Ruby on rails rails联合使用Unizillaize常量

我想找出外科医生和预约之间的关系

2.0.0-p195 :001 > surgeon = Surgeon.first
  Surgeon Load (0.1ms)  SELECT "surgeons".* FROM "surgeons" ORDER BY "surgeons"."id" ASC LIMIT 1
 => #<Surgeon id: 5, name: "Micheal Gorbachev", created_at: "2014-04-13 07:15:42", updated_at: "2014-04-13 07:15:42"> 

2.0.0-p195 :008 > surgeon.appointments
NameError: uninitialized constant Surgeon::Appointment

但这是有效的

2.0.0-p195:007>外科医生协会：预约

  2.0.0-p195 :007 > surgeon.association :appointments
   => #<ActiveRecord::Associations::HasManyAssociation:0x00000002a46850 
   @reflection=#<ActiveRecord::Reflection::AssociationReflection:0x000000030dc4d0 
   @macro=:has_many, @name=:appointments, @scope=nil, @options={}, 
   @active_record=Surgeon(id: integer, name: string, created_at: datetime, 
   updated_at: datetime), @plural_name="appointments", @collection=true>, 
   @owner=#<Surgeon id: 5, name: "Micheal Gorbachev", created_at: "2014-0

这是我的模型

class Surgeon < ActiveRecord::Base
       has_and_belongs_to_many :instruments

       #section 2
       has_many :appointments
       has_many :interventions, :through => :appointments
    end
    class Intervention < ActiveRecord::Base
      has_and_belongs_to_many :instruments

      #section 2
      has_many :appointments
      has_many :surgeons, :through => :appointments
    end
    class Instrument < ActiveRecord::Base
       has_and_belongs_to_many :surgeons
       has_and_belongs_to_many :interventions
    end
    class Appointments < ActiveRecord::Base

      #section 2
      belongs_to :surgeon
      belongs_to :intervention
    end

---

模型必须以单数命名，而不是复数

class Appointment < ActiveRecord::Base

---

谢谢我已经改正了。然后我重新装弹！我的控制台。但是我仍然有名称错误：未初始化的常量外科医生：：任命2.0.0-p195:006>survior.methods.grep/appoint/=>[：自动保存约会的相关记录，：验证约会的相关记录，：在添加约会之前，：在添加约会之前，：在添加约会之前，：在添加约会之前，：在添加约会之前，：在添加约会之后，：在添加约会之后，：在添加约会之后，：在添加约会之后，：在添加约会之前，：在删除约会之前，：在删除约会之前，：在删除约会之前，：在e_remove_for_约会=，：after_remove_for_约会？，：after_remove_for_约会=，：约会，：约会ID，：约会=，：约会ID=]2.0.0-p195:007>外科医生.appointment\u id name错误：未初始化的常量外科医生：：appointment尝试终止控制台并重复这些步骤。首先，我不知道控制台是否在重新加载后在新类上启动！其次，我确实知道，在从数据库重新加载之前，它实际上不会重新调整对象的斜体，请参阅