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299 lines
11 KiB
Python
299 lines
11 KiB
Python
import uuid
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from decimal import Decimal
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from django.apps import apps
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from django.db import IntegrityError, connection
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from django.db.models import (
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CharField,
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F,
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FloatField,
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GeneratedField,
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IntegerField,
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Model,
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)
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from django.db.models.functions import Lower
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from django.test import SimpleTestCase, TestCase, skipUnlessDBFeature
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from django.test.utils import isolate_apps
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from .models import (
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Foo,
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GeneratedModel,
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GeneratedModelFieldWithConverters,
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GeneratedModelNull,
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GeneratedModelNullVirtual,
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GeneratedModelOutputFieldDbCollation,
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GeneratedModelOutputFieldDbCollationVirtual,
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GeneratedModelParams,
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GeneratedModelParamsVirtual,
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GeneratedModelVirtual,
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)
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class BaseGeneratedFieldTests(SimpleTestCase):
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def test_editable_unsupported(self):
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with self.assertRaisesMessage(ValueError, "GeneratedField cannot be editable."):
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GeneratedField(
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expression=Lower("name"),
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output_field=CharField(max_length=255),
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editable=True,
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db_persist=False,
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)
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@isolate_apps("model_fields")
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def test_contribute_to_class(self):
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class BareModel(Model):
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pass
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new_field = GeneratedField(
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expression=Lower("nonexistent"),
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output_field=IntegerField(),
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db_persist=True,
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)
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apps.models_ready = False
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try:
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# GeneratedField can be added to the model even when apps are not
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# fully loaded.
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new_field.contribute_to_class(BareModel, "name")
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self.assertEqual(BareModel._meta.get_field("name"), new_field)
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finally:
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apps.models_ready = True
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def test_blank_unsupported(self):
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with self.assertRaisesMessage(ValueError, "GeneratedField must be blank."):
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GeneratedField(
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expression=Lower("name"),
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output_field=CharField(max_length=255),
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blank=False,
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db_persist=False,
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)
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def test_default_unsupported(self):
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msg = "GeneratedField cannot have a default."
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with self.assertRaisesMessage(ValueError, msg):
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GeneratedField(
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expression=Lower("name"),
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output_field=CharField(max_length=255),
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default="",
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db_persist=False,
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)
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def test_database_default_unsupported(self):
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msg = "GeneratedField cannot have a database default."
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with self.assertRaisesMessage(ValueError, msg):
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GeneratedField(
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expression=Lower("name"),
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output_field=CharField(max_length=255),
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db_default="",
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db_persist=False,
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)
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def test_db_persist_required(self):
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msg = "GeneratedField.db_persist must be True or False."
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with self.assertRaisesMessage(ValueError, msg):
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GeneratedField(
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expression=Lower("name"), output_field=CharField(max_length=255)
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)
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with self.assertRaisesMessage(ValueError, msg):
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GeneratedField(
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expression=Lower("name"),
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output_field=CharField(max_length=255),
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db_persist=None,
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)
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def test_deconstruct(self):
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field = GeneratedField(
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expression=F("a") + F("b"), output_field=IntegerField(), db_persist=True
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)
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_, path, args, kwargs = field.deconstruct()
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self.assertEqual(path, "django.db.models.GeneratedField")
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self.assertEqual(args, [])
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self.assertEqual(kwargs["db_persist"], True)
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self.assertEqual(kwargs["expression"], F("a") + F("b"))
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self.assertEqual(
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kwargs["output_field"].deconstruct(), IntegerField().deconstruct()
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)
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@isolate_apps("model_fields")
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def test_get_col(self):
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class Square(Model):
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side = IntegerField()
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area = GeneratedField(
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expression=F("side") * F("side"),
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output_field=IntegerField(),
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db_persist=True,
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)
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col = Square._meta.get_field("area").get_col("alias")
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self.assertIsInstance(col.output_field, IntegerField)
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class FloatSquare(Model):
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side = IntegerField()
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area = GeneratedField(
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expression=F("side") * F("side"),
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db_persist=True,
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output_field=FloatField(),
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)
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col = FloatSquare._meta.get_field("area").get_col("alias")
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self.assertIsInstance(col.output_field, FloatField)
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@isolate_apps("model_fields")
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def test_cached_col(self):
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class Sum(Model):
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a = IntegerField()
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b = IntegerField()
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total = GeneratedField(
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expression=F("a") + F("b"), output_field=IntegerField(), db_persist=True
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)
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field = Sum._meta.get_field("total")
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cached_col = field.cached_col
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self.assertIs(field.get_col(Sum._meta.db_table), cached_col)
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self.assertIs(field.get_col(Sum._meta.db_table, field), cached_col)
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self.assertIsNot(field.get_col("alias"), cached_col)
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self.assertIsNot(field.get_col(Sum._meta.db_table, IntegerField()), cached_col)
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self.assertIs(cached_col.target, field)
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self.assertIsInstance(cached_col.output_field, IntegerField)
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class GeneratedFieldTestMixin:
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def _refresh_if_needed(self, m):
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if not connection.features.can_return_columns_from_insert:
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m.refresh_from_db()
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return m
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def test_unsaved_error(self):
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m = self.base_model(a=1, b=2)
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msg = "Cannot read a generated field from an unsaved model."
