Обнаружена циклическая зависимость при автозагрузке константы (ActiveRecord)

Question

Я вручную указал отношения в моделях (не нашел способа автоматического их создания из ERD-модели или существующей базы данных), а затем попытался создать миграцию, содержащую FK с использованием иммигрантского жемчужина. Я получаю:

rails generate immigration AddKeys 
lib/active_support/dependencies.rb:478:in `load_missing_constant': Circular dependency detected while autoloading constant Assignment (RuntimeError) 
from /Users/nnikolo/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/gems/activesupport-4.1.5/lib/active_support/dependencies.rb:180:in `const_missing' 
from /Users/nnikolo/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/gems/activesupport-4.1.5/lib/active_support/dependencies.rb:512:in `load_missing_constant' 
from /Users/nnikolo/.rvm/gems/ruby-2.0.0-p451@railstutorial_rails_4_0/gems/activesupport-4.1.5/lib/active_support/dependencies.rb:180:in `const_missing' 

Вот код для моделей:

class Account < ActiveRecord::Base 
    include Person 
    include Contact 
    has_many :coworkers, :class_name => 'Coworker' 
    has_many :customers, :class_name => 'Customer' 
    has_many :locations, :class_name => 'Location' 
    has_many :appointment_types, :class_name => 'AppointmentType' 

    before_create :create_remember_token 
    has_secure_password 
    validates :password, length: { minimum: 6 } 
    validates :rem_notice_hrs, presence: true 
    validates :rem_notice_hrs, numericality: true 
    validates :rem_text, presence: true 
    validates :email, presence: true, length: { maximum: 255 }, 
     format: { with: VALID_EMAIL_REGEX } 

    after_initialize :init 

    def Account.new_remember_token 
    SecureRandom.urlsafe_base64 
    end 

    def Account.digest(token) 
    Digest::SHA1.hexdigest(token.to_s) 
    end 

    private 
    def init 
     if self.new_record? 
     if self.rem_notice_hrs.nil? 
      self.rem_notice_hrs = 24 
     end 
     if self.rem_text.nil? 
      if self.company.nil? 
      self.rem_text = "Dear [customer title: automatic] [customer family name: automatic], this is a reminder of your appointment with %{title} %{family_name} on [date/time]." 
      else 
      self.rem_text = "Dear [title] [customer family name], this is a reminder of your appointment with %{company} on [date/time]." 
      end 
     end 
     end 
    end 

    def create_remember_token 
     self.remember_token = User.digest(User.new_remember_token) 
    end 
end 

class Location < ActiveRecord::Base 
    belongs_to :coworker, :class_name => 'Coworker', :foreign_key => :wor_id 
    belongs_to :appointment, :class_name => 'Appointment', :foreign_key => :app_id 
    #optional deletion flag: 
    validates_inclusion_of :deleted, in: [true, false] 
end 

class Coworker < ActiveRecord::Base 
    include Person 
    validates_inclusion_of :deleted, in: [true, false] 
    belongs_to :account, :class_name => 'Account', :foreign_key => :acc_id 
    has_many :assignments 
end 

class Location < ActiveRecord::Base 
    belongs_to :coworker, :class_name => 'Coworker', :foreign_key => :wor_id 
    belongs_to :appointment, :class_name => 'Appointment', :foreign_key => :app_id 
    validates_inclusion_of :deleted, in: [true, false] 
end 

class Appointment < ActiveRecord::Base 
    belongs_to :customer, :class_name => 'Customer', :foreign_key => :cus_id 
    belongs_to :location, :class_name => 'Location', :foreign_key => :loc_id 
    belongs_to :appointment_type, :class_name => 'AppointmentType', :foreign_key => :app_type_id 
    has_many :assignments, :class_name => 'Assignment' 
    has_many :reminders, :class_name => 'Reminder' 

    validates_date :from, :on_or_after => :today 
    validates_date :till, :on_or_after => :from 
    validates_inclusion_of :deleted, in: [true, false] 

    attr_accessor :title 
end 

Некоторые из приведенных выше моделей реализуют следующие проблемы:

module Contact 
    extend ActiveSupport::Concern 
    extend ActiveModel::Naming 
    include ActiveModel::Conversion 
    include ActiveModel::Validations 
    # phone attribute 
    included do 
    validates :phone, presence: true 
    validates :phone, numericality: true 
    attr_accessor :company 
    end 
    #email regex 
    VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i 
end 

module Person 
    extend ActiveSupport::Concern 
    extend ActiveModel::Naming 
    include ActiveModel::Conversion 
    include ActiveModel::Validations 
    included do 
    # deleted flag attribute 
    attr_accessor :first_name, :family_name, :title 
    end 
end 

Можете ли вы сказать, что происходит здесь не так ?

Answer 1

Это классический пример беспорядочного копирования - я скопировал код Location.rb в Assignment.rb, отредактировал его, но забыл переименовать класс. Таким образом, я получаю две модели местоположения - в двух разных rb-файлах. Doh!