add possibility to filter on through models fields

ormar/models/model.py

@@ -22,7 +22,7 @@ class Model(ModelRow):
     __abstract__ = False
     if TYPE_CHECKING:  # pragma nocover
         Meta: ModelMeta
-        objects: "QuerySet"
+        objects: "QuerySet[Model]"
 
     def __repr__(self) -> str:  # pragma nocover
         _repr = {k: getattr(self, k) for k, v in self.Meta.model_fields.items()}

ormar/models/newbasemodel.py

@@ -310,7 +310,7 @@ class NewBaseModel(pydantic.BaseModel, ModelTableProxy, metaclass=ModelMetaclass
         :rtype: Optional[Union[Model, List[Model]]]
         """
         if item in self._orm:
-            return self._orm.get(item)
+            return self._orm.get(item)  # type: ignore
         return None  # pragma no cover
 
     def __eq__(self, other: object) -> bool: