Add Django 4.1 constraints violation_error_message

django-stubs/contrib/postgres/constraints.pyi

@@ -19,4 +19,5 @@ class ExclusionConstraint(BaseConstraint):
         deferrable: Deferrable | None = ...,
         include: list[str] | tuple[str] | None = ...,
         opclasses: list[str] | tuple[str] = ...,
+        violation_error_message: str | None = ...
     ) -> None: ...

django-stubs/db/models/constraints.pyi

@@ -14,7 +14,8 @@ class Deferrable(Enum):
 
 class BaseConstraint:
     name: str
-    def __init__(self, name: str) -> None: ...
+    violation_error_message: str | None = ...
+    def __init__(self, name: str, violation_error_message: str | None = ...) -> None: ...
     def constraint_sql(self, model: type[Model] | None, schema_editor: BaseDatabaseSchemaEditor | None) -> str: ...
     def create_sql(self, model: type[Model] | None, schema_editor: BaseDatabaseSchemaEditor | None) -> str: ...
     def remove_sql(self, model: type[Model] | None, schema_editor: BaseDatabaseSchemaEditor | None) -> str: ...
@@ -23,7 +24,7 @@ class BaseConstraint:
 
 class CheckConstraint(BaseConstraint):
     check: Q
-    def __init__(self, *, check: Q, name: str) -> None: ...
+    def __init__(self, *, check: Q, name: str, violation_error_message: str | None = ...) -> None: ...
 
 class UniqueConstraint(BaseConstraint):
     expressions: tuple[Combinable, ...]
@@ -41,6 +42,7 @@ class UniqueConstraint(BaseConstraint):
         deferrable: Deferrable | None = ...,
         include: Sequence[str] | None = ...,
         opclasses: Sequence[Any] = ...,
+        violation_error_message: str | None = ...
     ) -> None: ...
     @overload
     def __init__(
@@ -52,4 +54,5 @@ class UniqueConstraint(BaseConstraint):
         deferrable: Deferrable | None = ...,
         include: Sequence[str] | None = ...,
         opclasses: Sequence[Any] = ...,
+        violation_error_message: str | None = ...
     ) -> None: ...

tests/typecheck/db/models/test_constraints.yml

@@ -35,3 +35,13 @@
         main:4: note: Possible overload variants:
         main:4: note:     .*
         main:4: note:     .*
+
+-   case: constraint_violation_error_message
+    main: |
+        from django.db.models import CheckConstraint, Q
+
+        CheckConstraint(
+            check=Q(name__startswith='a'),
+            name='name_starts_with_a',
+            violation_error_message='Name must start with a',
+        )