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 have model WithdrawalRequest which belongs to User model.

For filtering withdrawal requests by user's email need write:

filter :user_id, :as => :select, :collection => User.all.map {|user| [user.email, user.id]}

Answer 2

This worked for me:

In my model

  scope :active, -> { where(inactive_at: nil) }
  scope :inactive, -> { where.not(inactive_at: nil) }

  ...

  ransacker :listing_status, formatter: proc{ |status|
    ids = status == 'Active' ? active.ids : inactive.ids
    ids = ids.present? ? ids : nil
  }, splat_params: true do |parent|
    parent.table[:id]
  end

In my admin file

filter :listing_status_in, as: :select, collection: %w(Active Inactive), label: 'Listing Status'

Answer 3

Answering in 2018. ActiveAdmin uses Ransack.

On model itself you need to add Ransack formatter:

ransacker :my_custom_filter, formatter: -> (category_id) {
    ids = MyModel.where(category_id: category_id).pluck(:id) # return only id-s of returned items.
    ids.present? ? ids : nil # return ids OR nil!
} do |parent| # not sure why this is needed .. but it is :)
    parent.table[:id]
end 

In ActiveAdmin file you need to specify the rule:

filter :my_custom_filter_in, as: :select, collection: -> { Category.all } # sometimes my_custom_filter_eq - depending on what you want .. Specify different "as" when you need it. 

Answer 4

Active Admin uses the meta_search gem for its filters. ORed conditions syntax allows to combine several fields in one query, for example

Promo.metasearch(:name_or_address_contains => 'brooklyn')

In Active Admin DSL this translates to

ActiveAdmin.register Promo do

  filter :name_or_address, :as => :string

end

Answer 5

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

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

Answer 6

Another way of doing such filtering in newer version of active admin:

# app/admin/my_model.rb
filter :my_custom_filter,
as: :numeric,
label: 'Custom Filter',
filters: [:eq]

Then add following 2 functions in your model file

Your filtering logic:

def self.my_custom_filter_eq(value)
  where(column_1: value) # or probably a more complex query that uses the value inputted by the admin user
end

Registering new filter for Ransack

def self.ransackable_scopes(_auth_object = nil)
  %i(my_custom_filter_eq)
end