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
  filt         


        

Answer 1

I found better way of doing that. You just need to add:

config.clear_sidebar_sections!

sidebar :filters do
  render partial: 'search'
end

And then make form inside the _search partial with the builder ActiveAdmin::FormBuilder as it did in:

https://github.com/gregbell/active_admin/blob/master/lib/active_admin/filters/forms.rb

For more information how to do it, look to this gist:

https://gist.github.com/4240801

Another idea is to create class:

module ActiveAdmin
  module Inputs
    class FilterCustomStringInput < FilterStringInput
      def input_name
        "#{super}"
      end
    end
  end
end

that will be able to invoke by as: :custom_string, but I don't like that idea, because you can find soon, that you will need to create custom_select and so on...

Answer 2

To use a custom filter, you can create a scope function and add it as search_methods in the model.

For example, on my User model:

search_methods :role_eq
scope :role_eq, -> (role) { where("? LIKE ANY(roles)", role) }

Then in users.rb, I can use my scope as a custom filter:

filter :role, label: "Roles", as: :select, collection: %w[ student teacher parent ]