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245 lines
8.9 KiB
Python
245 lines
8.9 KiB
Python
from django.core import checks
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from django.db import connection, models
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from django.db.models import F
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from django.test import TestCase, skipUnlessAnyDBFeature
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from django.test.utils import isolate_apps
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@isolate_apps("composite_pk")
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class CompositePKChecksTests(TestCase):
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maxDiff = None
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def test_composite_pk_must_be_unique_strings(self):
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test_cases = (
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(),
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(0,),
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(1,),
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("id", False),
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("id", "id"),
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(("id",),),
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)
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for i, args in enumerate(test_cases):
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with (
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self.subTest(args=args),
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self.assertRaisesMessage(
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ValueError, "CompositePrimaryKey args must be unique strings."
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),
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):
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models.CompositePrimaryKey(*args)
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def test_composite_pk_must_include_at_least_2_fields(self):
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expected_message = "CompositePrimaryKey must include at least two fields."
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with self.assertRaisesMessage(ValueError, expected_message):
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models.CompositePrimaryKey("id")
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def test_composite_pk_cannot_have_a_default(self):
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expected_message = "CompositePrimaryKey cannot have a default."
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with self.assertRaisesMessage(ValueError, expected_message):
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models.CompositePrimaryKey("tenant_id", "id", default=(1, 1))
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def test_composite_pk_cannot_have_a_database_default(self):
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expected_message = "CompositePrimaryKey cannot have a database default."
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with self.assertRaisesMessage(ValueError, expected_message):
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models.CompositePrimaryKey("tenant_id", "id", db_default=models.F("id"))
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def test_composite_pk_cannot_be_editable(self):
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expected_message = "CompositePrimaryKey cannot be editable."
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with self.assertRaisesMessage(ValueError, expected_message):
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models.CompositePrimaryKey("tenant_id", "id", editable=True)
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def test_composite_pk_must_be_a_primary_key(self):
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expected_message = "CompositePrimaryKey must be a primary key."
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with self.assertRaisesMessage(ValueError, expected_message):
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models.CompositePrimaryKey("tenant_id", "id", primary_key=False)
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def test_composite_pk_must_be_blank(self):
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expected_message = "CompositePrimaryKey must be blank."
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with self.assertRaisesMessage(ValueError, expected_message):
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models.CompositePrimaryKey("tenant_id", "id", blank=False)
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def test_composite_pk_must_not_have_other_pk_field(self):
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class Foo(models.Model):
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pk = models.CompositePrimaryKey("foo_id", "id")
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foo_id = models.IntegerField()
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id = models.IntegerField(primary_key=True)
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self.assertEqual(
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Foo.check(databases=self.databases),
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[
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checks.Error(
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"The model cannot have more than one field with "
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"'primary_key=True'.",
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obj=Foo,
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id="models.E026",
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),
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],
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)
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def test_composite_pk_cannot_include_nullable_field(self):
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class Foo(models.Model):
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pk = models.CompositePrimaryKey("foo_id", "id")
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foo_id = models.IntegerField()
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id = models.IntegerField(null=True)
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self.assertEqual(
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Foo.check(databases=self.databases),
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[
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checks.Error(
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"'id' cannot be included in the composite primary key.",
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hint="'id' field may not set 'null=True'.",
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obj=Foo,
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id="models.E042",
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),
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],
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)
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def test_composite_pk_can_include_fk_name(self):
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class Foo(models.Model):
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pass
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class Bar(models.Model):
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pk = models.CompositePrimaryKey("foo", "id")
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foo = models.ForeignKey(Foo, on_delete=models.CASCADE)
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id = models.SmallIntegerField()
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self.assertEqual(Foo.check(databases=self.databases), [])
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self.assertEqual(Bar.check(databases=self.databases), [])
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def test_composite_pk_cannot_include_same_field(self):
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class Foo(models.Model):
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pass
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class Bar(models.Model):
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pk = models.CompositePrimaryKey("foo", "foo_id")
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foo = models.ForeignKey(Foo, on_delete=models.CASCADE)
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id = models.SmallIntegerField()
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self.assertEqual(Foo.check(databases=self.databases), [])
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self.assertEqual(
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Bar.check(databases=self.databases),
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[
