Improved experimental resolution

Author: syrusakbary

graphql/execution/experimental/fragment.py

@@ -163,7 +163,9 @@ def possible_types(self):
 
     def get_fragment(self, type):
         if type not in self._fragments:
-            assert type in self.possible_types
+            assert type in self.possible_types, (
+                'Runtime Object type "{}" is not a possible type for "{}".'
+            ).format(type, self.abstract_type)
             self._fragments[type] = Fragment(type, self.selection_set, self.context)
         return self._fragments[type]
 

graphql/execution/experimental/resolver.py

@@ -74,7 +74,9 @@ def complete_object_value(fragment_resolve, exe_context, on_error, result):
 
 
 def field_resolver(field, fragment=None, exe_context=None, info=None):
-    return type_resolver(field.type, field.resolver or default_resolve_fn,
+    # resolver = exe_context.get_field_resolver(field.resolver or default_resolve_fn)
+    resolver = field.resolver or default_resolve_fn
+    return type_resolver(field.type, resolver,
                          fragment, exe_context, info, catch_error=True)