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

@Jeremy:

#1 seems to be the easiest, but #2 is the best solution. 

Here's my view of how this can work:

class TasksController < ApplicationController

    # Specify which class has the generic scaffolding methods

    scaffold :my_custom_scaffold_class

    

    # or we bundle a generic class with the gem

    scaffold

    # Overriding is possible

    def show(id)

        # instance variable is already injected by our gem

        # do something with the @task

    end

end

or even

class ApplicationController < ActionController::Base

    scaffold

end

to propagate to all controllers which inherit from ApplicationController.

Dheeraj Kumar

On Saturday 12 May 2012 at 6:49 AM, Dheeraj Kumar wrote:

I understand. See the link I posted, where the OP does exactly your requirement. Here's some code:

class ApplicationController < ActionController::Base

  include MyGem

end

class TasksController < ApplicationController

  before_filter :find_task

   def find_task

      @task = Task.find(params[:id])

      # Some other operation involving MyGem if you need...

   end

  def show

    respond_with(@task)

  end

end

Dheeraj Kumar

On Saturday 12 May 2012 at 6:37 AM, Lauro Caetano 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

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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