rails - help trying to use models in sub-folders

Question

I'm using Rails 4 and ActiveAdmin with SQLite.

1. I've generated those models and moved files into folders:

app
  models
    system
       - admin_user.rb
       - customer.rb
    resources
       - document.rb

2. Added to config/application.rb:

config.autoload_paths += Dir[Rails.root.join('app', 'models', '{**/}')]

3. In the model files I just added prefix to model name:

class System::AdminUser < ActiveRecord::Base
    # Include default devise modules. Others available are:
    # :confirmable, :lockable, :timeoutable and :omniauthable
    devise :database_authenticatable,
           :recoverable, :rememberable, :trackable, :validatable
    # Include default devise modules. Others available are:
    # :confirmable, :lockable, :timeoutable and :omniauthable
    devise :database_authenticatable,
           :recoverable, :rememberable, :trackable, :validatable
end

--

So, when I try to run rake db:migrate I get this error:

LoadError: Unable to autoload constant AdminUser, expected /Users/john/testing/app/models/System/admin_user.rb to define it

Am I doing something wrong?

Answer 1

Rails is automagically able to find correctly-namespaced classes in subfolders of app/models without your having to do anything special. Since you've added subfolders of app/models to the autoload path, Rails now expects to find non-namespaced classes in those locations.

If you delete the autoload path change and define your class as Mohanraj suggested:

# app/models/system/admin_user.rb
module System
  class AdminUser
    # your code here
    # ...
  end
end

then you shouldn't have any problems.