Ruby: Adding things to initialize method through modules
There are a few ways you can do this. This example will redefine the initialize method and add whatever extra code you want:
module MyModule def self.included(base) # built-in Ruby hook for modules base.class_eval do original_method = instance_method(:initialize) define_method(:initialize) do |*args, &block| original_method.bind(self).call(*args, &block) @a.push 4 # (your module code here) end end endendclass Test attr_accessor :a def initialize @a = [1, 2, 3] end # It must be included after the `initialize` # definition or the module won't find the method: include MyModuleend However:I think what you really want is subclassing. If you have a lot of classes with similar behavior, as it seems you do, ask yourself if there is a natural abstract parent class. Can you explain what you did with super and why it didn't work?