split queryset generation to different method

jsonapi/resource.py

@@ -402,27 +402,29 @@ def _auth_user_resource_paths(cls):
         return result
 
     @classmethod
-    def get(cls, request=None, **kwargs):
-        """ Get resource http response.
+    def get_queryset(cls, request=None, **kwargs):
+        """ Get objects queryset.
 
-        :return str: resource
+        Method is used to generate objects queryset for resource operations.
+        It is aimed to:
+            * Filter objects based on user. Object could be in queryset only if
+            there is attribute-ForeignKey-ManyToMany path from current resource
+            to current auth_user.
+            * Select related objects (or prefetch them) based on requested
+            requested objects to include
 
-        """
-        model = cls.Meta.model
-        queryset = model.objects
+        NOTE: if you need to get user in this method, use
+        cls.authenticate(request), because user could be authenticated using
+        HTTP_BASIC method, not only session.
 
-        filters = {
-            k: v for k, v in kwargs.items()
-            if k not in cls.RESERVED_GET_PARAMS
-            # k in cls.fields_own
-        }
-        if kwargs.get('ids'):
-            filters["id__in"] = kwargs.get('ids')
+        """
+        queryset = cls.Meta.model.objects
 
         if cls.Meta.authenticators:
             user = cls.authenticate(request)
             auth_user_resource_paths = cls._auth_user_resource_paths
             if auth_user_resource_paths is None:
+                # Resource is user
                 queryset = queryset.filter(id=user.id)
             else:
                 user_filter = models.Q()
@@ -431,6 +433,25 @@ def get(cls, request=None, **kwargs):
 
                 queryset = queryset.filter(user_filter)
 
+        return queryset
+
+    @classmethod
+    def get(cls, request=None, **kwargs):
+        """ Get resource http response.
+
+        :return str: resource
+
+        """
+        queryset = cls.get_queryset(request=request, **kwargs)
+
+        filters = {
+            k: v for k, v in kwargs.items()
+            if k not in cls.RESERVED_GET_PARAMS
+            # k in cls.fields_own
+        }
+        if kwargs.get('ids'):
+            filters["id__in"] = kwargs.get('ids')
+
         queryset = queryset.filter(**filters)
 
         # Sort