class Physician < ActiveRecord::Base
  has_many :appointments
  has_many :patients,:through => :appointments
end
 
class Patient < ActiveRecord::Base
  has_many :appointments
  has_many :physicians,:through => :appointments
end
 
class Appointment < ActiveRecord::Base
  belongs_to :physicians
  belongs_to :patients
end

我的架构如下所示：

ActiveRecord::Schema.define(:version => 20130115211859) do
 
  create_table "appointments",:force => true do |t|
    t.datetime "date"
    t.datetime "created_at",:null => false
    t.datetime "updated_at",:null => false
    t.integer  "patient_id"
    t.integer  "physician_id"
  end
 
  create_table "patients",:force => true do |t|
    t.string   "name"
    t.datetime "created_at",:null => false
  end
 
  create_table "physicians",:null => false
  end
 
end

当我在控制台中,我创建了一名医师和病人的实例：

@patient = Patient.create!
@physician = Physician.create!

并试图将一个与另一个相关联

@physician.patients << @patient

我得到

NameError: uninitialized constant Physician::Patients

有关此示例的问题之前已经提出过,但没有一个解决我的情况.有任何想法吗？

谢谢,
Neil,rails newbie.