Move to more reliable custom field metaprogramming

controllers/custom_wizard/admin/custom_fields.rb

@@ -26,7 +26,6 @@ class CustomWizard::AdminCustomFieldsController < CustomWizard::AdminController
     end
     
     if all_fields_saved
-      CustomWizard::CustomField.register_fields
       render json: success_json
     else
       render json: error_json

lib/custom_wizard/custom_field.rb

@@ -80,30 +80,12 @@ class ::CustomWizard::CustomField
       end
   end
   
-  def self.register_fields
-    self.list.each do |field|      
-      klass = field.klass.classify.constantize
-      
-      klass.register_custom_field_type(field.name, field.type.to_sym)
-      
-      klass.define_method(field.name) do
-        custom_fields[field.name] 
-      end
-      
-      if field.serializers.any?
-        field.serializers.each do |serializer|
-          serializer_klass = "#{serializer}_serializer".classify.constantize
-          
-          serializer_klass.class_eval { attributes(field.name.to_sym) }
-          
-          serializer_klass.define_method(field.name) do
-            if serializer == 'topic_view'
-              object.topic.send(field.name)
-            else
-              object.send(field.name)
-            end
-          end
-        end
+  def self.list_by(attr, value)
+    self.list.select do |cf|
+      if attr == 'serializers'
+        cf.send(attr).include?(value)
+      else
+        cf.send(attr) == value
       end
     end
   end

plugin.rb

@@ -163,7 +163,30 @@ after_initialize do
   
   CustomWizard::Wizard.register_styles
     
-  CustomWizard::CustomField.register_fields
+  CustomWizard::CustomField::CLASSES.each do |klass|
+    add_model_callback(klass.to_sym, :after_initialize) do
+      CustomWizard::CustomField.list_by('klass', klass).each do |field|
+        klass.classify
+          .constantize
+          .register_custom_field_type(field.name, field.type.to_sym)
+      end
+    end
+  end
+  
+  CustomWizard::CustomField::SERIALIZERS.each do |serializer_klass|
+    "#{serializer_klass}_serializer".classify.constantize.class_eval do
+      CustomWizard::CustomField.list_by('serializers', serializer_klass).each do |field|
+        attributes(field.name.to_sym)
+        class_eval %{def #{field.name}
+          if "#{serializer_klass}" == "topic_view"
+            object.topic.custom_fields["#{field.name}"]
+          else
+            object.custom_fields["#{field.name}"]
+          end
+        end}
+      end
+    end
+  end
 
   DiscourseEvent.trigger(:custom_wizard_ready)
 end