mirror of
https://github.com/django/django.git
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388 lines
14 KiB
Python
388 lines
14 KiB
Python
# -*- coding: utf-8 -*-
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from django.test import TestCase
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from django.db.migrations.optimizer import MigrationOptimizer
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from django.db import migrations
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from django.db import models
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class OptimizerTests(TestCase):
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"""
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Tests the migration autodetector.
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"""
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def optimize(self, operations):
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"""
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Handy shortcut for getting results + number of loops
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"""
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optimizer = MigrationOptimizer()
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return optimizer.optimize(operations), optimizer._iterations
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def assertOptimizesTo(self, operations, expected, exact=None, less_than=None):
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result, iterations = self.optimize(operations)
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self.assertEqual(expected, result)
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if exact is not None and iterations != exact:
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raise self.failureException("Optimization did not take exactly %s iterations (it took %s)" % (exact, iterations))
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if less_than is not None and iterations >= less_than:
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raise self.failureException("Optimization did not take less than %s iterations (it took %s)" % (less_than, iterations))
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def test_operation_equality(self):
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"""
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Tests the equality operator on lists of operations.
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If this is broken, then the optimizer will get stuck in an
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infinite loop, so it's kind of important.
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"""
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self.assertEqual(
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[migrations.DeleteModel("Test")],
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[migrations.DeleteModel("Test")],
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)
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self.assertEqual(
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[migrations.CreateModel("Test", [("name", models.CharField(max_length=255))])],
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[migrations.CreateModel("Test", [("name", models.CharField(max_length=255))])],
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)
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self.assertNotEqual(
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[migrations.CreateModel("Test", [("name", models.CharField(max_length=255))])],
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[migrations.CreateModel("Test", [("name", models.CharField(max_length=100))])],
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)
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self.assertEqual(
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[migrations.AddField("Test", "name", models.CharField(max_length=255))],
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[migrations.AddField("Test", "name", models.CharField(max_length=255))],
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)
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self.assertNotEqual(
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[migrations.AddField("Test", "name", models.CharField(max_length=255))],
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[migrations.AddField("Test", "name", models.CharField(max_length=100))],
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)
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self.assertNotEqual(
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[migrations.AddField("Test", "name", models.CharField(max_length=255))],
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[migrations.AlterField("Test", "name", models.CharField(max_length=255))],
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)
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def test_single(self):
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"""
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Tests that the optimizer does nothing on a single operation,
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and that it does it in just one pass.
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"""
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self.assertOptimizesTo(
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[migrations.DeleteModel("Foo")],
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[migrations.DeleteModel("Foo")],
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exact=1,
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)
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def test_create_delete_model(self):
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"""
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CreateModel and DeleteModel should collapse into nothing.
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"""
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self.assertOptimizesTo(
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[
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migrations.CreateModel("Foo", [("name", models.CharField(max_length=255))]),
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migrations.DeleteModel("Foo"),
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],
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[],
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)
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def test_create_rename_model(self):
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"""
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CreateModel should absorb RenameModels.
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"""
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self.assertOptimizesTo(
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[
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migrations.CreateModel("Foo", [("name", models.CharField(max_length=255))]),
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migrations.RenameModel("Foo", "Bar"),
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],
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[
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migrations.CreateModel("Bar", [("name", models.CharField(max_length=255))]),
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],
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)
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def test_rename_model_self(self):
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"""
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RenameModels should absorb themselves.
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"""
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self.assertOptimizesTo(
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[
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migrations.RenameModel("Foo", "Baa"),
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migrations.RenameModel("Baa", "Bar"),
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],
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[
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migrations.RenameModel("Foo", "Bar"),
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],
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)
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def test_create_alter_delete_model(self):
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"""
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CreateModel, AlterModelTable, AlterUniqueTogether, and DeleteModel should collapse into nothing.
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"""
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self.assertOptimizesTo(
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[
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migrations.CreateModel("Foo", [("name", models.CharField(max_length=255))]),
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migrations.AlterModelTable("Foo", "woohoo"),
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migrations.AlterUniqueTogether("Foo", [["a", "b"]]),
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migrations.DeleteModel("Foo"),
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],
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[],
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)
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def test_optimize_through_create(self):
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"""
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We should be able to optimize away create/delete through a create or delete
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of a different model, but only if the create operation does not mention the model
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at all.
