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Ruby on Rails NameError:未初始化的常量

[英]Ruby on Rails NameError: uninitialized constant

我只是建立了一個新的遷移和模型關系,並且在控制台中測試表之間的關系時收到以下錯誤:NameError:未初始化的常量。

有人知道哪里出了問題嗎?

謝謝

編輯:

這是錯誤

NameError: uninitialized constant Profile::ProfileNotification
  from C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:105:in `const_missing'
  from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2199:in `compute_type'
  from C:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/core_ext/kernel/reporting.rb:11:in `silence_warnings'
  from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/base.rb:2195:in `compute_type'
  from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/reflection.rb:156:in `send'
  from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/reflection.rb:156:in `klass'
  from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/reflection.rb:187:in `quoted_table_name'
  from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/associations/has_many_association.rb:97:in `construct_sql'
  from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/associations/association_collection.rb:21:in `initialize'
  from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/associations.rb:1300:in `new'
  from C:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/associations.rb:1300:in `profile_notifications'
  from (irb):3

來自ProfileNotification遷移的代碼:

class CreateProfileNotifications < ActiveRecord::Migration
  def self.up
    create_table :profile_notifications do |t|
      t.integer :profile_id, :null => false
      t.integer :notification_id, :null => false
      t.string :notification_text
      t.boolean :checked, :default => false
      t.boolean :update_reply, :default => false
      t.boolean :opinion_reply, :default => false
      t.boolean :message_reply, :default => false
      t.boolean :pm, :default => false
      t.boolean :accepted_friend, :default => false
      t.boolean :accepted_supporter, :default => false
      t.timestamps
    end
  end

  def self.down
    drop_table :profile_notifications
  end
end

好吧,我發現了問題所在。 當我運行ruby腳本/生成模型時,我在鍵入ruby腳本/生成模型ProfileNotifications。 當我輸入ruby腳本/生成模型ProfileNotification(單數)時,它起作用了。 命名約定使我喪命。 感謝您的所有幫助。

中斷是因為您引用的Profile::ProfileNotification不存在。

Rails認為這是一個位於Profile命名空間中的名為ProfileNotification的模型,但是您的注釋表明Profile是另一個模型類,而不是命名空間。

基於您發布的遷移,我認為您對一對多關系的Rails命名約定感到困惑。 這是我認為的外觀:

class CreateNotifications < ActiveRecord::Migration
  def self.up
    create_table :notifications do |t|
      t.references :profile
      t.text :body
      t.boolean :checked, :default => false
      t.boolean :update_reply, :default => false
      t.boolean :opinion_reply, :default => false
      t.boolean :message_reply, :default => false
      t.boolean :pm, :default => false
      t.boolean :accepted_friend, :default => false
      t.boolean :accepted_supporter, :default => false
      t.timestamps
    end
  end

  def self.down
    drop_table :notifications
  end
end

class Profile < ActiveRecord::Base
  has_many :notifications
end

class Notification < ActiveRecord::Base
  belongs_to :profile
end

現在,當您執行Profile.find(1).notifications您應該獲得與該概要文件相關聯的通知的列表。

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