constraints edits for partial indexes

MongoDB doesn't support isnull constraints.

Author: timgraham

tests/constraints/models.py

@@ -58,7 +58,7 @@ class Meta:
             models.UniqueConstraint(
                 fields=["name"],
                 name="name_without_color_uniq",
-                condition=models.Q(color__isnull=True),
+                condition=models.Q(color="blue"),
             ),
         ]
 

tests/constraints/tests.py

@@ -821,10 +821,10 @@ def test_database_constraint(self):
 
     @skipUnlessDBFeature("supports_partial_indexes")
     def test_database_constraint_with_condition(self):
-        UniqueConstraintConditionProduct.objects.create(name="p1")
-        UniqueConstraintConditionProduct.objects.create(name="p2")
+        UniqueConstraintConditionProduct.objects.create(name="p1", color="blue")
+        UniqueConstraintConditionProduct.objects.create(name="p2", color="blue")
         with self.assertRaises(IntegrityError):
-            UniqueConstraintConditionProduct.objects.create(name="p1")
+            UniqueConstraintConditionProduct.objects.create(name="p1", color="blue")
 
     def test_model_validation(self):
         msg = "Unique constraint product with this Name and Color already exists."
@@ -840,13 +840,14 @@ def test_model_validation_with_condition(self):
         Model.validate_constraints().
         """
         obj1 = UniqueConstraintConditionProduct.objects.create(name="p1", color="red")
-        obj2 = UniqueConstraintConditionProduct.objects.create(name="p2")
+        obj2 = UniqueConstraintConditionProduct.objects.create(name="p2", color="blue")
         UniqueConstraintConditionProduct(
             name=obj1.name, color="blue"
         ).validate_constraints()
         msg = "Constraint “name_without_color_uniq” is violated."
         with self.assertRaisesMessage(ValidationError, msg):
-            UniqueConstraintConditionProduct(name=obj2.name).validate_constraints()
+            p = UniqueConstraintConditionProduct(name=obj2.name, color="blue")
+            p.validate_constraints()
 
     def test_model_validation_constraint_no_code_error(self):
         class ValidateNoCodeErrorConstraint(UniqueConstraint):
@@ -917,13 +918,13 @@ def test_validate_fields_unattached(self):
 
     @skipUnlessDBFeature("supports_partial_indexes")
     def test_validate_condition(self):
-        p1 = UniqueConstraintConditionProduct.objects.create(name="p1")
+        p1 = UniqueConstraintConditionProduct.objects.create(name="p1", color="blue")
         constraint = UniqueConstraintConditionProduct._meta.constraints[0]
         msg = "Constraint “name_without_color_uniq” is violated."
         with self.assertRaisesMessage(ValidationError, msg):
             constraint.validate(
                 UniqueConstraintConditionProduct,
-                UniqueConstraintConditionProduct(name=p1.name, color=None),
+                UniqueConstraintConditionProduct(name=p1.name, color="blue"),
             )
         # Values not matching condition are ignored.
         constraint.validate(
@@ -941,19 +942,19 @@ def test_validate_condition(self):
 
     @skipUnlessDBFeature("supports_partial_indexes")
     def test_validate_condition_custom_error(self):
-        p1 = UniqueConstraintConditionProduct.objects.create(name="p1")
+        p1 = UniqueConstraintConditionProduct.objects.create(name="p1", color="blue")
         constraint = models.UniqueConstraint(
             fields=["name"],
             name="name_without_color_uniq",
-            condition=models.Q(color__isnull=True),
+            condition=models.Q(color="blue"),
             violation_error_code="custom_code",
             violation_error_message="Custom message",
         )
         msg = "Custom message"
         with self.assertRaisesMessage(ValidationError, msg) as cm:
             constraint.validate(
                 UniqueConstraintConditionProduct,
-                UniqueConstraintConditionProduct(name=p1.name, color=None),
+                UniqueConstraintConditionProduct(name=p1.name, color="blue"),
             )
         self.assertEqual(cm.exception.code, "custom_code")
 
@@ -1006,9 +1007,13 @@ def test_validate_expression_condition(self):
         constraint = models.UniqueConstraint(
             Lower("name"),
             name="name_lower_without_color_uniq",
-            condition=models.Q(color__isnull=True),
+            condition=models.Q(color="blue"),
+        )
+        p2 = UniqueConstraintProduct.objects.create(name="p2", color="blue")
+        non_unique_product = UniqueConstraintProduct(
+            name=p2.name.upper(),
+            color=p2.color,
         )
-        non_unique_product = UniqueConstraintProduct(name=self.p2.name.upper())
         msg = "Constraint “name_lower_without_color_uniq” is violated."
         with self.assertRaisesMessage(ValidationError, msg):
             constraint.validate(UniqueConstraintProduct, non_unique_product)

tests/introspection/models.py

@@ -97,7 +97,7 @@ class Meta:
             models.UniqueConstraint(
                 fields=["name"],
                 name="cond_name_without_color_uniq",
-                condition=models.Q(color__isnull=True),
+                condition=models.Q(color="blue"),
             ),
         ]