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651 lines
26 KiB
Python
651 lines
26 KiB
Python
from __future__ import absolute_import
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import datetime
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from django.test import TransactionTestCase
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from django.utils.unittest import skipUnless
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from django.db import connection, DatabaseError, IntegrityError
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from django.db.models.fields import IntegerField, TextField, CharField, SlugField
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from django.db.models.fields.related import ManyToManyField, ForeignKey
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from django.db.transaction import atomic
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from .models import Author, AuthorWithM2M, Book, BookWithSlug, BookWithM2M, Tag, TagIndexed, TagM2MTest, TagUniqueRename, UniqueTest
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class SchemaTests(TransactionTestCase):
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"""
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Tests that the schema-alteration code works correctly.
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Be aware that these tests are more liable than most to false results,
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as sometimes the code to check if a test has worked is almost as complex
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as the code it is testing.
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"""
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available_apps = []
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models = [Author, AuthorWithM2M, Book, BookWithSlug, BookWithM2M, Tag, TagIndexed, TagM2MTest, TagUniqueRename, UniqueTest]
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no_table_strings = ["no such table", "unknown table", "does not exist"]
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# Utility functions
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def tearDown(self):
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# Delete any tables made for our models
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self.delete_tables()
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def delete_tables(self):
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"Deletes all model tables for our models for a clean test environment"
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cursor = connection.cursor()
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connection.disable_constraint_checking()
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for model in self.models:
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# Remove any M2M tables first
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for field in model._meta.local_many_to_many:
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with atomic():
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try:
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cursor.execute(connection.schema_editor().sql_delete_table % {
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"table": connection.ops.quote_name(field.rel.through._meta.db_table),
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})
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except DatabaseError as e:
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if any([s in str(e).lower() for s in self.no_table_strings]):
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pass
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else:
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raise
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# Then remove the main tables
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with atomic():
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try:
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cursor.execute(connection.schema_editor().sql_delete_table % {
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"table": connection.ops.quote_name(model._meta.db_table),
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})
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except DatabaseError as e:
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if any([s in str(e).lower() for s in self.no_table_strings]):
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pass
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else:
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raise
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connection.enable_constraint_checking()
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def column_classes(self, model):
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cursor = connection.cursor()
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columns = dict(
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(d[0], (connection.introspection.get_field_type(d[1], d), d))
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for d in connection.introspection.get_table_description(
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cursor,
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model._meta.db_table,
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)
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)
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# SQLite has a different format for field_type
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for name, (type, desc) in columns.items():
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if isinstance(type, tuple):
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columns[name] = (type[0], desc)
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# SQLite also doesn't error properly
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if not columns:
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raise DatabaseError("Table does not exist (empty pragma)")
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return columns
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# Tests
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def test_creation_deletion(self):
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"""
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Tries creating a model's table, and then deleting it.
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"""
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# Create the table
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with connection.schema_editor() as editor:
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editor.create_model(Author)
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# Check that it's there
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list(Author.objects.all())
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# Clean up that table
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with connection.schema_editor() as editor:
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editor.delete_model(Author)
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# Check that it's gone
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self.assertRaises(
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DatabaseError,
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lambda: list(Author.objects.all()),
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)
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@skipUnless(connection.features.supports_foreign_keys, "No FK support")
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def test_fk(self):
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"Tests that creating tables out of FK order, then repointing, works"
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# Create the table
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with connection.schema_editor() as editor:
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editor.create_model(Book)
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editor.create_model(Author)
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editor.create_model(Tag)
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# Check that initial tables are there
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list(Author.objects.all())
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list(Book.objects.all())
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# Make sure the FK constraint is present
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with self.assertRaises(IntegrityError):
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Book.objects.create(
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author_id = 1,
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title = "Much Ado About Foreign Keys",
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pub_date = datetime.datetime.now(),
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)
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# Repoint the FK constraint
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new_field = ForeignKey(Tag)
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new_field.set_attributes_from_name("author")
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with connection.schema_editor() as editor:
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editor.alter_field(
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Book,
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Book._meta.get_field_by_name("author")[0],
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new_field,
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strict=True,
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)
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# Make sure the new FK constraint is present
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constraints = connection.introspection.get_constraints(connection.cursor(), Book._meta.db_table)
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for name, details in constraints.items():
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if details['columns'] == ["author_id"] and details['foreign_key']:
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self.assertEqual(details['foreign_key'], ('schema_tag', 'id'))
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break
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else:
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self.fail("No FK constraint for author_id found")
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def test_add_field(self):
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"""
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Tests adding fields to models
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"""
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# Create the table
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with connection.schema_editor() as editor:
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editor.create_model(Author)
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# Ensure there's no age field
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columns = self.column_classes(Author)
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self.assertNotIn("age", columns)
