fix permit_params for renamed resources

specifically, this fixes the tests for AA::Comment

lib/active_admin/resource/naming.rb

@@ -24,6 +24,16 @@ def resource_label
       def plural_resource_label(options = {})
         resource_name.translate ({count: ::ActiveAdmin::Helpers::I18n::PLURAL_MANY_COUNT, default: resource_label.pluralize.titleize}).merge(options)
       end
+
+      # Helper method for forms. Forms still use a model's param_key, even if
+      # the model has been renamed, so we can't use our custom `resource_name` above.
+      def param_key
+        if resource_class.respond_to? :model_name
+          resource_class.model_name.param_key
+        else
+          resource_name.param_key
+        end
+      end
     end
 
     # A subclass of ActiveModel::Name which supports the different APIs presented

lib/active_admin/resource_dsl.rb

@@ -41,12 +41,11 @@ def scope(*args, &block)
     #   end
     #
     def permit_params(*args, &block)
-      resource_sym = config.resource_name.singular.to_sym
+      param_key = config.param_key.to_sym
 
       controller do
         define_method :permitted_params do
-          params.permit resource_sym =>
-                        block ? instance_exec(&block) : args
+          params.permit param_key => block ? instance_exec(&block) : args
         end
       end
     end