specify serializable attributes in field model

lib/custom_wizard/field.rb

@@ -44,6 +44,28 @@ class CustomWizard::Field
     attributes - accessible_attributes - excluded_attributes
   end
 
+  def self.serializable_attributes
+    %i{
+      id
+      index
+      type
+      required
+      value
+      label
+      placeholder
+      description
+      image
+      file_types
+      format
+      limit
+      property
+      content
+      validations
+      max_length
+      char_counter
+    }
+  end
+
   attr_reader *readonly_attributes
   attr_accessor *accessible_attributes
 

serializers/custom_wizard/wizard_field_serializer.rb

@@ -8,23 +8,7 @@
 ##
 class CustomWizard::FieldSerializer < ::ApplicationSerializer
 
-  attributes :id,
-             :index,
-             :type,
-             :required,
-             :value,
-             :label,
-             :placeholder,
-             :description,
-             :image,
-             :file_types,
-             :format,
-             :limit,
-             :property,
-             :content,
-             :validations,
-             :max_length,
-             :char_counter
+  attributes *CustomWizard::Field.serializable_attributes
 
   def id
     object.id