overwrite unique constraints as old are bind to table

ormar/models/metaclass.py

@@ -583,7 +583,9 @@ def update_attrs_and_fields(
     model_fields.update(new_model_fields)
 
 
-def update_attrs_from_base_meta(base_class: "Model", attrs: Dict, ) -> None:
+def update_attrs_from_base_meta(  # noqa: CCR001
+    base_class: "Model", attrs: Dict,
+) -> None:
     """
     Updates Meta parameters in child from parent if needed.
 
@@ -594,16 +596,22 @@ def update_attrs_from_base_meta(base_class: "Model", attrs: Dict, ) -> None:
     """
     params_to_update = ["metadata", "database", "constraints"]
     for param in params_to_update:
-        current_value = attrs.get('Meta', {}).__dict__.get(param, ormar.Undefined)
-        parent_value = base_class.Meta.__dict__.get(param) if hasattr(base_class, 'Meta') else None
+        current_value = attrs.get("Meta", {}).__dict__.get(param, ormar.Undefined)
+        parent_value = (
+            base_class.Meta.__dict__.get(param) if hasattr(base_class, "Meta") else None
+        )
         if parent_value:
+            if param == "constraints":
+                parent_value = [
+                    ormar.UniqueColumns(*x._pending_colargs) for x in parent_value
+                ]
             if isinstance(current_value, list):
                 current_value.extend(parent_value)
             else:
                 setattr(attrs["Meta"], param, parent_value)
 
 
-def extract_from_parents_definition(
+def extract_from_parents_definition(  # noqa: CCR001
     base_class: type,
     curr_class: type,
     attrs: Dict,

tests/test_inheritance_concrete.py

@@ -92,6 +92,7 @@ def test_init_of_abstract_model():
 
 def test_field_redefining_raises_error():
     with pytest.raises(ModelDefinitionError):
+
         class WrongField(DateFieldsModel):  # pragma: no cover
             class Meta(ormar.ModelMeta):
                 tablename = "wrongs"
@@ -104,6 +105,7 @@ def test_field_redefining_raises_error():
 
 def test_model_subclassing_non_abstract_raises_error():
     with pytest.raises(ModelDefinitionError):
+
         class WrongField2(DateFieldsModelNoSubclass):  # pragma: no cover
             class Meta(ormar.ModelMeta):
                 tablename = "wrongs"