Custom action for RailsAdmin

rails_admin_approve_review.rb

require 'rails_admin/config/actions'
require 'rails_admin/config/actions/base'

module RailsAdminApproveReview
end

module RailsAdmin
  module Config
    module Actions
      class ApproveReview < RailsAdmin::Config::Actions::Base
       register_instance_option :visible? do
          authorized? && !bindings[:object].approved
        end

        register_instance_option :member do
          true
        end

        register_instance_option :link_icon do
          'icon-check'
        end

        register_instance_option :controller do
         Proc.new do
           @object.update_attribute(:approved, true)
           flash[:notice] = "You have approved the review titled: #{@object.title}."

           redirect_to back_or_index
         end
       end
      end
    end
  end
end