More work: instance_loaders

Author: Viicos

stubs/django-import-export/import_export/fields.pyi

@@ -27,7 +27,7 @@ class Field:
         dehydrate_method: str | None = None,
         m2m_add: bool = False,
     ) -> None: ...
-    def clean(self, data: Mapping[str, Any], **kwargs: Any): ...
+    def clean(self, data: Mapping[str, Any], **kwargs: Any) -> Any: ...
     def get_value(self, obj: Model) -> Any: ...
     def save(self, obj: Model, data: Mapping[str, Any], is_m2m: bool = False, **kwargs: Any) -> None: ...
     def export(self, obj: Model) -> str: ...

stubs/django-import-export/import_export/instance_loaders.pyi

@@ -1,17 +1,21 @@
-from _typeshed import Incomplete
+from collections.abc import Mapping
+from typing import Any
+
+from django.db.models import Model, QuerySet
+from tablib import Dataset
+
+from .fields import Field
+from .resources import Resource
 
 class BaseInstanceLoader:
-    resource: Incomplete
-    dataset: Incomplete
-    def __init__(self, resource, dataset: Incomplete | None = None) -> None: ...
-    def get_instance(self, row) -> None: ...
+    resource: Resource
+    dataset: Dataset | None
+    def __init__(self, resource: Resource, dataset: Dataset | None = None) -> None: ...
+    def get_instance(self, row: Mapping[str, Any]) -> Model | None: ...
 
 class ModelInstanceLoader(BaseInstanceLoader):
-    def get_queryset(self): ...
-    def get_instance(self, row): ...
+    def get_queryset(self) -> QuerySet: ...
 
 class CachedInstanceLoader(ModelInstanceLoader):
-    pk_field: Incomplete
-    all_instances: Incomplete
-    def __init__(self, *args, **kwargs) -> None: ...
-    def get_instance(self, row): ...
+    pk_field: Field
+    all_instances: dict[Any, Model]