title: DRY method for ActiveAdmin
body: <p>I have a number of shared DSL code in ActiveAdmin; I have looked into a number of ways to share the code, some of which included creating a module that I include in the resource and others that included, adding the path to the Active Admin initializers. </p>
  
  <p>However, I've found that nothing is working. I think there should be a simple way to just share similar code across the resources -- and by code it is really DSL including Arbre and other domain specific language. </p>
  
  <p>Here are the kinds of things I hope to share across the board: </p>
  
  <pre><code> index do
     selectable_column
     id_column
     column :email
     column :current_sign_in_at
     column :sign_in_count
     column :created_at
     actions
   end
  
  
   filter :email
   filter :current_sign_in_at
   filter :sign_in_count
   filter :created_at
  
  
   menu false
  
   scope :active
   scope :inactive
   scope :all_items, :default =&gt; true
  
    member_action :toggle_activate, method: :get do 
    ...
    end
  </code></pre>
  
  <p>Any help will be greatly appreciated. I definitely want to be a DRY coder. </p>