Don't append __typename if it's already being selection (#1221)

ChilliCream · Dec 3, 2019 · 23b86f3 · 23b86f3
1 parent 6a79e72
commit 23b86f3
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/src/Stitching/Stitching/Utilities/ExtractFieldQuerySyntaxRewriter.cs b/src/Stitching/Stitching/Utilities/ExtractFieldQuerySyntaxRewriter.cs
@@ -179,7 +179,12 @@ protected override SelectionSetNode RewriteSelectionSet(
 
             RemoveDelegationFields(current, context, selections);
             AddDependencies(context.TypeContext, selections, dependencies);
-            selections.Add(CreateField(WellKnownFieldNames.TypeName));
+
+            if (!selections.OfType<FieldNode>().Any(n => n.Name.Value == WellKnownFieldNames.TypeName))
+            {
+                selections.Add(CreateField(WellKnownFieldNames.TypeName));
+            }
+
             current = current.WithSelections(selections);
             current = base.RewriteSelectionSet(current, context);
             current = OnRewriteSelectionSet(current, context);