[Rails] Re: How to "intercept" each action call?

I don't understand your exact request, but let's see if this helps you. 

You can run filters before every action call. Inside the filter method/class, you can call your gem's methods. Also, they can modify the params hash. 

See this for two examples, one showing a filter method, and another a filter class.

http://stackoverflow.com/questions/2913113/access-params-and-local-attributes-in-static-class-as-filter

Dheeraj Kumar

On Saturday 12 May 2012 at 6:20 AM, Jeremy Walker wrote:

On 12 May 2012 01:48, Lauro Caetano <laurocaetano1@gmail.com> wrote:

Thanks for your help Dheeraj, but I'm trying to do something like Responders.

Responders has a respond_to :html in controllers, that is used in each action call to respond_with.

The thing is: call a specific method that is located inside my gem for every action call. This method should be able to modify the attribute that was passed.

I have no idea to make this work.

Can you give an example of this working, please? I don't understand what you mean by "the attribute that was passed". What modifications is it going to make?

 

2012/5/11 Dheeraj Kumar <a.dheeraj.kumar@gmail.com>

You need a before_filter.

http://edgeguides.rubyonrails.org/action_controller_overview.html#filters

Dheeraj Kumar

On Saturday 12 May 2012 at 5:53 AM, Lauro Caetano wrote:

Hi! 

I'm a RoR beginner and I'm trying to make a gem that can "intercepts" all action from my controllers.

I would like to do something like that:

class ApplicationController < ActionController::Base

  include MyGem

end

class MyController < ApplicationController

  do_something_to :some_attribute

  def index

    respond_with(@some_attribute)

  end

end

In each call of index or other action from MyController, I want that MyGem execute "do_something_to" modifying the value of "some_attribute". Is it possible?

Thanks,

Lauro Caetano

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