lib/graphql/schema/argument.rb in graphql-2.1.7 vs lib/graphql/schema/argument.rb in graphql-2.1.8

@@ -219,11 +219,16 @@
             # The problem here is, we _used to_ prepare while building variables.
             # But now we don't have the runtime object there.
             #
             # This will have to be called later, when the runtime object _is_ available.
             value
-          else
+          elsif obj.respond_to?(@prepare)
             obj.public_send(@prepare, value)
+          elsif owner.respond_to?(@prepare)
+            owner.public_send(@prepare, value, context || obj.context)
+          else
+            raise "Invalid prepare for #{@owner.name}.name: #{@prepare.inspect}. "\
+              "Could not find prepare method #{@prepare} on #{obj.class} or #{owner}."
           end
         elsif @prepare.respond_to?(:call)
           @prepare.call(value, context || obj.context)
         else
           raise "Invalid prepare for #{@owner.name}.name: #{@prepare.inspect}"