Rails Global Variables

Question

Here is my need: I have a table categories of a forum application. I need a variable that I can use in my app/views/layouts/application.html.erb so I can create a dropdown in the navbar with all categories in all the pages.

There's just one way I saw this as possible but as I am new to Rails I don't think it is the best, that is creating a $categories = Category.all. But as I said, it looks dangerous.

What would the best way to solve my problem?

frank184 · Accepted Answer · 2016-11-25 20:08:01Z

2

You need to get data into app/views/layouts/application.html.erb?

There's a controller just for that!

It's called ApplicationController.

In your ApplicationController do the following:

class ApplicationController < ActionController::Base
  before_action :set_categories

  # stuff..

  private

  def set_categories
    @categories = Category.all
  end
end

Now you have access to a @categories instance variable throughout your application code, including application layout.

edited Nov 25, 2016 at 20:08

answered Nov 25, 2016 at 19:32

frank184

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