ActiveAdmin forms (new/edit) belongs_to association?

Question

I use Active Admin gem for Ruby on Rails. I have modules Team and Coach, which have a has_many and belongs_to relationship.

class Team < ActiveRecord::Base
  belongs_to :coach
end

class Coach < ActiveRecord::Base
  has_many :teams
end

I figured out how to display first name and last name on index and show page (i did it like that:)

  index do
    column :name
    column "Coach" do |team|
      team.coach.firstname + " " + team.coach.lastname
    end  
     default_actions
  end

What i want is how to display first name and last name of coach in Team form (new and edit page) in dropdown menu? Please help me with this.

Answer 1

Can you try this

f.input :coach_name, :as => :select, :collection => Coach.all.map {|u| [u.firstname, u.id]}, :include_blank => false