ruby-on-rails-3 - has_many :through NameError: uninitialized constant

Question

我只想制作一个小的连接表，最终存储有关该连接的额外信息(这就是为什么我不使用HABTM的原因)。从关联的rails文档中，我创建了以下模型:

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
    t.datetime "updated_at", :null => false
  end

  create_table "physicians", :force => true do |t|
    t.string   "name"
    t.datetime "created_at", :null => false
    t.datetime "updated_at", :null => false
  end

end

当我在控制台中并创建一个医生和患者实例时:

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

并尝试将一个关联到另一个

@physician.patients << @patient

我懂了

NameError: uninitialized constant Physician::Patients

之前已经询问过有关此示例的问题，但没有一个解决我的情况。有任何想法吗？

谢谢，
尼尔，新手。

Answer 1

您的belongs_to模型中的Appointment调用应采用单数形式，而不是复数形式:

class Appointment < ActiveRecord::Base
  belongs_to :physician
  belongs_to :patient
end