170 lines
7.3 KiB
Python
170 lines
7.3 KiB
Python
from django.db import connection
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from django.db.migrations.executor import MigrationExecutor
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from django.test import override_settings
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from .test_base import MigrationTestBase
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class ExecutorTests(MigrationTestBase):
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"""
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Tests the migration executor (full end-to-end running).
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Bear in mind that if these are failing you should fix the other
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test failures first, as they may be propagating into here.
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"""
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available_apps = ["migrations", "django.contrib.sessions"]
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@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations"})
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def test_run(self):
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"""
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Tests running a simple set of migrations.
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"""
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executor = MigrationExecutor(connection)
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executor.recorder.flush()
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# Let's look at the plan first and make sure it's up to scratch
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plan = executor.migration_plan([("migrations", "0002_second")])
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self.assertEqual(
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plan,
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[
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(executor.loader.graph.nodes["migrations", "0001_initial"], False),
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(executor.loader.graph.nodes["migrations", "0002_second"], False),
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],
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)
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# Were the tables there before?
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self.assertTableNotExists("migrations_author")
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self.assertTableNotExists("migrations_book")
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# Alright, let's try running it
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executor.migrate([("migrations", "0002_second")])
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# Are the tables there now?
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self.assertTableExists("migrations_author")
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self.assertTableExists("migrations_book")
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# Rebuild the graph to reflect the new DB state
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executor.loader.build_graph()
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# Alright, let's undo what we did
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plan = executor.migration_plan([("migrations", None)])
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self.assertEqual(
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plan,
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[
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(executor.loader.graph.nodes["migrations", "0002_second"], True),
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(executor.loader.graph.nodes["migrations", "0001_initial"], True),
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],
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)
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executor.migrate([("migrations", None)])
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# Are the tables gone?
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self.assertTableNotExists("migrations_author")
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self.assertTableNotExists("migrations_book")
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@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations_squashed"})
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def test_run_with_squashed(self):
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"""
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Tests running a squashed migration from zero (should ignore what it replaces)
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"""
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executor = MigrationExecutor(connection)
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executor.recorder.flush()
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# Check our leaf node is the squashed one
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leaves = [key for key in executor.loader.graph.leaf_nodes() if key[0] == "migrations"]
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self.assertEqual(leaves, [("migrations", "0001_squashed_0002")])
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# Check the plan
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plan = executor.migration_plan([("migrations", "0001_squashed_0002")])
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self.assertEqual(
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plan,
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[
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(executor.loader.graph.nodes["migrations", "0001_squashed_0002"], False),
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],
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)
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# Were the tables there before?
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self.assertTableNotExists("migrations_author")
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self.assertTableNotExists("migrations_book")
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# Alright, let's try running it
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executor.migrate([("migrations", "0001_squashed_0002")])
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# Are the tables there now?
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self.assertTableExists("migrations_author")
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self.assertTableExists("migrations_book")
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# Rebuild the graph to reflect the new DB state
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executor.loader.build_graph()
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# Alright, let's undo what we did. Should also just use squashed.
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plan = executor.migration_plan([("migrations", None)])
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self.assertEqual(
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plan,
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[
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(executor.loader.graph.nodes["migrations", "0001_squashed_0002"], True),
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],
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)
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executor.migrate([("migrations", None)])
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# Are the tables gone?
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self.assertTableNotExists("migrations_author")
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self.assertTableNotExists("migrations_book")
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@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations", "sessions": "migrations.test_migrations_2"})
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def test_empty_plan(self):
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"""
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Tests that re-planning a full migration of a fully-migrated set doesn't
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perform spurious unmigrations and remigrations.
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There was previously a bug where the executor just always performed the
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backwards plan for applied migrations - which even for the most recent
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migration in an app, might include other, dependent apps, and these
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were being unmigrated.
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"""
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# Make the initial plan, check it
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# We use 'sessions' here as the second app as it's always present
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# in INSTALLED_APPS, so we can happily assign it test migrations.
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executor = MigrationExecutor(connection)
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plan = executor.migration_plan([("migrations", "0002_second"), ("sessions", "0001_initial")])
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self.assertEqual(
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plan,
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[
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(executor.loader.graph.nodes["migrations", "0001_initial"], False),
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(executor.loader.graph.nodes["migrations", "0002_second"], False),
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(executor.loader.graph.nodes["sessions", "0001_initial"], False),
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],
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)
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# Fake-apply all migrations
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executor.migrate([("migrations", "0002_second"), ("sessions", "0001_initial")], fake=True)
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# Rebuild the graph to reflect the new DB state
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executor.loader.build_graph()
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# Now plan a second time and make sure it's empty
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plan = executor.migration_plan([("migrations", "0002_second"), ("sessions", "0001_initial")])
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self.assertEqual(plan, [])
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# Erase all the fake records
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executor.recorder.flush()
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@override_settings(MIGRATION_MODULES={"migrations": "migrations.test_migrations"})
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def test_soft_apply(self):
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"""
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Tests detection of initial migrations already having been applied.
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"""
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state = {"faked": None}
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def fake_storer(phase, migration, fake):
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state["faked"] = fake
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executor = MigrationExecutor(connection, progress_callback=fake_storer)
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executor.recorder.flush()
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# Were the tables there before?
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self.assertTableNotExists("migrations_author")
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self.assertTableNotExists("migrations_tribble")
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# Run it normally
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executor.migrate([("migrations", "0001_initial")])
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# Are the tables there now?
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self.assertTableExists("migrations_author")
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self.assertTableExists("migrations_tribble")
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# We shouldn't have faked that one
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self.assertEqual(state["faked"], False)
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# Rebuild the graph to reflect the new DB state
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executor.loader.build_graph()
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# Fake-reverse that
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executor.migrate([("migrations", None)], fake=True)
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# Are the tables still there?
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self.assertTableExists("migrations_author")
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self.assertTableExists("migrations_tribble")
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# Make sure that was faked
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self.assertEqual(state["faked"], True)
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# Finally, migrate forwards; this should fake-apply our initial migration
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executor.migrate([("migrations", "0001_initial")])
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self.assertEqual(state["faked"], True)
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# And migrate back to clean up the database
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executor.migrate([("migrations", None)])
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self.assertTableNotExists("migrations_author")
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self.assertTableNotExists("migrations_tribble")
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