392 lines
14 KiB
Python
392 lines
14 KiB
Python
from django.apps.registry import Apps
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from django.db import models
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from django.db.migrations.state import ProjectState, ModelState, InvalidBasesError
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from django.test import TestCase
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from .models import ModelWithCustomBase
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class StateTests(TestCase):
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"""
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Tests state construction, rendering and modification by operations.
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"""
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def test_create(self):
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"""
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Tests making a ProjectState from an Apps
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"""
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new_apps = Apps(["migrations"])
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class Author(models.Model):
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name = models.CharField(max_length=255)
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bio = models.TextField()
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age = models.IntegerField(blank=True, null=True)
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class Meta:
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app_label = "migrations"
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apps = new_apps
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unique_together = ["name", "bio"]
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index_together = ["bio", "age"]
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class AuthorProxy(Author):
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class Meta:
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app_label = "migrations"
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apps = new_apps
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proxy = True
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ordering = ["name"]
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class SubAuthor(Author):
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width = models.FloatField(null=True)
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class Meta:
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app_label = "migrations"
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apps = new_apps
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class Book(models.Model):
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title = models.CharField(max_length=1000)
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author = models.ForeignKey(Author)
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contributors = models.ManyToManyField(Author)
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class Meta:
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app_label = "migrations"
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apps = new_apps
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verbose_name = "tome"
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db_table = "test_tome"
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project_state = ProjectState.from_apps(new_apps)
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author_state = project_state.models['migrations', 'author']
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author_proxy_state = project_state.models['migrations', 'authorproxy']
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sub_author_state = project_state.models['migrations', 'subauthor']
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book_state = project_state.models['migrations', 'book']
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self.assertEqual(author_state.app_label, "migrations")
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self.assertEqual(author_state.name, "Author")
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self.assertEqual([x for x, y in author_state.fields], ["id", "name", "bio", "age"])
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self.assertEqual(author_state.fields[1][1].max_length, 255)
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self.assertEqual(author_state.fields[2][1].null, False)
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self.assertEqual(author_state.fields[3][1].null, True)
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self.assertEqual(author_state.options, {"unique_together": set([("name", "bio")]), "index_together": set([("bio", "age")])})
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self.assertEqual(author_state.bases, (models.Model, ))
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self.assertEqual(book_state.app_label, "migrations")
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self.assertEqual(book_state.name, "Book")
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self.assertEqual([x for x, y in book_state.fields], ["id", "title", "author", "contributors"])
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self.assertEqual(book_state.fields[1][1].max_length, 1000)
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self.assertEqual(book_state.fields[2][1].null, False)
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self.assertEqual(book_state.fields[3][1].__class__.__name__, "ManyToManyField")
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self.assertEqual(book_state.options, {"verbose_name": "tome", "db_table": "test_tome"})
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self.assertEqual(book_state.bases, (models.Model, ))
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self.assertEqual(author_proxy_state.app_label, "migrations")
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self.assertEqual(author_proxy_state.name, "AuthorProxy")
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self.assertEqual(author_proxy_state.fields, [])
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self.assertEqual(author_proxy_state.options, {"proxy": True, "ordering": ["name"]})
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self.assertEqual(author_proxy_state.bases, ("migrations.author", ))
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self.assertEqual(sub_author_state.app_label, "migrations")
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self.assertEqual(sub_author_state.name, "SubAuthor")
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self.assertEqual(len(sub_author_state.fields), 2)
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self.assertEqual(sub_author_state.bases, ("migrations.author", ))
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def test_render(self):
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"""
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Tests rendering a ProjectState into an Apps.
