在Rails应用程序中放置多个模型所需的帮助器方法的位置

Question

例如:

module ModelHelper
  def self.special_function(some_parameter)
    do_some_special_thing
  end
end
class Student < ActiveRecord::Base
  def to_special
    ModelHelper.special_function(a_variable_of_here)
  end
end
class Teacher < ActiveRecord::Base
  def to_special
    ModelHelper.special_function(another_variable_of_here)
  end
end

我把model_helper.rb放在哪里?

Answer 1

我通常在lib中创建一个文件并包含它。比如lib/special_model.rb:

module SpecialModel
   included do
     def to_special
       do_some_special_thing
     end
   end
end

然后在app/models/student.rb:

class Student
  include SpecialModel
end

你可能还想看看activessupport::关注一些rails在使用模块时的帮助:

http://api.rubyonrails.org/classes/ActiveSupport/Concern.html