Add parentType to path to avoid path ambiguity

src/execution/__tests__/executor-test.js

@@ -306,7 +306,7 @@ describe('Execute: Handles basic execution tasks', () => {
     const field = operation.selectionSet.selections[0];
     expect(resolvedInfo).to.deep.include({
       fieldNodes: [field],
-      path: { prev: undefined, key: 'result' },
+      path: { prev: undefined, key: 'result', parentType: 'Test' },
       variableValues: { var: 'abc' },
     });
   });

src/execution/execute.js

@@ -400,7 +400,7 @@ function executeFieldsSerially(
     Object.keys(fields),
     (results, responseName) => {
       const fieldNodes = fields[responseName];
-      const fieldPath = addPath(path, responseName);
+      const fieldPath = addPath(path, responseName, parentType.name);
       const result = resolveField(
         exeContext,
         parentType,
@@ -440,7 +440,7 @@ function executeFields(
 
   for (const responseName of Object.keys(fields)) {
     const fieldNodes = fields[responseName];
-    const fieldPath = addPath(path, responseName);
+    const fieldPath = addPath(path, responseName, parentType.name);
     const result = resolveField(
       exeContext,
       parentType,
@@ -918,7 +918,7 @@ function completeListValue(
   const completedResults = arrayFrom(result, (item, index) => {
     // No need to modify the info object containing the path,
     // since from here on it is not ever accessed by resolver functions.
-    const fieldPath = addPath(path, index);
+    const fieldPath = addPath(path, index, undefined);
     const completedItem = completeValueCatchingError(
       exeContext,
       itemType,

src/jsutils/Path.d.ts

@@ -1,12 +1,17 @@
 export interface Path {
   prev: Path | undefined;
   key: string | number;
+  parentType: string | undefined;
 }
 
 /**
  * Given a Path and a key, return a new Path containing the new key.
  */
-export function addPath(prev: Path | undefined, key: string | number): Path;
+export function addPath(
+  prev: Path | undefined,
+  key: string | number,
+  parentType: string | undefined,
+): Path;
 
 /**
  * Given a Path, return an Array of the path keys.

src/jsutils/Path.js

@@ -3,6 +3,7 @@
 export type Path = {|
   +prev: Path | void,
   +key: string | number,
+  +parentType: string | void,
 |};
 
 /**
@@ -11,8 +12,9 @@ export type Path = {|
 export function addPath(
   prev: $ReadOnly<Path> | void,
   key: string | number,
+  parentType: string | void,
 ): Path {
-  return { prev, key };
+  return { prev, key, parentType };
 }
 
 /**

src/subscription/subscribe.js

@@ -253,7 +253,7 @@ export function createSourceEventStream(
     // AsyncIterable yielding raw payloads.
     const resolveFn = fieldDef.subscribe ?? exeContext.fieldResolver;
 
-    const path = addPath(undefined, responseName);
+    const path = addPath(undefined, responseName, type.name);
 
     const info = buildResolveInfo(exeContext, fieldDef, fieldNodes, type, path);
 

src/utilities/coerceInputValue.js

@@ -82,7 +82,7 @@ function coerceInputValueImpl(
     const itemType = type.ofType;
     if (isCollection(inputValue)) {
       return arrayFrom(inputValue, (itemValue, index) => {
-        const itemPath = addPath(path, index);
+        const itemPath = addPath(path, index, undefined);
         return coerceInputValueImpl(itemValue, itemType, onError, itemPath);
       });
     }
@@ -126,7 +126,7 @@ function coerceInputValueImpl(
         fieldValue,
         field.type,
         onError,
-        addPath(path, field.name),
+        addPath(path, field.name, undefined),
       );
     }