Merge pull request #1996 from mohatt/ref-resolver-context-fix

fix(graphql): Fix federation reference resolver context args

Author: kamilmysliwiec

packages/graphql/lib/factories/params.factory.ts

@@ -7,6 +7,10 @@ export class GqlParamsFactory implements ParamsFactory {
     if (!args) {
       return null;
     }
+    // Reference resolver args don't have root argument
+    if (args.length === 3) {
+      args = [undefined, ...args];
+    }
     switch (type as GqlParamtype) {
       case GqlParamtype.ROOT:
         return args[0];

packages/graphql/lib/services/gql-execution-context.ts

@@ -11,8 +11,10 @@ export class GqlExecutionContext
 {
   static create(context: ExecutionContext): GqlExecutionContext {
     const type = context.getType();
+    const args = context.getArgs();
     const gqlContext = new GqlExecutionContext(
-      context.getArgs(),
+      // Reference resolver args don't have root argument
+      args.length === 3 ? [undefined, ...args] : args,
       context.getClass(),
       context.getHandler(),
     );