
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self.assertEqual(action.name, "rabbit")
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# Right dependencies?
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self.assertEqual(migration1.dependencies, [])
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self.assertEqual(migration2.dependencies, [("eggs", "auto_1")])
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def test_unique_together(self):
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"Tests unique_together detection"
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# Make state
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before = self.make_project_state([self.author_empty, self.book])
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after = self.make_project_state([self.author_empty, self.book_unique])
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autodetector = MigrationAutodetector(before, after)
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changes = autodetector._detect_changes()
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# Right number of migrations?
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self.assertEqual(len(changes['otherapp']), 1)
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# Right number of actions?
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migration = changes['otherapp'][0]
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self.assertEqual(len(migration.operations), 1)
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# Right action?
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action = migration.operations[0]
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self.assertEqual(action.__class__.__name__, "AlterUniqueTogether")
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self.assertEqual(action.name, "book")
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self.assertEqual(action.unique_together, set([("author", "title")]))
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def test_unique_together_ordering(self):
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"Tests that unique_together also triggers on ordering changes"
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# Make state
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before = self.make_project_state([self.author_empty, self.book_unique])
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after = self.make_project_state([self.author_empty, self.book_unique_2])
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autodetector = MigrationAutodetector(before, after)
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changes = autodetector._detect_changes()
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# Right number of migrations?
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self.assertEqual(len(changes['otherapp']), 1)
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# Right number of actions?
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migration = changes['otherapp'][0]
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self.assertEqual(len(migration.operations), 1)
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# Right action?
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action = migration.operations[0]
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self.assertEqual(action.__class__.__name__, "AlterUniqueTogether")
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self.assertEqual(action.name, "book")
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self.assertEqual(action.unique_together, set([("title", "author")]))
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def test_add_field_and_unique_together(self):
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"Tests that added fields will be created before using them in unique together"
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before = self.make_project_state([self.author_empty, self.book])
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after = self.make_project_state([self.author_empty, self.book_unique_3])
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autodetector = MigrationAutodetector(before, after)
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changes = autodetector._detect_changes()
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# Right number of migrations?
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self.assertEqual(len(changes['otherapp']), 1)
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# Right number of actions?
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migration = changes['otherapp'][0]
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self.assertEqual(len(migration.operations), 2)
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# Right actions order?
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action1 = migration.operations[0]
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action2 = migration.operations[1]
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self.assertEqual(action1.__class__.__name__, "AddField")
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self.assertEqual(action2.__class__.__name__, "AlterUniqueTogether")
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self.assertEqual(action2.unique_together, set([("title", "newfield")]))
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def test_proxy_ignorance(self):
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"Tests that the autodetector correctly ignores proxy models"
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# First, we test adding a proxy model
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before = self.make_project_state([self.author_empty])
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after = self.make_project_state([self.author_empty, self.author_proxy])
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autodetector = MigrationAutodetector(before, after)
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changes = autodetector._detect_changes()
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# Right number of migrations?
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self.assertEqual(len(changes), 0)
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# Now, we test turning a proxy model into a non-proxy model
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before = self.make_project_state([self.author_empty, self.author_proxy])
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after = self.make_project_state([self.author_empty, self.author_proxy_notproxy])
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autodetector = MigrationAutodetector(before, after)
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changes = autodetector._detect_changes()
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# Right number of migrations?
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self.assertEqual(len(changes['testapp']), 1)
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# Right number of actions?
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migration = changes['testapp'][0]
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self.assertEqual(len(migration.operations), 1)
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# Right action?
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action = migration.operations[0]
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self.assertEqual(action.__class__.__name__, "CreateModel")
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self.assertEqual(action.name, "AuthorProxy")
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def test_unmanaged_ignorance(self):
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"Tests that the autodetector correctly ignores managed models"
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# First, we test adding an unmanaged model
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before = self.make_project_state([self.author_empty])
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after = self.make_project_state([self.author_empty, self.author_unmanaged])
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autodetector = MigrationAutodetector(before, after)
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changes = autodetector._detect_changes()
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# Right number of migrations?
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self.assertEqual(len(changes), 0)
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# Now, we test turning an unmanaged model into a managed model
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before = self.make_project_state([self.author_empty, self.author_unmanaged])
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after = self.make_project_state([self.author_empty, self.author_unmanaged_managed])
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autodetector = MigrationAutodetector(before, after)
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changes = autodetector._detect_changes()
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# Right number of migrations?
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self.assertEqual(len(changes['testapp']), 1)
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# Right number of actions?
