Global Controller Variables in Rails

Question

I have a ChatController and an @user variable in it. On the main page I display @user.name. I also have destroy and create methods that work with ajax, so when I delete a message from my chat, @user becomes nil. To prevent problems from calling name on a nil object, I can add @user=User.find_by_id(:user_id) to every method. But this becomes tedious if I have many methods. Can I declare @user=User.find_by_id(:user_id) once and DRY up my code?

Your instance variables will last a single request, you can use a before filter to save repeating yourself. — Lee Jarvis
– Lee Jarvis, Commented Jan 2, 2012 at 18:24
@Berlin Thanks for the reply.. I just asked if any you have. — Arup Rakshit
– Arup Rakshit, Commented May 8, 2015 at 8:29

AndrewF · Accepted Answer · 2012-01-02 18:26:40Z

7

Yes, this is done in a before_filter (Documentation).

Something like:

class ChatController < ActionController::Base
  before_filter :find_user


  private
  def find_user
    @user ||= User.find_by_id(params[:user_id])
  end
end

You may also consider using Inherited Resources which automates this for you.

answered Jan 2, 2012 at 18:26

AndrewF

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