添加类方法的ActiveRecord :: Base的 [英] adding class methods to ActiveRecord::Base

问题描述

我已经创建了一个实例方法，这也是一个回调（如果是有道理的），做一些东西，那是无关紧要的。我很想能够只是调用：

I have created an instance method which is also a callback (if that makes sense) which does some stuff thats irrelevant. I would love to be able to just call:

class Model < ActiveRecord::Base
  fix_camelcase_columns  
end

相反，此刻我有这样的：

Instead at the moment I have this:

def after_find
  self.class.columns.each do |column|
    self.instance_eval("def #{column.name.to_underscore}; self.#{column.name}; end;")
  end
end

我喜欢抽象的这一点，并用它在其他类。任何指针？

I would love to abstract this and use it on other classes. Any pointers?

推荐答案

好了，你可以打开的ActiveRecord :: Base的和投掷的方法有：

Well, you can open up ActiveRecord::Base and throw a method there:

class ActiveRecord::Base
  def self.fix_camelcase_columns
    define_method :after_find do 
      ...
    end
  end
end

对于一个更清洁的方式，创建模块：

For a cleaner way, create a module:

module CamelcaseFixer
  def self.included(base)
    base.extend(self)
  end

  def fix_camelcase_columns
    define_method :after_find do
      ...
    end     
  end
end

，然后在模型中做

and then in your model do

class Model < ActiveRecord::Base
  include CamelcaseFixer
  fix_camelcase_columns  
end

没有测试code，看看它是否工作。

Didn't test the code, see if it works.

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