Add a route/action to one of ActiveAdmin base controllers?

Question

I have a search collection action which I want to be accessible and overridable by all of my resource controllers in ActiveAdmin. It's trivial to create controller actions in a single Active Admin resource with the following code:

collection_action :autocomplete_user_last_name, method: :get

  def autocomplete_user
    term  = params[:term]
    users = User.where('first_name LIKE ? OR last_name LIKE ? OR email LIKE ?', "%#{term}%", "%#{term}%", "%#{term}%").order(:first_name)
    render json: users.map { |user|
      {
        id:            user.id,
        label:         user.full_name,
        value:         user.full_name
      }
    }
  end

But how would I create a similar action within the ActiveAdmin base controller? Within Rails, ApplicationController behaves just like any other controller where we can create routes, actions, helper methods, etc., however, I only want this action to be scoped to Active Admin, not my entire App. Is there an equivalent to ApplicationController in ActiveAdmin?

Looking through the AA code, I found the following base controllers which are the superclasses of all resource controllers:

ActiveAdmin::PageController
ActiveAdmin::BaseController
ActiveAdmin::ResourceController

However, the collection and member actions aren't defined within these classes.

Dan Crews Dan Crews · Accepted Answer · 2016-04-02T01:39:31

I believe that all AA resource controllers inherit from `ActiveAdmin::ResourceController'. See documentation here Class: ActiveAdmin::ResourceController

I'm working from memory here, but I would start by wrapping your controller code in active_admin.rb with the following:

ActiveAdmin::ResourceController.class_eval do

  collection_action :autocomplete_user_last_name, method: :get do

    def autocomplete_user
      term  = params[:term]
      users = User.where('first_name LIKE ? OR last_name LIKE ? OR email LIKE ?', "%#{term}%", "%#{term}%", "%#{term}%").order(:first_name)
      render json: users.map { |user|
        {
          id:            user.id,
          label:         user.full_name,
          value:         user.full_name
        }
      }
    end
  end
end

Add a route/action to one of ActiveAdmin base controllers?

2 Answers