Fix parse_results with fragments (#446)

* Fix issue #445

Author: leszekhanusz

gql/utilities/parse_result.py

@@ -193,7 +193,7 @@ def enter_field(
                 # Key not found in result.
                 # Should never happen in theory with a correct GraphQL backend
                 # Silently ignoring this field
-                log.debug(f"Key {name} not found in result --> REMOVE")
+                log.debug(f"  Key {name} not found in result --> REMOVE")
                 return REMOVE
 
             log.debug(f"  result_value={result_value}")
@@ -232,8 +232,11 @@ def enter_field(
                 )
 
                 # Get parent SelectionSet node
-                new_node = ancestors[-1]
-                assert isinstance(new_node, SelectionSetNode)
+                selection_set_node = ancestors[-1]
+                assert isinstance(selection_set_node, SelectionSetNode)
+
+                # Keep only the current node in a new selection set node
+                new_node = SelectionSetNode(selections=[node])
 
                 for item in result_value:
 

tests/starwars/test_parse_results.py

@@ -37,6 +37,42 @@ def test_hero_name_and_friends_query():
     assert result == parsed_result
 
 
+def test_hero_name_and_friends_query_with_fragment():
+    """Testing for issue #445"""
+
+    query = gql(
+        """
+        query HeroNameAndFriendsQuery {
+          hero {
+            ...HeroSummary
+            friends {
+              name
+            }
+          }
+        }
+        fragment HeroSummary on Character {
+          id
+          name
+        }
+        """
+    )
+    result = {
+        "hero": {
+            "id": "2001",
+            "friends": [
+                {"name": "Luke Skywalker"},
+                {"name": "Han Solo"},
+                {"name": "Leia Organa"},
+            ],
+            "name": "R2-D2",
+        }
+    }
+
+    parsed_result = parse_result(StarWarsSchema, query, result)
+
+    assert result == parsed_result
+
+
 def test_key_not_found_in_result():
 
     query = gql(