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"""
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project_state = ProjectState()
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project_state.add_model_state(ModelState(
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"migrations",
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"Tag",
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[
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("id", models.AutoField(primary_key=True)),
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("name", models.CharField(max_length=100)),
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("hidden", models.BooleanField()),
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],
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{},
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None,
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))
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project_state.add_model_state(ModelState(
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"migrations",
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"SubTag",
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[
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('tag_ptr', models.OneToOneField(
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auto_created=True,
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primary_key=True,
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to_field='id',
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serialize=False,
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to='migrations.Tag',
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)),
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("awesome", models.BooleanField()),
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],
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options={},
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bases=("migrations.Tag",),
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))
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new_apps = project_state.render()
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self.assertEqual(new_apps.get_model("migrations", "Tag")._meta.get_field_by_name("name")[0].max_length, 100)
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self.assertEqual(new_apps.get_model("migrations", "Tag")._meta.get_field_by_name("hidden")[0].null, False)
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self.assertEqual(len(new_apps.get_model("migrations", "SubTag")._meta.local_fields), 2)
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def test_render_model_inheritance(self):
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class Book(models.Model):
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title = models.CharField(max_length=1000)
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class Meta:
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app_label = "migrations"
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apps = Apps()
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class Novel(Book):
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class Meta:
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app_label = "migrations"
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apps = Apps()
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# First, test rendering individually
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apps = Apps(["migrations"])
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# We shouldn't be able to render yet
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ms = ModelState.from_model(Novel)
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with self.assertRaises(InvalidBasesError):
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ms.render(apps)
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# Once the parent model is in the app registry, it should be fine
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ModelState.from_model(Book).render(apps)
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ModelState.from_model(Novel).render(apps)
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def test_render_model_with_multiple_inheritance(self):
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class Foo(models.Model):
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class Meta:
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app_label = "migrations"
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apps = Apps()
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class Bar(models.Model):
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class Meta:
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app_label = "migrations"
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apps = Apps()
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class FooBar(Foo, Bar):
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class Meta:
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app_label = "migrations"
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apps = Apps()
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class AbstractSubFooBar(FooBar):
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class Meta:
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abstract = True
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apps = Apps()
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class SubFooBar(AbstractSubFooBar):
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class Meta:
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app_label = "migrations"
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apps = Apps()
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apps = Apps(["migrations"])
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# We shouldn't be able to render yet
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ms = ModelState.from_model(FooBar)
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with self.assertRaises(InvalidBasesError):
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ms.render(apps)
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# Once the parent models are in the app registry, it should be fine
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ModelState.from_model(Foo).render(apps)
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self.assertSequenceEqual(ModelState.from_model(Foo).bases, [models.Model])
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ModelState.from_model(Bar).render(apps)
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self.assertSequenceEqual(ModelState.from_model(Bar).bases, [models.Model])
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ModelState.from_model(FooBar).render(apps)
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self.assertSequenceEqual(ModelState.from_model(FooBar).bases, ['migrations.foo', 'migrations.bar'])
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ModelState.from_model(SubFooBar).render(apps)
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self.assertSequenceEqual(ModelState.from_model(SubFooBar).bases, ['migrations.foobar'])
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def test_render_project_dependencies(self):
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"""
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Tests that the ProjectState render method correctly renders models
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to account for inter-model base dependencies.
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"""
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new_apps = Apps()
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class A(models.Model):
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class Meta:
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app_label = "migrations"
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apps = new_apps
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class B(A):
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class Meta:
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app_label = "migrations"
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apps = new_apps
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class C(B):
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class Meta:
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app_label = "migrations"
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apps = new_apps
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class D(A):
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class Meta:
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app_label = "migrations"
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apps = new_apps
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class E(B):
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class Meta:
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app_label = "migrations"
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apps = new_apps
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proxy = True
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class F(D):
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class Meta:
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app_label = "migrations"
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apps = new_apps
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proxy = True
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# Make a ProjectState and render it
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project_state = ProjectState()
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project_state.add_model_state(ModelState.from_model(A))
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project_state.add_model_state(ModelState.from_model(B))
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project_state.add_model_state(ModelState.from_model(C))
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project_state.add_model_state(ModelState.from_model(D))
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project_state.add_model_state(ModelState.from_model(E))
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project_state.add_model_state(ModelState.from_model(F))
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final_apps = project_state.render()
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self.assertEqual(len(final_apps.get_models()), 6)
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# Now make an invalid ProjectState and make sure it fails
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project_state = ProjectState()
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project_state.add_model_state(ModelState.from_model(A))
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project_state.add_model_state(ModelState.from_model(B))
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project_state.add_model_state(ModelState.from_model(C))
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project_state.add_model_state(ModelState.from_model(F))
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with self.assertRaises(InvalidBasesError):
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project_state.render()
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def test_equality(self):
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"""
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Tests that == and != are implemented correctly.
