Ruby on Rails :before_filter => :only_when_user_is_logged_in

Question

Using Ruby on Rails, I want to before filter an action but only when users are logged in.

How is this possible?

Answer 1

before_filter :only_when_user_is_logged_in, :only => :the_action

Or for multiple

before_filter :only_when_user_is_logged_in, :only => [:the_action, :another_action]

On the flip side, you can also provide an :except => :this_action option

Answer 2

I think you're asking how to run a before filter only if a user is logged in. There is no built-in semantic for this, but it's easy enough to inline:

class SomeController < ApplicationController
  before_filter :do_something

  def do_something
    if logged_in?
      # the stuff you want to do
    end
  end
end

Answer 3

Before filters take an optional block which is passed the current controller instance so you could do something like this:

before_filter :do_stuff, lambda { |controller| controller.logged_in? }