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# Alter the name field to a TextField
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new_field = IntegerField(null=True)
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new_field.set_attributes_from_name("age")
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with connection.schema_editor() as editor:
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editor.add_field(
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Author,
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new_field,
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)
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# Ensure the field is right afterwards
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columns = self.column_classes(Author)
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self.assertEqual(columns['age'][0], "IntegerField")
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self.assertEqual(columns['age'][1][6], True)
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def test_alter(self):
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"""
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Tests simple altering of fields
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"""
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# Create the table
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with connection.schema_editor() as editor:
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editor.create_model(Author)
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# Ensure the field is right to begin with
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columns = self.column_classes(Author)
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self.assertEqual(columns['name'][0], "CharField")
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self.assertEqual(bool(columns['name'][1][6]), bool(connection.features.interprets_empty_strings_as_nulls))
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# Alter the name field to a TextField
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new_field = TextField(null=True)
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new_field.set_attributes_from_name("name")
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with connection.schema_editor() as editor:
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editor.alter_field(
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Author,
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Author._meta.get_field_by_name("name")[0],
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new_field,
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strict=True,
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)
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# Ensure the field is right afterwards
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columns = self.column_classes(Author)
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self.assertEqual(columns['name'][0], "TextField")
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self.assertEqual(columns['name'][1][6], True)
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# Change nullability again
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new_field2 = TextField(null=False)
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new_field2.set_attributes_from_name("name")
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with connection.schema_editor() as editor:
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editor.alter_field(
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Author,
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new_field,
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new_field2,
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strict=True,
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)
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# Ensure the field is right afterwards
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columns = self.column_classes(Author)
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self.assertEqual(columns['name'][0], "TextField")
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self.assertEqual(bool(columns['name'][1][6]), False)
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def test_rename(self):
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"""
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Tests simple altering of fields
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"""
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# Create the table
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with connection.schema_editor() as editor:
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editor.create_model(Author)
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# Ensure the field is right to begin with
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columns = self.column_classes(Author)
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self.assertEqual(columns['name'][0], "CharField")
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self.assertNotIn("display_name", columns)
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# Alter the name field's name
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new_field = CharField(max_length=254)
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new_field.set_attributes_from_name("display_name")
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with connection.schema_editor() as editor:
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editor.alter_field(
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Author,
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Author._meta.get_field_by_name("name")[0],
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new_field,
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strict = True,
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)
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# Ensure the field is right afterwards
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columns = self.column_classes(Author)
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self.assertEqual(columns['display_name'][0], "CharField")
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self.assertNotIn("name", columns)
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def test_m2m_create(self):
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"""
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Tests M2M fields on models during creation
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"""
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# Create the tables
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with connection.schema_editor() as editor:
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editor.create_model(Author)
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editor.create_model(TagM2MTest)
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editor.create_model(BookWithM2M)
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# Ensure there is now an m2m table there
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columns = self.column_classes(BookWithM2M._meta.get_field_by_name("tags")[0].rel.through)
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self.assertEqual(columns['tagm2mtest_id'][0], "IntegerField")
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def test_m2m(self):
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"""
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Tests adding/removing M2M fields on models
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"""
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# Create the tables
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with connection.schema_editor() as editor:
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editor.create_model(AuthorWithM2M)
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editor.create_model(TagM2MTest)
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# Create an M2M field
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new_field = ManyToManyField("schema.TagM2MTest", related_name="authors")
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new_field.contribute_to_class(AuthorWithM2M, "tags")
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try:
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# Ensure there's no m2m table there
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self.assertRaises(DatabaseError, self.column_classes, new_field.rel.through)
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# Add the field
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with connection.schema_editor() as editor:
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editor.add_field(
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Author,
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new_field,
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)
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# Ensure there is now an m2m table there
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columns = self.column_classes(new_field.rel.through)
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self.assertEqual(columns['tagm2mtest_id'][0], "IntegerField")
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# Remove the M2M table again
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with connection.schema_editor() as editor:
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editor.remove_field(
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Author,
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new_field,
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)
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# Ensure there's no m2m table there
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self.assertRaises(DatabaseError, self.column_classes, new_field.rel.through)
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finally:
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# Cleanup model states
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AuthorWithM2M._meta.local_many_to_many.remove(new_field)
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def test_m2m_repoint(self):
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"""
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Tests repointing M2M fields
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"""
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# Create the tables
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with connection.schema_editor() as editor:
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editor.create_model(Author)
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editor.create_model(BookWithM2M)
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editor.create_model(TagM2MTest)
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editor.create_model(UniqueTest)
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# Ensure the M2M exists and points to TagM2MTest
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constraints = connection.introspection.get_constraints(connection.cursor(), BookWithM2M._meta.get_field_by_name("tags")[0].rel.through._meta.db_table)
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if connection.features.supports_foreign_keys:
