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I have a question concerning active record association, referring to this part of the rails documentation: http://guides.rubyonrails.org/association_basics.html#the-has_many-through-association if we have three models: class Physician < ActiveRecord::Base has_many :appointments has_many :patients, :through => :appointments end class Appointment < ActiveRecord::Base belongs_to :physician belongs_to :patient end class Patient < ActiveRecord::Base has_many :appointments has_many :physicians, :through => :appointments end The documentation says that the collection of join models can be managed via the api this way: physician.patients = patients but what if the appointment model, like in the linked example, has a field called appointment_date and I want to create a new appointment given the Physician and the Patient at a specific date? The following code will create a record in the appointment table, but how to populate the appointment_date too in the third step? physician = Physician.first patient = Patients.first physician.patients << patient does something like this exists? physician.patients.create( :patient => patient, 'appointment.appointment_time' => appointment_time )

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