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10ea9ef012
When a related field is deleted, the related model must be updated. As
unchanged models are shared in migration states, the related model must
be re-rendered so that the change applies to a new copy of the related
model.
Thanks Henrik Heimbuerger for the report.
Backport of 58d0dd9260 from master
630 lines
23 KiB
Python
630 lines
23 KiB
Python
from django.apps.registry import Apps
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from django.db import models
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from django.db.migrations.operations import DeleteModel, RemoveField
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from django.db.migrations.state import (
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InvalidBasesError, ModelState, ProjectState,
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)
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from django.test import TestCase
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from .models import (
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FoodManager, FoodQuerySet, ModelWithCustomBase, NoMigrationFoodManager,
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)
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class StateTests(TestCase):
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"""
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Tests state construction, rendering and modification by operations.
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"""
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def test_create(self):
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"""
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Tests making a ProjectState from an Apps
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"""
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new_apps = Apps(["migrations"])
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class Author(models.Model):
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name = models.CharField(max_length=255)
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bio = models.TextField()
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age = models.IntegerField(blank=True, null=True)
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class Meta:
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app_label = "migrations"
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apps = new_apps
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unique_together = ["name", "bio"]
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index_together = ["bio", "age"]
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class AuthorProxy(Author):
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class Meta:
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app_label = "migrations"
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apps = new_apps
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proxy = True
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ordering = ["name"]
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class SubAuthor(Author):
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width = models.FloatField(null=True)
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class Meta:
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app_label = "migrations"
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apps = new_apps
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class Book(models.Model):
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title = models.CharField(max_length=1000)
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author = models.ForeignKey(Author)
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contributors = models.ManyToManyField(Author)
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class Meta:
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app_label = "migrations"
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apps = new_apps
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verbose_name = "tome"
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db_table = "test_tome"
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class Food(models.Model):
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food_mgr = FoodManager('a', 'b')
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food_qs = FoodQuerySet.as_manager()
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food_no_mgr = NoMigrationFoodManager('x', 'y')
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class Meta:
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app_label = "migrations"
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apps = new_apps
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class FoodNoManagers(models.Model):
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class Meta:
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app_label = "migrations"
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apps = new_apps
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class FoodNoDefaultManager(models.Model):
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food_no_mgr = NoMigrationFoodManager('x', 'y')
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food_mgr = FoodManager('a', 'b')
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food_qs = FoodQuerySet.as_manager()
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class Meta:
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app_label = "migrations"
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apps = new_apps
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mgr1 = FoodManager('a', 'b')
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mgr2 = FoodManager('x', 'y', c=3, d=4)
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class FoodOrderedManagers(models.Model):
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# The managers on this model should be ordered by their creation
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# counter and not by the order in model body
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food_no_mgr = NoMigrationFoodManager('x', 'y')
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food_mgr2 = mgr2
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food_mgr1 = mgr1
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class Meta:
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app_label = "migrations"
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apps = new_apps
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project_state = ProjectState.from_apps(new_apps)
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author_state = project_state.models['migrations', 'author']
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author_proxy_state = project_state.models['migrations', 'authorproxy']
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sub_author_state = project_state.models['migrations', 'subauthor']
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book_state = project_state.models['migrations', 'book']
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food_state = project_state.models['migrations', 'food']
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food_no_managers_state = project_state.models['migrations', 'foodnomanagers']
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food_no_default_manager_state = project_state.models['migrations', 'foodnodefaultmanager']
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food_order_manager_state = project_state.models['migrations', 'foodorderedmanagers']
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self.assertEqual(author_state.app_label, "migrations")
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self.assertEqual(author_state.name, "Author")
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self.assertEqual([x for x, y in author_state.fields], ["id", "name", "bio", "age"])
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self.assertEqual(author_state.fields[1][1].max_length, 255)
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self.assertEqual(author_state.fields[2][1].null, False)
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self.assertEqual(author_state.fields[3][1].null, True)
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self.assertEqual(author_state.options, {"unique_together": {("name", "bio")}, "index_together": {("bio", "age")}})
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self.assertEqual(author_state.bases, (models.Model, ))
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self.assertEqual(book_state.app_label, "migrations")
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self.assertEqual(book_state.name, "Book")
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self.assertEqual([x for x, y in book_state.fields], ["id", "title", "author", "contributors"])
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self.assertEqual(book_state.fields[1][1].max_length, 1000)