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"""
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# These should work
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self.assertOptimizesTo(
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[
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migrations.CreateModel("Foo", [("name", models.CharField(max_length=255))]),
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migrations.CreateModel("Bar", [("size", models.IntegerField())]),
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migrations.DeleteModel("Foo"),
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],
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[
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migrations.CreateModel("Bar", [("size", models.IntegerField())]),
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],
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)
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self.assertOptimizesTo(
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[
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migrations.CreateModel("Foo", [("name", models.CharField(max_length=255))]),
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migrations.CreateModel("Bar", [("size", models.IntegerField())]),
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migrations.DeleteModel("Bar"),
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migrations.DeleteModel("Foo"),
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],
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[],
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)
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self.assertOptimizesTo(
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[
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migrations.CreateModel("Foo", [("name", models.CharField(max_length=255))]),
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migrations.CreateModel("Bar", [("size", models.IntegerField())]),
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migrations.DeleteModel("Foo"),
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migrations.DeleteModel("Bar"),
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],
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[],
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)
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# This should not work - FK should block it
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self.assertOptimizesTo(
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[
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migrations.CreateModel("Foo", [("name", models.CharField(max_length=255))]),
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migrations.CreateModel("Bar", [("other", models.ForeignKey("testapp.Foo"))]),
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migrations.DeleteModel("Foo"),
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],
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[
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migrations.CreateModel("Foo", [("name", models.CharField(max_length=255))]),
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migrations.CreateModel("Bar", [("other", models.ForeignKey("testapp.Foo"))]),
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migrations.DeleteModel("Foo"),
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],
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)
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# This should not work - bases should block it
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self.assertOptimizesTo(
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[
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migrations.CreateModel("Foo", [("name", models.CharField(max_length=255))]),
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migrations.CreateModel("Bar", [("size", models.IntegerField())], bases=("testapp.Foo", )),
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migrations.DeleteModel("Foo"),
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],
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[
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migrations.CreateModel("Foo", [("name", models.CharField(max_length=255))]),
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migrations.CreateModel("Bar", [("size", models.IntegerField())], bases=("testapp.Foo", )),
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migrations.DeleteModel("Foo"),
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],
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)
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def test_create_model_add_field(self):
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"""
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AddField should optimize into CreateModel.
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"""
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self.assertOptimizesTo(
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[
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migrations.CreateModel("Foo", [("name", models.CharField(max_length=255))]),
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migrations.AddField("Foo", "age", models.IntegerField()),
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],
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[
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migrations.CreateModel("Foo", [
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("name", models.CharField(max_length=255)),
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("age", models.IntegerField()),
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]),
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],
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)
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def test_create_model_add_field_not_through_fk(self):
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"""
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AddField should NOT optimize into CreateModel if it's an FK to a model
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that's between them.
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"""
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self.assertOptimizesTo(
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[
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migrations.CreateModel("Foo", [("name", models.CharField(max_length=255))]),
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migrations.CreateModel("Link", [("url", models.TextField())]),
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migrations.AddField("Foo", "link", models.ForeignKey("migrations.Link")),
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],
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[
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migrations.CreateModel("Foo", [("name", models.CharField(max_length=255))]),
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migrations.CreateModel("Link", [("url", models.TextField())]),
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migrations.AddField("Foo", "link", models.ForeignKey("migrations.Link")),
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],
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)
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def test_create_model_add_field_not_through_m2m_through(self):
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"""
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AddField should NOT optimize into CreateModel if it's an M2M using a
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through that's created between them.
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"""
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# Note: The middle model is not actually a valid through model,
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# but that doesn't matter, as we never render it.
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self.assertOptimizesTo(
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[
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migrations.CreateModel("Foo", [("name", models.CharField(max_length=255))]),
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migrations.CreateModel("LinkThrough", []),
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migrations.AddField("Foo", "link", models.ManyToManyField("migrations.Link", through="migrations.LinkThrough")),
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],
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[
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migrations.CreateModel("Foo", [("name", models.CharField(max_length=255))]),
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migrations.CreateModel("LinkThrough", []),
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migrations.AddField("Foo", "link", models.ManyToManyField("migrations.Link", through="migrations.LinkThrough")),
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],
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)
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def test_create_model_alter_field(self):
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"""
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AlterField should optimize into CreateModel.