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with self.assertRaisesMessage(AttributeError, msg):
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m.field
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def test_create(self):
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m = self.base_model.objects.create(a=1, b=2)
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m = self._refresh_if_needed(m)
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self.assertEqual(m.field, 3)
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def test_non_nullable_create(self):
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with self.assertRaises(IntegrityError):
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self.base_model.objects.create()
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def test_save(self):
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# Insert.
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m = self.base_model(a=2, b=4)
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m.save()
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m = self._refresh_if_needed(m)
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self.assertEqual(m.field, 6)
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# Update.
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m.a = 4
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m.save()
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m.refresh_from_db()
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self.assertEqual(m.field, 8)
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def test_save_model_with_foreign_key(self):
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fk_object = Foo.objects.create(a="abc", d=Decimal("12.34"))
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m = self.base_model(a=1, b=2, fk=fk_object)
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m.save()
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m = self._refresh_if_needed(m)
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self.assertEqual(m.field, 3)
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def test_generated_fields_can_be_deferred(self):
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fk_object = Foo.objects.create(a="abc", d=Decimal("12.34"))
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m = self.base_model.objects.create(a=1, b=2, fk=fk_object)
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m = self.base_model.objects.defer("field").get(id=m.id)
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self.assertEqual(m.get_deferred_fields(), {"field"})
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def test_update(self):
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m = self.base_model.objects.create(a=1, b=2)
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self.base_model.objects.update(b=3)
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m = self.base_model.objects.get(pk=m.pk)
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self.assertEqual(m.field, 4)
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def test_bulk_create(self):
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m = self.base_model(a=3, b=4)
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(m,) = self.base_model.objects.bulk_create([m])
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if not connection.features.can_return_rows_from_bulk_insert:
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m = self.base_model.objects.get()
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self.assertEqual(m.field, 7)
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def test_bulk_update(self):
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m = self.base_model.objects.create(a=1, b=2)
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m.a = 3
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self.base_model.objects.bulk_update([m], fields=["a"])
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m = self.base_model.objects.get(pk=m.pk)
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self.assertEqual(m.field, 5)
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def test_output_field_lookups(self):
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"""Lookups from the output_field are available on GeneratedFields."""
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internal_type = IntegerField().get_internal_type()
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min_value, max_value = connection.ops.integer_field_range(internal_type)
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if min_value is None:
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self.skipTest("Backend doesn't define an integer min value.")
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if max_value is None:
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self.skipTest("Backend doesn't define an integer max value.")
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does_not_exist = self.base_model.DoesNotExist
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underflow_value = min_value - 1
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with self.assertNumQueries(0), self.assertRaises(does_not_exist):
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self.base_model.objects.get(field=underflow_value)
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with self.assertNumQueries(0), self.assertRaises(does_not_exist):
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self.base_model.objects.get(field__lt=underflow_value)
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with self.assertNumQueries(0), self.assertRaises(does_not_exist):
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self.base_model.objects.get(field__lte=underflow_value)
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overflow_value = max_value + 1
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with self.assertNumQueries(0), self.assertRaises(does_not_exist):
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self.base_model.objects.get(field=overflow_value)
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with self.assertNumQueries(0), self.assertRaises(does_not_exist):
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self.base_model.objects.get(field__gt=overflow_value)
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with self.assertNumQueries(0), self.assertRaises(does_not_exist):
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self.base_model.objects.get(field__gte=overflow_value)
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def test_output_field_db_collation(self):
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collation = connection.features.test_collations["virtual"]
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m = self.output_field_db_collation_model.objects.create(name="NAME")
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field = m._meta.get_field("lower_name")
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db_parameters = field.db_parameters(connection)
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self.assertEqual(db_parameters["collation"], collation)
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self.assertEqual(db_parameters["type"], field.output_field.db_type(connection))
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def test_db_type_parameters(self):
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db_type_parameters = self.output_field_db_collation_model._meta.get_field(
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"lower_name"
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).db_type_parameters(connection)
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self.assertEqual(db_type_parameters["max_length"], 11)
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def test_model_with_params(self):
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m = self.params_model.objects.create()
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m = self._refresh_if_needed(m)
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self.assertEqual(m.field, "Constant")
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def test_nullable(self):
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m1 = self.nullable_model.objects.create()
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m1 = self._refresh_if_needed(m1)
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none_val = "" if connection.features.interprets_empty_strings_as_nulls else None
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self.assertEqual(m1.lower_name, none_val)
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m2 = self.nullable_model.objects.create(name="NaMe")
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m2 = self._refresh_if_needed(m2)
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self.assertEqual(m2.lower_name, "name")
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@skipUnlessDBFeature("supports_stored_generated_columns")
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class StoredGeneratedFieldTests(GeneratedFieldTestMixin, TestCase):
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base_model = GeneratedModel
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nullable_model = GeneratedModelNull
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output_field_db_collation_model = GeneratedModelOutputFieldDbCollation
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params_model = GeneratedModelParams
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def test_create_field_with_db_converters(self):
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obj = GeneratedModelFieldWithConverters.objects.create(field=uuid.uuid4())
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obj = self._refresh_if_needed(obj)
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self.assertEqual(obj.field, obj.field_copy)
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@skipUnlessDBFeature("supports_virtual_generated_columns")
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class VirtualGeneratedFieldTests(GeneratedFieldTestMixin, TestCase):
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base_model = GeneratedModelVirtual
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nullable_model = GeneratedModelNullVirtual
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output_field_db_collation_model = GeneratedModelOutputFieldDbCollationVirtual
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params_model = GeneratedModelParamsVirtual
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