ruby-on-rails - NameError: 未初始化常量 -- activerecord

Question

我有两个类，Number 和 Freebie:

class Number < ActiveRecord::Base
  belongs_to :account
  has_many :freebies

end

class Freebie < ActiveRecord::Base
  belongs_to :number

  attr_accessible :name, :data

  has_attached_file :data, :path => "freebies/:id_partition/:filename"

  def to_s
    name
  end
end

我所有其他具有 has_many 和 belongs_to 关系的类都可以正常工作，但是当我调用如下内容时:

n = Number.last
n.freebies.create

我收到这个错误:

NameError: uninitialized constant Number::Freeby
    from /Users/Robby/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.8/lib/active_record/inheritance.rb:111:in `compute_type'
    from /Users/Robby/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.8/lib/active_record/reflection.rb:172:in `klass'
    from /Users/Robby/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.8/lib/active_record/associations/collection_association.rb:148:in `transaction'
    from /Users/Robby/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.8/lib/active_record/associations/collection_association.rb:431:in `create_record'
    from /Users/Robby/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.8/lib/active_record/associations/collection_association.rb:119:in `create'
    from /Users/Robby/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.8/lib/active_record/associations/collection_proxy.rb:46:in `create'
    from (irb):20
    from /Users/Robby/.rvm/gems/ruby-1.9.2-p320/gems/railties-3.2.8/lib/rails/commands/console.rb:47:in `start'
    from /Users/Robby/.rvm/gems/ruby-1.9.2-p320/gems/railties-3.2.8/lib/rails/commands/console.rb:8:in `start'
    from /Users/Robby/.rvm/gems/ruby-1.9.2-p320/gems/railties-3.2.8/lib/rails/commands.rb:41:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

我在使用 Freebie 类时遇到了一些其他问题，因为它以 ie 结尾，而 Rails 试图制作单数版本“Freeby”而不是 Freebie。不过，我不确定为什么这不起作用。

Answer 1

Rails 会自动尝试从单数形式推断单词的复数形式，反之亦然。您可能想要考虑覆盖默认的变形规则。

尝试类似于 this Stackoverflow question 中的答案的操作.