Merge pull request #200 from github/constant-directives

Remove a dynamically defined method

lib/graphql/client/schema.rb

@@ -52,6 +52,13 @@ module GraphQL
           const_set(class_name, klass)
         end
 
+        DIRECTIVES = { include: IncludeDirective,
+                       skip: SkipDirective }.freeze
+
+        def directives
+          DIRECTIVES
+        end
+
         private
 
         def normalize_type_name(type_name)
@@ -76,11 +83,6 @@ module GraphQL
           end
         end
 
-        directives = {}
-        mod.define_singleton_method(:directives) { directives }
-        directives[:include] = IncludeDirective
-        directives[:skip] = SkipDirective
-
         mod
       end