update value_from_ast/ast_from_value

Author: jaemk

graphql/utils/ast_from_value.py

@@ -8,12 +8,16 @@
 from ..type.definition import (GraphQLEnumType, GraphQLInputObjectType,
                                GraphQLList, GraphQLNonNull)
 from ..type.scalars import GraphQLFloat
+from ..utils.undefined import UndefinedDefaultValue
 
 
 def ast_from_value(value, type=None):
     if isinstance(type, GraphQLNonNull):
         return ast_from_value(value, type.of_type)
 
+    if value is UndefinedDefaultValue:
+        return
+
     if value is None:
         return ast.NullValue()
 

graphql/utils/value_from_ast.py

@@ -1,6 +1,7 @@
 from ..language import ast
 from ..type import (GraphQLEnumType, GraphQLInputObjectType, GraphQLList,
                     GraphQLNonNull, GraphQLScalarType)
+from ..utils.undefined import UndefinedDefaultValue
 
 
 def value_from_ast(value_ast, type, variables=None):
@@ -48,7 +49,7 @@ def value_from_ast(value_ast, type, variables=None):
         obj = {}
         for field_name, field in fields.items():
             if field_name not in field_asts:
-                if field.default_value is not None:
+                if field.default_value is not UndefinedDefaultValue:
                     # We use out_name as the output name for the
                     # dict if exists
                     obj[field.out_name or field_name] = field.default_value