How to add custom filter to Active Admin?

Question

Active Admin allows me to define filters that are displayed on the index page like so:

ActiveAdmin.register Promo do    filter :name   filter :address   filter :city   filter :state   filter :zip  end 

I would like to combine all the fields above into one, so that I can search for Promos that contain the search string in name or full address. My model already has a named scope that I can use:

class Promo < ActiveRecord::Base   scope :by_name_or_full_address, lambda { |q| where('name LIKE :q OR address LIKE :q OR city LIKE :q OR state LIKE :q OR zip LIKE :q', :q => "%#{q}%") } end 

Answer 1

Active admin uses metasearch. For example you can do this:

filter :"subscription_billing_plan_name" , :as => :select, :collection => BillingPlan.all.map(&:name)