How to use ActiveAdmin on models using has_many through association?

Question

I am using ActiveAdmin gem in my project.

I have 2 models using has_many through association. The database schema looks exactly the same as the example in RailsGuide

Answer 1

@monfresh @tomblomfield you can do

has_many :appointments, ->{ includes(:patients) }, :through => :patients

in the physicians model

...or, I'm not sure if you can use it with formtastic but you could make the scope optional with something like

has_many :appointments :through => :patients do
  def with_patients
    includes(:patients)
  end
end

and appointment.patient wont n+1 anymore