381 lines
13 KiB
Python
381 lines
13 KiB
Python
from __future__ import absolute_import
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import copy
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import datetime
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from django.test import TestCase
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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
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from django.db.models.loading import cache
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from .models import Author, Book, AuthorWithM2M, Tag, UniqueTest
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class SchemaTests(TestCase):
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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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models = [Author, Book, AuthorWithM2M, Tag, UniqueTest]
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# Utility functions
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def setUp(self):
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# Make sure we're in manual transaction mode
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connection.commit_unless_managed()
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connection.enter_transaction_management()
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connection.managed(True)
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# The unmanaged models need to be removed after the test in order to
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# prevent bad interactions with the flush operation in other tests.
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self.old_app_models = copy.deepcopy(cache.app_models)
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self.old_app_store = copy.deepcopy(cache.app_store)
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for model in self.models:
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model._meta.managed = True
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def tearDown(self):
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# Rollback anything that may have happened
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connection.rollback()
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# Delete any tables made for our models
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cursor = connection.cursor()
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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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try:
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cursor.execute("DROP TABLE %s CASCADE" % (
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connection.ops.quote_name(field.rel.through._meta.db_table),
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))
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except DatabaseError:
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connection.rollback()
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else:
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connection.commit()
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# Then remove the main tables
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try:
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cursor.execute("DROP TABLE %s CASCADE" % (
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connection.ops.quote_name(model._meta.db_table),
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))
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except DatabaseError:
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connection.rollback()
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else:
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connection.commit()
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# Unhook our models
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for model in self.models:
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model._meta.managed = False
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cache.app_models = self.old_app_models
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cache.app_store = self.old_app_store
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cache._get_models_cache = {}
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def column_classes(self, model):
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cursor = connection.cursor()
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return 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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# 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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editor = connection.schema_editor()
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editor.start()
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editor.create_model(Author)
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editor.commit()
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# Check that it's there
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try:
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list(Author.objects.all())
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except DatabaseError, e:
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self.fail("Table not created: %s" % e)
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# Clean up that table
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editor.start()
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editor.delete_model(Author)
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editor.commit()
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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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def test_creation_fk(self):
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"Tests that creating tables out of FK order works"
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# Create the table
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editor = connection.schema_editor()
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editor.start()
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editor.create_model(Book)
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editor.create_model(Author)
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editor.commit()
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# Check that both tables are there
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try:
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list(Author.objects.all())
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except DatabaseError, e:
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self.fail("Author table not created: %s" % e)
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try:
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list(Book.objects.all())
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except DatabaseError, e:
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self.fail("Book table not created: %s" % e)
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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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connection.commit()
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def test_create_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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editor = connection.schema_editor()
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editor.start()
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editor.create_model(Author)
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editor.commit()
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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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editor = connection.schema_editor()
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editor.start()
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editor.create_field(
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Author,
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new_field,
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)
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editor.commit()
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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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editor = connection.schema_editor()
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editor.start()
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editor.create_model(Author)
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editor.commit()
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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(columns['name'][1][6], False)
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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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editor = connection.schema_editor()
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editor.start()
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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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)
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editor.commit()
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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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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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editor = connection.schema_editor()
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editor.start()
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editor.create_model(Author)
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editor.commit()
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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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editor = connection.schema_editor()
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editor.start()
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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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)
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editor.commit()
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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(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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editor = connection.schema_editor()
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editor.start()
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editor.create_model(AuthorWithM2M)
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editor.create_model(Tag)
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editor.commit()
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# Create an M2M field
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new_field = ManyToManyField("schema.Tag", related_name="authors")
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new_field.contribute_to_class(AuthorWithM2M, "tags")
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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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connection.rollback()
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# Add the field
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editor = connection.schema_editor()
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editor.start()
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editor.create_field(
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Author,
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new_field,
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)
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editor.commit()
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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['tag_id'][0], "IntegerField")
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# Remove the M2M table again
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editor = connection.schema_editor()
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editor.start()
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editor.delete_field(
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Author,
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new_field,
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)
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editor.commit()
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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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connection.rollback()
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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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editor = connection.schema_editor()
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editor.start()
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editor.create_model(Tag)
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editor.commit()
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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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connection.rollback()
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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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editor = connection.schema_editor()
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editor.start()
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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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)
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editor.commit()
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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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connection.rollback()
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# Alter the slug field to be non-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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editor = connection.schema_editor()
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editor.start()
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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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)
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editor.commit()
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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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connection.rollback()
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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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editor = connection.schema_editor()
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editor.start()
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editor.create_model(UniqueTest)
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editor.commit()
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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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connection.rollback()
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# Alter the model to it's non-unique-together companion
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editor = connection.schema_editor()
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editor.start()
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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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editor.commit()
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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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connection.rollback()
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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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editor = connection.schema_editor()
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editor.start()
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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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editor.commit()
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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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connection.rollback()
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def test_db_table(self):
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"""
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Tests renaming of the table
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"""
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# Create the table
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editor = connection.schema_editor()
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editor.start()
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editor.create_model(Author)
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editor.commit()
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# Ensure the table is there 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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# Alter the table
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editor = connection.schema_editor()
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editor.start()
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editor.alter_db_table(
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Author,
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"schema_author",
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"schema_otherauthor",
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)
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editor.commit()
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# Ensure the table is there afterwards
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Author._meta.db_table = "schema_otherauthor"
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columns = self.column_classes(Author)
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self.assertEqual(columns['name'][0], "CharField")
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# Alter the table again
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editor = connection.schema_editor()
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editor.start()
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editor.alter_db_table(
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Author,
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"schema_otherauthor",
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"schema_author",
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)
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editor.commit()
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# Ensure the table is still there
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Author._meta.db_table = "schema_author"
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columns = self.column_classes(Author)
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self.assertEqual(columns['name'][0], "CharField")
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