How do I access model and controller attributes from inside application.html.erb?

Question

I have a model an a controller for a pages resource. I need to be able to access the names of the pages and the pages and link_to from within the Application.html.erb

I have tried rendering a navigation partial. But you can't access the controller from a partial. I need to be able to render a navbar that has access the @pages variable so I can loop through them.

What's the best way to do this?

Marcelo De Polli · Accepted Answer · 2013-01-26 21:30:55Z

3

Inside your ApplicationController, app/controllers/application_controller.rb

class ApplicationController < ActionController::Base
  protect_from_forgery

  before_filter :get_pages

  protected

  def get_pages
    @pages ||= Page.all
  end

end

This way you're able to use the @pages instance variable from within any view.

By using memoization through the ||= operator you're only assigning the variable the first time you need it, so no need to worry about calling that method every time.

edited Jan 26, 2013 at 21:30

answered Jan 26, 2013 at 21:24

Marcelo De Polli

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3 Comments

user1951237 Over a year ago

Nicely done, even added variable caching there to make sure it only assigns its if it hasn't already been set. So will this work in the nav partial? A partials still a view right?

Marcelo De Polli Over a year ago

Right, this will work in any partial. That's the solution I've been using in my projects.

Marcelo De Polli Over a year ago

Glad to help. Just picking my answer as the correct one will be enough reward. :)

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