Question

I’m creating action tracking for users in Ruby on Rails 3. And I want to have after_filter method in controllers, but I don’t know how to get current object or current action in my action_tracking method. Any solution?

# some_controller.rb
class SomeController < ApplicationController
  after_filter :action_tracking, only: [ :create, :update, :delete ]
  ...
end

# application_controller.rb
class ApplicationController < ActionController::Base
  def action_tracking
    action = <get name of action>   # create, update or delete...
    <object> = <get changed object> # event, user...
    changes = <object>.changes      # { 'title' => ["Title", "New Title"] }
    <object>.tracking.create(action, changes)
  end
end

Answer 1

def action_tracking
  action = params[:action]
  changes = changed_object.changes
  changed_object.tracking.create(action, changes)
end

# override for each controller
# there is no way to know this in a generic way, unless you use something
# like inherited_resources, or active scaffold, where the objects is "known"
def changed_object
  @user
end