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活动记录的简单Railtie扩展

railtie ruby ruby-on-rails

Kevin Sylvestre · 技术社区 · 14 年前

我正在创建一个Rails 3.0.3gem,但无法运行:

# attached.rb
module Attached
  require 'attached/railtie' if defined?(Rails)
  def self.include(base)
    base.send :extend, ClassMethods
  end
  module ClassMethods
    def acts_as_fail
    end
  end
end

# attached/railtie.rb
require 'attached'
require 'rails'

module Attached
  class Railtie < Rails::Railtie
    initializer 'attached.initialize' do
      ActiveSupport.on_load(:active_record) do
        ActiveRecord::Base.send :include, Attached
      end
    end
  end
end

我明白了 undefined local variable or method 'acts_as_fail' 当我加上 acts_as_fail 对我的任何人 ActiveRecord 模型。请帮忙!我对这些看似微不足道的代码感到非常失望!谢谢!

2 回复 | 直到 13 年前

Ryan Bigg Andrés Bonilla 14 年前

你在定义 self.include 当正确的方法是 self.included .

Petrik de Heus 14 年前

您可以使用 extend 直接:

# attached.rb
module Attached
  require 'attached/railtie' if defined?(Rails)
  def acts_as_fail
  end
end

# attached/railtie.rb
require 'attached'
require 'rails'

module Attached
  class Railtie < Rails::Railtie
    initializer 'attached.initialize' do
      ActiveSupport.on_load(:active_record) do
        ActiveRecord::Base.send :extend, Attached
      end
    end
  end
end

这是一本很好的读物: http://yehudakatz.com/2009/11/12/better-ruby-idioms/