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for name, details in constraints.items():
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if details['columns'] == ["tagm2mtest_id"] and details['foreign_key']:
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self.assertEqual(details['foreign_key'], ('schema_tagm2mtest', 'id'))
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break
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else:
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self.fail("No FK constraint for tagm2mtest_id found")
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# Repoint the M2M
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new_field = ManyToManyField(UniqueTest)
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new_field.contribute_to_class(BookWithM2M, "uniques")
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try:
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with connection.schema_editor() as editor:
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editor.alter_field(
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Author,
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BookWithM2M._meta.get_field_by_name("tags")[0],
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new_field,
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)
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# Ensure old M2M is gone
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self.assertRaises(DatabaseError, self.column_classes, BookWithM2M._meta.get_field_by_name("tags")[0].rel.through)
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# Ensure the new M2M exists and points to UniqueTest
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constraints = connection.introspection.get_constraints(connection.cursor(), new_field.rel.through._meta.db_table)
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if connection.features.supports_foreign_keys:
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for name, details in constraints.items():
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if details['columns'] == ["uniquetest_id"] and details['foreign_key']:
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self.assertEqual(details['foreign_key'], ('schema_uniquetest', 'id'))
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break
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else:
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self.fail("No FK constraint for uniquetest_id found")
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finally:
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# Cleanup model states
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BookWithM2M._meta.local_many_to_many.remove(new_field)
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del BookWithM2M._meta._m2m_cache
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@skipUnless(connection.features.supports_check_constraints, "No check constraints")
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def test_check_constraints(self):
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"""
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Tests creating/deleting CHECK constraints
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"""
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# Create the tables
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with connection.schema_editor() as editor:
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editor.create_model(Author)
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# Ensure the constraint exists
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constraints = connection.introspection.get_constraints(connection.cursor(), Author._meta.db_table)
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for name, details in constraints.items():
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if details['columns'] == ["height"] and details['check']:
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break
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else:
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self.fail("No check constraint for height found")
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# Alter the column to remove it
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new_field = IntegerField(null=True, blank=True)
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new_field.set_attributes_from_name("height")
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with connection.schema_editor() as editor:
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editor.alter_field(
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Author,
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Author._meta.get_field_by_name("height")[0],
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new_field,
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strict = True,
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)
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constraints = connection.introspection.get_constraints(connection.cursor(), Author._meta.db_table)
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for name, details in constraints.items():
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if details['columns'] == ["height"] and details['check']:
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self.fail("Check constraint for height found")
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# Alter the column to re-add it
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with connection.schema_editor() as editor:
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editor.alter_field(
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Author,
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new_field,
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Author._meta.get_field_by_name("height")[0],
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strict = True,
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)
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constraints = connection.introspection.get_constraints(connection.cursor(), Author._meta.db_table)
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for name, details in constraints.items():
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if details['columns'] == ["height"] and details['check']:
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break
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else:
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self.fail("No check constraint for height found")
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def test_unique(self):
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"""
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Tests removing and adding unique constraints to a single column.
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"""
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# Create the table
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with connection.schema_editor() as editor:
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editor.create_model(Tag)
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# Ensure the field is unique to begin with
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Tag.objects.create(title="foo", slug="foo")
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self.assertRaises(IntegrityError, Tag.objects.create, title="bar", slug="foo")
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Tag.objects.all().delete()
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# Alter the slug field to be non-unique
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new_field = SlugField(unique=False)
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new_field.set_attributes_from_name("slug")
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with connection.schema_editor() as editor:
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editor.alter_field(
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Tag,
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Tag._meta.get_field_by_name("slug")[0],
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new_field,
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strict = True,
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)
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# Ensure the field is no longer unique
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Tag.objects.create(title="foo", slug="foo")
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Tag.objects.create(title="bar", slug="foo")
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Tag.objects.all().delete()
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# Alter the slug field to be unique
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new_new_field = SlugField(unique=True)
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new_new_field.set_attributes_from_name("slug")
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with connection.schema_editor() as editor:
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editor.alter_field(
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Tag,
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new_field,
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new_new_field,
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strict = True,
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)
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# Ensure the field is unique again
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Tag.objects.create(title="foo", slug="foo")
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self.assertRaises(IntegrityError, Tag.objects.create, title="bar", slug="foo")
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Tag.objects.all().delete()
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# Rename the field
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new_field = SlugField(unique=False)
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new_field.set_attributes_from_name("slug2")
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with connection.schema_editor() as editor:
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editor.alter_field(
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Tag,
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Tag._meta.get_field_by_name("slug")[0],
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TagUniqueRename._meta.get_field_by_name("slug2")[0],
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strict = True,
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)
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# Ensure the field is still unique
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TagUniqueRename.objects.create(title="foo", slug2="foo")
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self.assertRaises(IntegrityError, TagUniqueRename.objects.create, title="bar", slug2="foo")
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Tag.objects.all().delete()
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def test_unique_together(self):
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"""
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Tests removing and adding unique_together constraints on a model.