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self.assertEqual(book_state.fields[2][1].null, False)
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self.assertEqual(book_state.fields[3][1].__class__.__name__, "ManyToManyField")
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self.assertEqual(book_state.options, {"verbose_name": "tome", "db_table": "test_tome"})
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self.assertEqual(book_state.bases, (models.Model, ))
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self.assertEqual(author_proxy_state.app_label, "migrations")
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self.assertEqual(author_proxy_state.name, "AuthorProxy")
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self.assertEqual(author_proxy_state.fields, [])
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self.assertEqual(author_proxy_state.options, {"proxy": True, "ordering": ["name"]})
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self.assertEqual(author_proxy_state.bases, ("migrations.author", ))
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self.assertEqual(sub_author_state.app_label, "migrations")
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self.assertEqual(sub_author_state.name, "SubAuthor")
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self.assertEqual(len(sub_author_state.fields), 2)
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self.assertEqual(sub_author_state.bases, ("migrations.author", ))
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# The default manager is used in migrations
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self.assertEqual([name for name, mgr in food_state.managers], ['food_mgr'])
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self.assertEqual(food_state.managers[0][1].args, ('a', 'b', 1, 2))
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# No explicit managers defined. Migrations will fall back to the default
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self.assertEqual(food_no_managers_state.managers, [])
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# food_mgr is used in migration but isn't the default mgr, hence add the
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# default
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self.assertEqual([name for name, mgr in food_no_default_manager_state.managers],
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['food_no_mgr', 'food_mgr'])
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self.assertEqual(food_no_default_manager_state.managers[0][1].__class__, models.Manager)
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self.assertIsInstance(food_no_default_manager_state.managers[1][1], FoodManager)
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self.assertEqual([name for name, mgr in food_order_manager_state.managers],
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['food_mgr1', 'food_mgr2'])
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self.assertEqual([mgr.args for name, mgr in food_order_manager_state.managers],
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[('a', 'b', 1, 2), ('x', 'y', 3, 4)])
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def test_render(self):
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"""
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Tests rendering a ProjectState into an Apps.
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"""
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project_state = ProjectState()
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project_state.add_model(ModelState(
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app_label="migrations",
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name="Tag",
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fields=[
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("id", models.AutoField(primary_key=True)),
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("name", models.CharField(max_length=100)),
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("hidden", models.BooleanField()),
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],
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))
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project_state.add_model(ModelState(
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app_label="migrations",
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name="SubTag",
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fields=[
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('tag_ptr', models.OneToOneField(
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auto_created=True,
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primary_key=True,
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to_field='id',
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serialize=False,
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to='migrations.Tag',
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)),
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("awesome", models.BooleanField()),
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],
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bases=("migrations.Tag",),
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))
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base_mgr = models.Manager()
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mgr1 = FoodManager('a', 'b')
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mgr2 = FoodManager('x', 'y', c=3, d=4)
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project_state.add_model(ModelState(
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app_label="migrations",
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name="Food",
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fields=[
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("id", models.AutoField(primary_key=True)),
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],
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managers=[
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# The ordering we really want is objects, mgr1, mgr2
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('default', base_mgr),
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('food_mgr2', mgr2),
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('food_mgr1', mgr1),
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]
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))
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new_apps = project_state.apps
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self.assertEqual(new_apps.get_model("migrations", "Tag")._meta.get_field("name").max_length, 100)
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self.assertEqual(new_apps.get_model("migrations", "Tag")._meta.get_field("hidden").null, False)
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self.assertEqual(len(new_apps.get_model("migrations", "SubTag")._meta.local_fields), 2)
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Food = new_apps.get_model("migrations", "Food")
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managers = sorted(Food._meta.managers)
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self.assertEqual([mgr.name for _, mgr, _ in managers],
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['default', 'food_mgr1', 'food_mgr2'])
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self.assertEqual([mgr.__class__ for _, mgr, _ in managers],
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[models.Manager, FoodManager, FoodManager])
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self.assertIs(managers[0][1], Food._default_manager)
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def test_render_model_inheritance(self):
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class Book(models.Model):
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title = models.CharField(max_length=1000)
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class Meta:
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app_label = "migrations"
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apps = Apps()
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class Novel(Book):
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class Meta:
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app_label = "migrations"
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apps = Apps()
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# First, test rendering individually
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apps = Apps(["migrations"])
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# We shouldn't be able to render yet
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ms = ModelState.from_model(Novel)
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with self.assertRaises(InvalidBasesError):
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ms.render(apps)
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# Once the parent model is in the app registry, it should be fine