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checks.Error(
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"'foo_id' cannot be included in the composite primary key.",
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hint="'foo_id' and 'foo' are the same fields.",
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obj=Bar,
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id="models.E042",
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),
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],
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)
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def test_composite_pk_cannot_include_composite_pk_field(self):
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class Foo(models.Model):
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pk = models.CompositePrimaryKey("id", "pk")
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id = models.SmallIntegerField()
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self.assertEqual(
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Foo.check(databases=self.databases),
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[
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checks.Error(
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"'pk' cannot be included in the composite primary key.",
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hint="'pk' field has no column.",
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obj=Foo,
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id="models.E042",
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),
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],
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)
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def test_composite_pk_cannot_include_db_column(self):
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class Foo(models.Model):
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pk = models.CompositePrimaryKey("foo", "bar")
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foo = models.SmallIntegerField(db_column="foo_id")
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bar = models.SmallIntegerField(db_column="bar_id")
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class Bar(models.Model):
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pk = models.CompositePrimaryKey("foo_id", "bar_id")
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foo = models.SmallIntegerField(db_column="foo_id")
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bar = models.SmallIntegerField(db_column="bar_id")
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self.assertEqual(Foo.check(databases=self.databases), [])
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self.assertEqual(
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Bar.check(databases=self.databases),
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[
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checks.Error(
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"'foo_id' cannot be included in the composite primary key.",
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hint="'foo_id' is not a valid field.",
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obj=Bar,
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id="models.E042",
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),
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checks.Error(
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"'bar_id' cannot be included in the composite primary key.",
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hint="'bar_id' is not a valid field.",
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obj=Bar,
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id="models.E042",
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),
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],
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)
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def test_foreign_object_can_refer_composite_pk(self):
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class Foo(models.Model):
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pass
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class Bar(models.Model):
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pk = models.CompositePrimaryKey("foo_id", "id")
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foo = models.ForeignKey(Foo, on_delete=models.CASCADE)
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id = models.IntegerField()
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class Baz(models.Model):
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pk = models.CompositePrimaryKey("foo_id", "id")
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foo = models.ForeignKey(Foo, on_delete=models.CASCADE)
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id = models.IntegerField()
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bar_id = models.IntegerField()
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bar = models.ForeignObject(
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Bar,
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on_delete=models.CASCADE,
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from_fields=("foo_id", "bar_id"),
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to_fields=("foo_id", "id"),
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)
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self.assertEqual(Foo.check(databases=self.databases), [])
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self.assertEqual(Bar.check(databases=self.databases), [])
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self.assertEqual(Baz.check(databases=self.databases), [])
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def test_composite_pk_must_be_named_pk(self):
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class Foo(models.Model):
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primary_key = models.CompositePrimaryKey("foo_id", "id")
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foo_id = models.IntegerField()
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id = models.IntegerField()
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self.assertEqual(
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Foo.check(databases=self.databases),
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[
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checks.Error(
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"'CompositePrimaryKey' must be named 'pk'.",
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obj=Foo._meta.get_field("primary_key"),
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id="fields.E013",
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),
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],
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)
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@skipUnlessAnyDBFeature(
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"supports_virtual_generated_columns",
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"supports_stored_generated_columns",
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)
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def test_composite_pk_cannot_include_generated_field(self):
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class Foo(models.Model):
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pk = models.CompositePrimaryKey("id", "foo")
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id = models.IntegerField()
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foo = models.GeneratedField(
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expression=F("id"),
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output_field=models.IntegerField(),
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db_persist=connection.features.supports_stored_generated_columns,
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)
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self.assertEqual(
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Foo.check(databases=self.databases),
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[
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checks.Error(
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"'foo' cannot be included in the composite primary key.",
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hint="'foo' field is a generated field.",
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obj=Foo,
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id="models.E042",
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),
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],
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)
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