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"""
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self.assertOptimizesTo(
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[
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migrations.CreateModel("Foo", [("name", models.CharField(max_length=255))]),
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migrations.AlterField("Foo", "name", models.IntegerField()),
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],
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[
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migrations.CreateModel("Foo", [
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("name", models.IntegerField()),
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]),
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],
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)
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def test_create_model_rename_field(self):
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"""
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RenameField should optimize into CreateModel.
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"""
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self.assertOptimizesTo(
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[
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migrations.CreateModel("Foo", [("name", models.CharField(max_length=255))]),
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migrations.RenameField("Foo", "name", "title"),
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],
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[
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migrations.CreateModel("Foo", [
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("title", models.CharField(max_length=255)),
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]),
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],
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)
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def test_add_field_rename_field(self):
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"""
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RenameField should optimize into AddField
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"""
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self.assertOptimizesTo(
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[
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migrations.AddField("Foo", "name", models.CharField(max_length=255)),
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migrations.RenameField("Foo", "name", "title"),
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],
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[
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migrations.AddField("Foo", "title", models.CharField(max_length=255)),
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],
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)
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def test_alter_field_rename_field(self):
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"""
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RenameField should optimize to the other side of AlterField,
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and into itself.
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"""
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self.assertOptimizesTo(
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[
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migrations.AlterField("Foo", "name", models.CharField(max_length=255)),
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migrations.RenameField("Foo", "name", "title"),
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migrations.RenameField("Foo", "title", "nom"),
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],
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[
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migrations.RenameField("Foo", "name", "nom"),
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migrations.AlterField("Foo", "nom", models.CharField(max_length=255)),
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],
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)
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def test_create_model_remove_field(self):
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"""
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RemoveField should optimize into CreateModel.
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"""
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self.assertOptimizesTo(
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[
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migrations.CreateModel("Foo", [
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("name", models.CharField(max_length=255)),
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("age", models.IntegerField()),
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]),
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migrations.RemoveField("Foo", "age"),
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],
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[
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migrations.CreateModel("Foo", [
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("name", models.CharField(max_length=255)),
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]),
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],
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)
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def test_add_field_alter_field(self):
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"""
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AlterField should optimize into AddField.
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"""
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self.assertOptimizesTo(
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[
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migrations.AddField("Foo", "age", models.IntegerField()),
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migrations.AlterField("Foo", "age", models.FloatField(default=2.4)),
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],
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[
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migrations.AddField("Foo", "age", models.FloatField(default=2.4)),
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],
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)
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def test_add_field_delete_field(self):
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"""
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RemoveField should cancel AddField
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"""
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self.assertOptimizesTo(
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[
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migrations.AddField("Foo", "age", models.IntegerField()),
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migrations.RemoveField("Foo", "age"),
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],
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[],
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)
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def test_alter_field_delete_field(self):
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"""
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RemoveField should absorb AlterField
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"""
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self.assertOptimizesTo(
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[
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migrations.AlterField("Foo", "age", models.IntegerField()),
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migrations.RemoveField("Foo", "age"),
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],
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[
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migrations.RemoveField("Foo", "age"),
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],
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)
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def test_optimize_through_fields(self):
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"""
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Checks that field-level through checking is working.
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This should manage to collapse model Foo to nonexistence,
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and model Bar to a single IntegerField called "width".
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"""
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self.assertOptimizesTo(
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[
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migrations.CreateModel("Foo", [("name", models.CharField(max_length=255))]),
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migrations.CreateModel("Bar", [("size", models.IntegerField())]),
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migrations.AddField("Foo", "age", models.IntegerField()),
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migrations.AddField("Bar", "width", models.IntegerField()),
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migrations.AlterField("Foo", "age", models.IntegerField()),
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migrations.RenameField("Bar", "size", "dimensions"),
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migrations.RemoveField("Foo", "age"),
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migrations.RenameModel("Foo", "Phou"),
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migrations.RemoveField("Bar", "dimensions"),
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migrations.RenameModel("Phou", "Fou"),
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migrations.DeleteModel("Fou"),
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],
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[
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migrations.CreateModel("Bar", [("width", models.IntegerField())]),
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],
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)
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