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migration = changes['testapp'][0]
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self.assertEqual(len(migration.operations), 1)
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# Right action?
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action = migration.operations[0]
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self.assertEqual(action.__class__.__name__, "CreateModel")
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self.assertEqual(action.name, "AuthorUnmanaged")
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@override_settings(AUTH_USER_MODEL="thirdapp.CustomUser")
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def test_swappable(self):
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before = self.make_project_state([self.custom_user])
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after = self.make_project_state([self.custom_user, self.author_with_custom_user])
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autodetector = MigrationAutodetector(before, after)
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changes = autodetector._detect_changes()
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# Right number of migrations?
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self.assertEqual(len(changes), 1)
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# Check the dependency is correct
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migration = changes['testapp'][0]
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self.assertEqual(migration.dependencies, [("__setting__", "AUTH_USER_MODEL")])
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def test_add_field_with_default(self):
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"""
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Adding a field with a default should work (#22030).
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"""
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# Make state
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before = self.make_project_state([self.author_empty])
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after = self.make_project_state([self.author_name_default])
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autodetector = MigrationAutodetector(before, after)
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changes = autodetector._detect_changes()
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# Right number of migrations?
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self.assertEqual(len(changes['testapp']), 1)
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# Right number of actions?
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migration = changes['testapp'][0]
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self.assertEqual(len(migration.operations), 1)
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# Right action?
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action = migration.operations[0]
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self.assertEqual(action.__class__.__name__, "AddField")
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self.assertEqual(action.name, "name")
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def test_replace_string_with_foreignkey(self):
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"""
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Adding an FK in the same "spot" as a deleted CharField should work. (#22300).
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"""
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# Make state
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before = self.make_project_state([self.author_with_publisher_string])
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after = self.make_project_state([self.author_with_publisher, self.publisher])
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autodetector = MigrationAutodetector(before, after)
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changes = autodetector._detect_changes()
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# Right number of migrations?
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self.assertEqual(len(changes['testapp']), 1)
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# Right number of actions?
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migration = changes['testapp'][0]
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self.assertEqual(len(migration.operations), 3)
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# Right actions?
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action = migration.operations[0]
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self.assertEqual(action.__class__.__name__, "CreateModel")
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self.assertEqual(action.name, "Publisher")
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action = migration.operations[1]
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self.assertEqual(action.__class__.__name__, "AddField")
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self.assertEqual(action.name, "publisher")
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action = migration.operations[2]
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self.assertEqual(action.__class__.__name__, "RemoveField")
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self.assertEqual(action.name, "publisher_name")
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def test_foreign_key_removed_before_target_model(self):
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"""
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Removing an FK and the model it targets in the same change must remove
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the FK field before the model to maintain consistency.
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"""
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before = self.make_project_state([self.author_with_publisher, self.publisher])
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after = self.make_project_state([self.author_name]) # removes both the model and FK
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autodetector = MigrationAutodetector(before, after)
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changes = autodetector._detect_changes()
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# Right number of migrations?
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self.assertEqual(len(changes['testapp']), 1)
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# Right number of actions?
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migration = changes['testapp'][0]
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self.assertEqual(len(migration.operations), 2)
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# Right actions in right order?
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action = migration.operations[0]
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self.assertEqual(action.__class__.__name__, "RemoveField")
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self.assertEqual(action.name, "publisher")
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action = migration.operations[1]
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self.assertEqual(action.__class__.__name__, "DeleteModel")
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self.assertEqual(action.name, "Publisher")
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def test_many_to_many_removed_before_through_model(self):
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"""
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Removing a ManyToManyField and the "through" model in the same change must remove
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the field before the model to maintain consistency.
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"""
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before = self.make_project_state([self.book_with_multiple_authors_through_attribution, self.author_name, self.attribution])
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after = self.make_project_state([self.book_with_no_author, self.author_name]) # removes both the through model and ManyToMany
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autodetector = MigrationAutodetector(before, after)
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changes = autodetector._detect_changes()
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# Right number of migrations?
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self.assertEqual(len(changes['otherapp']), 1)
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# Right number of actions?
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migration = changes['otherapp'][0]
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self.assertEqual(len(migration.operations), 2)
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# Right actions in right order?
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action = migration.operations[0]
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self.assertEqual(action.__class__.__name__, "RemoveField")
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self.assertEqual(action.name, "authors")
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action = migration.operations[1]
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self.assertEqual(action.__class__.__name__, "DeleteModel")
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self.assertEqual(action.name, "Attribution")
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