103 lines
3.4 KiB
Python
103 lines
3.4 KiB
Python
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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.models.loading import cache
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from django.db import connection, DatabaseError, IntegrityError
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from .models import Author, Book
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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]
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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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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 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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