Based on one of the examples in the Rails Guides (http://guides.rubyonrails.org/association_basics.html#the-has-many-through-association) I wrote the following code:
class Patient < ActiveRecord::Base
has_many :appointments
has_many :physicians, through: :appointments
end
class Appointment < ActiveRecord::Base
belongs_to :physician
belongs_to :patient
end
class Physician < ActiveRecord::Base
has_many :appointments
has_many :patients, through: :appointments
def vips
patients.where(appointments: { vip: true })
end
def add_vip patient
appointments.create(patient: patient, vip: true)
end
def delete_vip patient
vips.delete(patient)
end
end
The problem is that if I have a physician (an instance of Physician) and a patient and then do
physician.add_vip(patient)
physician.delete_vip(patient)
the delete_vip not only deletes the association but the instance itself.
How can I delete only the association?
The association/record you want to delete is the Appointment not the Patient. You are creating an appointment in add_vip and should be removing an appointment in delete_vip.
# Deletes all appointments for that patient without destroying the patient itself.
def delete_vip patient
appointments.where(patient: patient, vip: true).delete_all
end
Collected from the Internet
Please contact [email protected] to delete if infringement.
Comments