相关疑难解决方法(0)

我正在Ruby 1.9.2中编写一个定义了几个方法的模块.当调用这些方法中的任何一个时,我希望它们中的每一个首先执行某个语句.

module MyModule
  def go_forth
    a re-used statement
    # code particular to this method follows ...
  end

  def and_multiply
    a re-used statement
    # then something completely different ...
  end
end

但我想避免a re-used statement在每个方法中明确地放置该代码.有办法吗？

(如果重要的话,a re-used statement每个方法在调用时都会打印自己的名字.它会通过一些变体来实现puts __method__.)

这是我的实现,以开发方式在模型中的所有方法之前运行代码

调用"before_hook:months_used"方法需要在类的底部到ExecutionHooks才能获得在模块中加载的instance_method.我想在顶部加载实例方法

class BalanceChart < BalanceFind
 include ExecutionHooks

 attr_reader :options

 def initialize(options = {})
  @options = options
  @begin_at = @options[:begin_at]
 end

 def months_used
  range.map{|date| I18n.l date, format: :month_year}.uniq!
 end

 before_hook :months_used
end

module ExecutionHooks

def self.included(base)
 base.send :extend, ClassMethods
end

module ClassMethods
  def before
   @hooks.each do |name|
    m = instance_method(name)
    define_method(name) do |*args, &block|  

      return if @begin_at.blank? ## the code you can execute before methods

      m.bind(self).(*args, &block) ## your old code in the method of the class
    end
   end
  end …