add questions query

app/graphql/progress_test_schema.rb

@@ -16,22 +16,23 @@ class ProgressTestSchema < GraphQL::Schema
 
   # Union and Interface Resolution
   def self.resolve_type(abstract_type, obj, ctx)
-    # TODO: Implement this method
-    # to return the correct GraphQL object type for `obj`
-    raise(GraphQL::RequiredImplementationMissingError)
+    case obj
+    when Question
+      Types::QuestionType
+    else
+      raise("Unexpected object: #{obj}")
+    end
   end
 
   # Relay-style Object Identification:
 
   # Return a string UUID for `object`
   def self.id_from_object(object, type_definition, query_ctx)
-    # For example, use Rails' GlobalID library (https://github.com/rails/globalid):
     object.to_gid_param
   end
 
   # Given a string UUID, find the object
   def self.object_from_id(global_id, query_ctx)
-    # For example, use Rails' GlobalID library (https://github.com/rails/globalid):
     GlobalID.find(global_id)
   end
 end