Document resource_params

lib/generators/administrate/dashboard/templates/controller.rb.erb

@@ -29,6 +29,18 @@ module <%= namespace.classify %>
     #   end
     # end
 
+    # Override `resource_params` if you want to transform the submitted
+    # data before it's persisted. For example, the following would turn all
+    # empty values into nil values:
+    #
+    # def resource_params
+    #   params.require(resource_name)
+    #     .permit(dashboard_class::FORM_ATTRIBUTES)
+    #     .transform_values do |value|
+    #       value == "" ? nil : value
+    #     end
+    # end
+
     # See https://administrate-prototype.herokuapp.com/customizing_controller_actions
     # for more information
   end