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ModelState.from_model(Book).render(apps)
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ModelState.from_model(Novel).render(apps)
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def test_render_model_with_multiple_inheritance(self):
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class Foo(models.Model):
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class Meta:
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app_label = "migrations"
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apps = Apps()
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class Bar(models.Model):
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class Meta:
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app_label = "migrations"
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apps = Apps()
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class FooBar(Foo, Bar):
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class Meta:
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app_label = "migrations"
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apps = Apps()
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class AbstractSubFooBar(FooBar):
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class Meta:
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abstract = True
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apps = Apps()
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class SubFooBar(AbstractSubFooBar):
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class Meta:
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app_label = "migrations"
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apps = Apps()
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apps = Apps(["migrations"])
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# We shouldn't be able to render yet
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ms = ModelState.from_model(FooBar)
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with self.assertRaises(InvalidBasesError):
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ms.render(apps)
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# Once the parent models are in the app registry, it should be fine
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ModelState.from_model(Foo).render(apps)
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self.assertSequenceEqual(ModelState.from_model(Foo).bases, [models.Model])
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ModelState.from_model(Bar).render(apps)
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self.assertSequenceEqual(ModelState.from_model(Bar).bases, [models.Model])
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ModelState.from_model(FooBar).render(apps)
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self.assertSequenceEqual(ModelState.from_model(FooBar).bases, ['migrations.foo', 'migrations.bar'])
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ModelState.from_model(SubFooBar).render(apps)
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self.assertSequenceEqual(ModelState.from_model(SubFooBar).bases, ['migrations.foobar'])
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def test_render_project_dependencies(self):
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"""
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Tests that the ProjectState render method correctly renders models
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to account for inter-model base dependencies.
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"""
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new_apps = Apps()
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class A(models.Model):
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class Meta:
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app_label = "migrations"
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apps = new_apps
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class B(A):
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class Meta:
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app_label = "migrations"
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apps = new_apps
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class C(B):
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class Meta:
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app_label = "migrations"
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apps = new_apps
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class D(A):
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class Meta:
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app_label = "migrations"
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apps = new_apps
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class E(B):
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class Meta:
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app_label = "migrations"
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apps = new_apps
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proxy = True
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class F(D):
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class Meta:
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app_label = "migrations"
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apps = new_apps
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proxy = True
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# Make a ProjectState and render it
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project_state = ProjectState()
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project_state.add_model(ModelState.from_model(A))
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project_state.add_model(ModelState.from_model(B))
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project_state.add_model(ModelState.from_model(C))
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project_state.add_model(ModelState.from_model(D))
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project_state.add_model(ModelState.from_model(E))
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project_state.add_model(ModelState.from_model(F))
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final_apps = project_state.apps
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self.assertEqual(len(final_apps.get_models()), 6)
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# Now make an invalid ProjectState and make sure it fails
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project_state = ProjectState()
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project_state.add_model(ModelState.from_model(A))
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project_state.add_model(ModelState.from_model(B))
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project_state.add_model(ModelState.from_model(C))
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project_state.add_model(ModelState.from_model(F))
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with self.assertRaises(InvalidBasesError):
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project_state.apps
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def test_render_unique_app_labels(self):
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"""
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Tests that the ProjectState render method doesn't raise an
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ImproperlyConfigured exception about unique labels if two dotted app
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names have the same last part.
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"""
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class A(models.Model):
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class Meta:
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app_label = "django.contrib.auth"
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class B(models.Model):
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class Meta:
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app_label = "vendor.auth"
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# Make a ProjectState and render it
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project_state = ProjectState()
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project_state.add_model(ModelState.from_model(A))
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project_state.add_model(ModelState.from_model(B))
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self.assertEqual(len(project_state.apps.get_models()), 2)
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def test_remove_relations(self):
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"""
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#24225 - Tests that relations between models are updated while
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remaining the relations and references for models of an old state.
