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

On 12 May 2012 02:07, Lauro Caetano <laurocaetano1@gmail.com> wrote:

I'm trying to do this:

class ApplicationController < ActionController::Base

  include MyGem

end

class TasksController < ApplicationController

  injector_to :task

  def show

    respond_with(@task)

  end

end

OK, so you're trying to automate the default behaviour for a standard controller without using scaffolding? That makes sense.

Two methods spring to mind. 

1) A generic controller than handles the methods that other controllers inherit from. You then set the variable name and class in each child controller, maybe via overloaded methods or through your injector_to method.

2) Your gem adds injector_to to ActiveController. When called it dynamically adds the standard methods to the controller. You then patch ActiveController so rather than looking for the "show" method, it looks for "injected_show", etc, which calls the scaffold code, then calls the controller-specific "show" method if there is one. That's the nicest way of doing it from an end-user point of view. 

I actually quite like this idea. If you want some help writing them Gem, let me know offlist and I'll happily help.

 

 

 

When the action 'show' is called, the "injector_to" should inject the @task for me. 

In other words, injector_to makes "Task.find(params[id])" for me in this case.

Other example: If I have this action ->

def create

  respond_with(@task)

end

the injector_to should do the hard work, instantiating the @task and saving it.

I think that I've explained better now.

2012/5/11 Jeremy Walker <jez.walker@gmail.com>

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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