Why :physician and :patient some with (s), and some not...? It actually
refer to the class name or table name? ** really confuse >_<. Can
someone explain it? Is it a convention of rail? Thank you.
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
It depends whether there are more than one or not. A class is the
blueprint of an instance object. Thus a physician class describes one
object, of class physician. Has many means one physician has a
collection of some other kind of object. Belongs to means a physician
can be part of
A collection of physicians for another class of object and is
therefore the other 'side' if you will.