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"""
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# Test two things that should be equal
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project_state = ProjectState()
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project_state.add_model_state(ModelState(
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"migrations",
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"Tag",
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[
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("id", models.AutoField(primary_key=True)),
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("name", models.CharField(max_length=100)),
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("hidden", models.BooleanField()),
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],
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{},
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None,
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))
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other_state = project_state.clone()
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self.assertEqual(project_state, project_state)
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self.assertEqual(project_state, other_state)
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self.assertEqual(project_state != project_state, False)
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self.assertEqual(project_state != other_state, False)
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# Make a very small change (max_len 99) and see if that affects it
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project_state = ProjectState()
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project_state.add_model_state(ModelState(
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"migrations",
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"Tag",
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[
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("id", models.AutoField(primary_key=True)),
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("name", models.CharField(max_length=99)),
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("hidden", models.BooleanField()),
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],
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{},
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None,
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))
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self.assertNotEqual(project_state, other_state)
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self.assertEqual(project_state == other_state, False)
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def test_dangling_references_throw_error(self):
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new_apps = Apps()
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class Author(models.Model):
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name = models.TextField()
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class Meta:
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app_label = "migrations"
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apps = new_apps
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class Book(models.Model):
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author = models.ForeignKey(Author)
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class Meta:
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app_label = "migrations"
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apps = new_apps
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class Magazine(models.Model):
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authors = models.ManyToManyField(Author)
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class Meta:
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app_label = "migrations"
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apps = new_apps
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# Make a valid ProjectState and render it
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project_state = ProjectState()
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project_state.add_model_state(ModelState.from_model(Author))
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project_state.add_model_state(ModelState.from_model(Book))
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project_state.add_model_state(ModelState.from_model(Magazine))
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rendered_state = project_state.render()
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self.assertEqual(len(rendered_state.get_models()), 3)
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# now make an invalid one with a ForeignKey
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project_state = ProjectState()
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project_state.add_model_state(ModelState.from_model(Book))
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with self.assertRaises(ValueError):
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rendered_state = project_state.render()
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# and another with ManyToManyField
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project_state = ProjectState()
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project_state.add_model_state(ModelState.from_model(Magazine))
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with self.assertRaises(ValueError):
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rendered_state = project_state.render()
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def test_real_apps(self):
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"""
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Tests that including real apps can resolve dangling FK errors.
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This test relies on the fact that contenttypes is always loaded.
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"""
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new_apps = Apps()
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class TestModel(models.Model):
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ct = models.ForeignKey("contenttypes.ContentType")
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class Meta:
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app_label = "migrations"
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apps = new_apps
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# If we just stick it into an empty state it should fail
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project_state = ProjectState()
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project_state.add_model_state(ModelState.from_model(TestModel))
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with self.assertRaises(ValueError):
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project_state.render()
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# If we include the real app it should succeed
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project_state = ProjectState(real_apps=["contenttypes"])
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project_state.add_model_state(ModelState.from_model(TestModel))
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rendered_state = project_state.render()
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self.assertEqual(
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len([x for x in rendered_state.get_models() if x._meta.app_label == "migrations"]),
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1,
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)
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class ModelStateTests(TestCase):
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def test_custom_model_base(self):
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state = ModelState.from_model(ModelWithCustomBase)
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self.assertEqual(state.bases, (models.Model,))
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def test_bound_field_sanity_check(self):
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field = models.CharField(max_length=1)
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field.model = models.Model
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with self.assertRaisesMessage(ValueError,
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'ModelState.fields cannot be bound to a model - "field" is.'):
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ModelState('app', 'Model', [('field', field)])
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def test_fields_immutability(self):
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"""
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Tests that rendering a model state doesn't alter its internal fields.
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"""
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apps = Apps()
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field = models.CharField(max_length=1)
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state = ModelState('app', 'Model', [('name', field)])
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Model = state.render(apps)
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self.assertNotEqual(Model._meta.get_field('name'), field)
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