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"""
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class A(models.Model):
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class Meta:
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app_label = "something"
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class B(models.Model):
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to_a = models.ForeignKey(A)
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class Meta:
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app_label = "something"
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def get_model_a(state):
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return [mod for mod in state.apps.get_models() if mod._meta.model_name == 'a'][0]
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project_state = ProjectState()
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project_state.add_model(ModelState.from_model(A))
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project_state.add_model(ModelState.from_model(B))
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self.assertEqual(len(get_model_a(project_state)._meta.related_objects), 1)
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old_state = project_state.clone()
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operation = RemoveField("b", "to_a")
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operation.state_forwards("something", project_state)
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# Tests that model from old_state still has the relation
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model_a_old = get_model_a(old_state)
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model_a_new = get_model_a(project_state)
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self.assertIsNot(model_a_old, model_a_new)
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self.assertEqual(len(model_a_old._meta.related_objects), 1)
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self.assertEqual(len(model_a_new._meta.related_objects), 0)
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# Same test for deleted model
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project_state = ProjectState()
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project_state.add_model(ModelState.from_model(A))
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project_state.add_model(ModelState.from_model(B))
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old_state = project_state.clone()
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operation = DeleteModel("b")
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operation.state_forwards("something", project_state)
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model_a_old = get_model_a(old_state)
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model_a_new = get_model_a(project_state)
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self.assertIsNot(model_a_old, model_a_new)
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self.assertEqual(len(model_a_old._meta.related_objects), 1)
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self.assertEqual(len(model_a_new._meta.related_objects), 0)
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def test_equality(self):
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"""
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Tests that == and != are implemented correctly.
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"""
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# Test two things that should be equal
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project_state = ProjectState()
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project_state.add_model(ModelState(
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"migrations",
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"Tag",
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[
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("id", models.AutoField(primary_key=True)),
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("name", models.CharField(max_length=100)),
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("hidden", models.BooleanField()),
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],
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{},
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None,
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))
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project_state.apps # Fill the apps cached property
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other_state = project_state.clone()
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self.assertEqual(project_state, project_state)
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self.assertEqual(project_state, other_state)
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self.assertEqual(project_state != project_state, False)
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self.assertEqual(project_state != other_state, False)
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self.assertNotEqual(project_state.apps, other_state.apps)
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# Make a very small change (max_len 99) and see if that affects it
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project_state = ProjectState()
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project_state.add_model(ModelState(
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"migrations",
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"Tag",
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[
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("id", models.AutoField(primary_key=True)),
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("name", models.CharField(max_length=99)),
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("hidden", models.BooleanField()),
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],
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{},
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None,
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))
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self.assertNotEqual(project_state, other_state)
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self.assertEqual(project_state == other_state, False)
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def test_dangling_references_throw_error(self):
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new_apps = Apps()
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class Author(models.Model):
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name = models.TextField()
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class Meta:
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app_label = "migrations"
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apps = new_apps
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class Book(models.Model):
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author = models.ForeignKey(Author)
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class Meta:
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app_label = "migrations"
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apps = new_apps
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class Magazine(models.Model):
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authors = models.ManyToManyField(Author)
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class Meta:
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app_label = "migrations"
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apps = new_apps
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# Make a valid ProjectState and render it
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project_state = ProjectState()
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project_state.add_model(ModelState.from_model(Author))
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project_state.add_model(ModelState.from_model(Book))
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project_state.add_model(ModelState.from_model(Magazine))
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self.assertEqual(len(project_state.apps.get_models()), 3)
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# now make an invalid one with a ForeignKey
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project_state = ProjectState()
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project_state.add_model(ModelState.from_model(Book))
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with self.assertRaises(ValueError):
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project_state.apps
|
|
|
|
# and another with ManyToManyField
|
|
project_state = ProjectState()
|
|
project_state.add_model(ModelState.from_model(Magazine))
|
|
with self.assertRaises(ValueError):
|
|
project_state.apps
|
|
|
|
def test_real_apps(self):
|
|
"""
|
|
Tests that including real apps can resolve dangling FK errors.
|
|
This test relies on the fact that contenttypes is always loaded.
|
|
"""
|
|
new_apps = Apps()
|
|
|
|
class TestModel(models.Model):
|
|
ct = models.ForeignKey("contenttypes.ContentType")
|
|
|
|
class Meta:
|
|
app_label = "migrations"
|
|
apps = new_apps
|
|
|
|
# If we just stick it into an empty state it should fail
|
|
project_state = ProjectState()
|
|
project_state.add_model(ModelState.from_model(TestModel))
|
|
with self.assertRaises(ValueError):
|
|
project_state.apps
|
|
|
|
# If we include the real app it should succeed
|
|
project_state = ProjectState(real_apps=["contenttypes"])
|
|
project_state.add_model(ModelState.from_model(TestModel))
|
|
rendered_state = project_state.apps
|
|
self.assertEqual(
|
|
len([x for x in rendered_state.get_models() if x._meta.app_label == "migrations"]),
|
|
1,
|
|
)
|
|
|
|
def test_ignore_order_wrt(self):
|
|
"""
|
|
Makes sure ProjectState doesn't include OrderWrt fields when
|
|
making from existing models.
