add scope to form select in active_admin

Question

I have a select field in an active_admin form which is an associated activerecord relation Travel and I would only like the travels to appear that have a status = "active" . Any idea how I can create a scope for this to be used only on the active record form?

Answer 1

As you can see on README , ActiveAdmin uses Formtastic to build forms. In Formtastic docs , you can see, under Usage title, how to work with collections.

So, in your Travel model you need a scope (or maybe, a class method returning an ActiveRecord::Relation )

class Travel < ActiveRecord::Base
  scope :actives, where(status: 'active')
end

Then in your ActiveAdmin form you can use that scope on :collection option

form do |f|
  f.inputs "a nice title" do
    f.input :travel_id, as: :select, collection: Travel.actives
  end
end

Maybe you will need to format the scope results. Doing something like this:

Travel.actives.map{|t| [t.name,t.id]}