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"""
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# Create the table
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with connection.schema_editor() as editor:
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editor.create_model(UniqueTest)
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# Ensure the fields are unique to begin with
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UniqueTest.objects.create(year=2012, slug="foo")
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UniqueTest.objects.create(year=2011, slug="foo")
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UniqueTest.objects.create(year=2011, slug="bar")
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self.assertRaises(IntegrityError, UniqueTest.objects.create, year=2012, slug="foo")
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UniqueTest.objects.all().delete()
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# Alter the model to it's non-unique-together companion
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with connection.schema_editor() as editor:
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editor.alter_unique_together(
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UniqueTest,
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UniqueTest._meta.unique_together,
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[],
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)
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# Ensure the fields are no longer unique
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UniqueTest.objects.create(year=2012, slug="foo")
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UniqueTest.objects.create(year=2012, slug="foo")
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UniqueTest.objects.all().delete()
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# Alter it back
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new_new_field = SlugField(unique=True)
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new_new_field.set_attributes_from_name("slug")
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with connection.schema_editor() as editor:
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editor.alter_unique_together(
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UniqueTest,
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[],
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UniqueTest._meta.unique_together,
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)
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# Ensure the fields are unique again
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UniqueTest.objects.create(year=2012, slug="foo")
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self.assertRaises(IntegrityError, UniqueTest.objects.create, year=2012, slug="foo")
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UniqueTest.objects.all().delete()
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def test_index_together(self):
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"""
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Tests removing and adding index_together constraints on a model.
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"""
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# Create the table
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with connection.schema_editor() as editor:
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editor.create_model(Tag)
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# Ensure there's no index on the year/slug columns first
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self.assertEqual(
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False,
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any(
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c["index"]
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for c in connection.introspection.get_constraints(connection.cursor(), "schema_tag").values()
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if c['columns'] == ["slug", "title"]
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),
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)
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# Alter the model to add an index
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with connection.schema_editor() as editor:
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editor.alter_index_together(
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Tag,
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[],
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[("slug", "title")],
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)
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# Ensure there is now an index
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self.assertEqual(
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True,
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any(
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c["index"]
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for c in connection.introspection.get_constraints(connection.cursor(), "schema_tag").values()