|
|
"""
|
|
new_apps = Apps()
|
|
|
|
class Author(models.Model):
|
|
name = models.TextField()
|
|
|
|
class Meta:
|
|
app_label = "migrations"
|
|
apps = new_apps
|
|
|
|
class Book(models.Model):
|
|
author = models.ForeignKey(Author)
|
|
|
|
class Meta:
|
|
app_label = "migrations"
|
|
apps = new_apps
|
|
order_with_respect_to = "author"
|
|
|
|
# Make a valid ProjectState and render it
|
|
project_state = ProjectState()
|
|
project_state.add_model(ModelState.from_model(Author))
|
|
project_state.add_model(ModelState.from_model(Book))
|
|
self.assertEqual(
|
|
[name for name, field in project_state.models["migrations", "book"].fields],
|
|
["id", "author"],
|
|
)
|
|
|
|
def test_manager_refer_correct_model_version(self):
|
|
"""
|
|
#24147 - Tests that managers refer to the correct version of a
|
|
historical model
|
|
"""
|
|
project_state = ProjectState()
|
|
project_state.add_model(ModelState(
|
|
app_label="migrations",
|
|
name="Tag",
|
|
fields=[
|
|
("id", models.AutoField(primary_key=True)),
|
|
("hidden", models.BooleanField()),
|
|
],
|
|
managers=[
|
|
('food_mgr', FoodManager('a', 'b')),
|
|
('food_qs', FoodQuerySet.as_manager()),
|
|
]
|
|
))
|
|
|
|
old_model = project_state.apps.get_model('migrations', 'tag')
|
|
|
|
new_state = project_state.clone()
|
|
operation = RemoveField("tag", "hidden")
|
|
operation.state_forwards("migrations", new_state)
|
|
|
|
new_model = new_state.apps.get_model('migrations', 'tag')
|
|
|
|
self.assertIsNot(old_model, new_model)
|
|
self.assertIs(old_model, old_model.food_mgr.model)
|
|
self.assertIs(old_model, old_model.food_qs.model)
|
|
self.assertIs(new_model, new_model.food_mgr.model)
|
|
self.assertIs(new_model, new_model.food_qs.model)
|
|
self.assertIsNot(old_model.food_mgr, new_model.food_mgr)
|
|
self.assertIsNot(old_model.food_qs, new_model.food_qs)
|
|
self.assertIsNot(old_model.food_mgr.model, new_model.food_mgr.model)
|
|
self.assertIsNot(old_model.food_qs.model, new_model.food_qs.model)
|
|
|
|
|
|
class ModelStateTests(TestCase):
|
|
def test_custom_model_base(self):
|
|
state = ModelState.from_model(ModelWithCustomBase)
|
|
self.assertEqual(state.bases, (models.Model,))
|
|
|
|
def test_bound_field_sanity_check(self):
|
|
field = models.CharField(max_length=1)
|
|
field.model = models.Model
|
|
with self.assertRaisesMessage(ValueError,
|
|
'ModelState.fields cannot be bound to a model - "field" is.'):
|
|
ModelState('app', 'Model', [('field', field)])
|
|
|
|
def test_fields_immutability(self):
|
|
"""
|
|
Tests that rendering a model state doesn't alter its internal fields.
|
|
"""
|
|
apps = Apps()
|
|
field = models.CharField(max_length=1)
|
|
state = ModelState('app', 'Model', [('name', field)])
|
|
Model = state.render(apps)
|
|
self.assertNotEqual(Model._meta.get_field('name'), field)
|
|
|
|
def test_repr(self):
|
|
field = models.CharField(max_length=1)
|
|
state = ModelState('app', 'Model', [('name', field)], bases=['app.A', 'app.B', 'app.C'])
|
|
self.assertEqual(repr(state), "<ModelState: 'app.Model'>")
|
|
|
|
project_state = ProjectState()
|
|
project_state.add_model(state)
|
|
with self.assertRaisesMessage(InvalidBasesError, "Cannot resolve bases for [<ModelState: 'app.Model'>]"):
|
|
project_state.apps
|