How to implement has_many :through relationships with Mongoid and mongodb?

Question

Using this modified example from the Rails guides, how does one model a relational \"has_many :through\" association using mongoid?

The challenge is that mongoid doe

Answer 1

Just to expand on this, here's the models extended with methods that act very similar to the has_many :through from ActiveRecord by returning a query proxy instead of an array of records:

class Physician
  include Mongoid::Document
  has_many :appointments

  def patients
    Patient.in(id: appointments.pluck(:patient_id))
  end
end

class Appointment
  include Mongoid::Document
  belongs_to :physician
  belongs_to :patient
end

class Patient
  include Mongoid::Document
  has_many :appointments

  def physicians
    Physician.in(id: appointments.pluck(:physician_id))
  end
end