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if c['columns'] == ["slug", "title"]
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),
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)
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|
# Alter it back
|
|
new_new_field = SlugField(unique=True)
|
|
new_new_field.set_attributes_from_name("slug")
|
|
with connection.schema_editor() as editor:
|
|
editor.alter_index_together(
|
|
Tag,
|
|
[("slug", "title")],
|
|
[],
|
|
)
|
|
# Ensure there's no index
|
|
self.assertEqual(
|
|
False,
|
|
any(
|
|
c["index"]
|
|
for c in connection.introspection.get_constraints(connection.cursor(), "schema_tag").values()
|
|
if c['columns'] == ["slug", "title"]
|
|
),
|
|
)
|
|
|
|
def test_create_index_together(self):
|
|
"""
|
|
Tests creating models with index_together already defined
|
|
"""
|
|
# Create the table
|
|
with connection.schema_editor() as editor:
|
|
editor.create_model(TagIndexed)
|
|
# Ensure there is an index
|
|
self.assertEqual(
|
|
True,
|
|
any(
|
|
c["index"]
|
|
for c in connection.introspection.get_constraints(connection.cursor(), "schema_tagindexed").values()
|
|
if c['columns'] == ["slug", "title"]
|
|
),
|
|
)
|
|
|
|
def test_db_table(self):
|
|
"""
|
|
Tests renaming of the table
|
|
"""
|
|
# Create the table
|
|
with connection.schema_editor() as editor:
|
|
editor.create_model(Author)
|
|
# Ensure the table is there to begin with
|
|
columns = self.column_classes(Author)
|
|
self.assertEqual(columns['name'][0], "CharField")
|
|
# Alter the table
|
|
with connection.schema_editor() as editor:
|
|
editor.alter_db_table(
|
|
Author,
|
|
"schema_author",
|
|
"schema_otherauthor",
|
|
)
|
|
# Ensure the table is there afterwards
|
|
Author._meta.db_table = "schema_otherauthor"
|
|
columns = self.column_classes(Author)
|
|
self.assertEqual(columns['name'][0], "CharField")
|
|
# Alter the table again
|
|
with connection.schema_editor() as editor:
|
|
editor.alter_db_table(
|
|
Author,
|
|
"schema_otherauthor",
|
|
"schema_author",
|
|
)
|
|
# Ensure the table is still there
|
|
Author._meta.db_table = "schema_author"
|
|
columns = self.column_classes(Author)
|
|
self.assertEqual(columns['name'][0], "CharField")
|
|
|
|
def test_indexes(self):
|
|
"""
|
|
Tests creation/altering of indexes
|
|
"""
|
|
# Create the table
|
|
with connection.schema_editor() as editor:
|
|
editor.create_model(Author)
|
|
editor.create_model(Book)
|
|
# Ensure the table is there and has the right index
|
|
self.assertIn(
|
|
"title",
|
|
connection.introspection.get_indexes(connection.cursor(), Book._meta.db_table),
|
|
)
|
|
# Alter to remove the index
|
|
new_field = CharField(max_length=100, db_index=False)
|
|
new_field.set_attributes_from_name("title")
|
|
with connection.schema_editor() as editor:
|
|
editor.alter_field(
|
|
Book,
|
|
Book._meta.get_field_by_name("title")[0],
|
|
new_field,
|
|
strict = True,
|
|
)
|
|
# Ensure the table is there and has no index
|
|
self.assertNotIn(
|
|
"title",
|
|
connection.introspection.get_indexes(connection.cursor(), Book._meta.db_table),
|
|
)
|
|
# Alter to re-add the index
|
|
with connection.schema_editor() as editor:
|
|
editor.alter_field(
|
|
Book,
|
|
new_field,
|
|
Book._meta.get_field_by_name("title")[0],
|
|
strict = True,
|
|
)
|
|
# Ensure the table is there and has the index again
|
|
self.assertIn(
|
|
"title",
|
|
connection.introspection.get_indexes(connection.cursor(), Book._meta.db_table),
|
|
)
|
|
# Add a unique column, verify that creates an implicit index
|
|
with connection.schema_editor() as editor:
|
|
editor.add_field(
|
|
Book,
|
|
BookWithSlug._meta.get_field_by_name("slug")[0],
|
|
)
|
|
self.assertIn(
|
|
"slug",
|
|
connection.introspection.get_indexes(connection.cursor(), Book._meta.db_table),
|
|
)
|
|
# Remove the unique, check the index goes with it
|
|
new_field2 = CharField(max_length=20, unique=False)
|
|
new_field2.set_attributes_from_name("slug")
|
|
with connection.schema_editor() as editor:
|
|
editor.alter_field(
|
|
BookWithSlug,
|
|
BookWithSlug._meta.get_field_by_name("slug")[0],
|
|
new_field2,
|
|
strict = True,
|
|
)
|
|
self.assertNotIn(
|
|
"slug",
|
|
connection.introspection.get_indexes(connection.cursor(), Book._meta.db_table),
|
|
)
|
|
|
|
def test_primary_key(self):
|
|
"""
|
|
Tests altering of the primary key
|
|
"""
|
|
# Create the table
|
|
with connection.schema_editor() as editor:
|
|
editor.create_model(Tag)
|
|
# Ensure the table is there and has the right PK
|
|
self.assertTrue(
|
|
connection.introspection.get_indexes(connection.cursor(), Tag._meta.db_table)['id']['primary_key'],
|
|
)
|
|
# Alter to change the PK
|
|
new_field = SlugField(primary_key=True)
|
|
new_field.set_attributes_from_name("slug")
|
|
with connection.schema_editor() as editor:
|
|
editor.remove_field(Tag, Tag._meta.get_field_by_name("id")[0])
|
|
editor.alter_field(
|
|
Tag,
|
|
Tag._meta.get_field_by_name("slug")[0],
|
|
new_field,
|
|
)
|
|
# Ensure the PK changed
|
|
self.assertNotIn(
|
|
'id',
|
|
connection.introspection.get_indexes(connection.cursor(), Tag._meta.db_table),
|
|
)
|
|
self.assertTrue(
|
|
connection.introspection.get_indexes(connection.cursor(), Tag._meta.db_table)['slug']['primary_key'],
|
|
)
|