How to write rails like before_filter and after_filter for a stand alone ruby program

I have been given an exercise to write code for rails like before_filter an开发者_如何学编程d after_filter for a stand alone Ruby program. Not surprisingly I don't know how to write.

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The simplest way to do this would be to use ActiveModel::Callbacks (you can require ActiveModel by itself outside of Rails), then you get all the niceness without having to mess about implementing it yourself.

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I guess you just started learning rails. Go through the filters section of this link

http://guides.rubyonrails.org/action_controller_overview.html

It will be definitely good for your learning curve.

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This question, I think, has the answer to your question:

How to implement a "callback" in Ruby?