Fixed so that GrapheneFilterSetMixin is used with any provided filterset_class

Author: sierreis

graphene_django/filter/fields.py

@@ -35,17 +35,16 @@ def args(self, args):
     @property
     def filterset_class(self):
         if not self._filterset_class:
-            if not self.node_type._meta.filterset_class:
-                fields = self._fields or self.node_type._meta.filter_fields
-                meta = dict(model=self.model, fields=fields)
-                if self._extra_filter_meta:
-                    meta.update(self._extra_filter_meta)
+            fields = self._fields or self.node_type._meta.filter_fields
+            meta = dict(model=self.model, fields=fields)
+            if self._extra_filter_meta:
+                meta.update(self._extra_filter_meta)
 
-                self._filterset_class = get_filterset_class(
-                    self._provided_filterset_class, **meta
-                )
-            else:
-                self._filterset_class = self.node_type._meta.filterset_class
+            filterset_class = self._provided_filterset_class or (
+                self.node_type._meta.filterset_class)
+            self._filterset_class = get_filterset_class(
+                filterset_class, **meta
+            )
 
         return self._filterset_class