How to set in a middleware a variable accessible in all my application?

Question

I am using Ruby on Rails 3 and I am trying to use middlewares in order to set a variable @variable_name accessible later in controllers.

For example my midd

Answer 1

You can have a cattr_accessor :my_var in any model and set this variable from middleware by

  MyModel.my_var = 'something'

And you can access this anywhere in the application.

Answer 2

I don't know if this can be done with a Middelware. My suggestion would be this:

class ApplicationController < ActionController::Base

  protect_from_forgery

  before_filter :set_my_var

private
  def set_my_var
    @account ||= Account.find(1)
  end

end

This way all your controllers and views have access to @account

Answer 3

You can use 'env' for that. So in your middleware you do this:

def call(env)
  env['account'] = Account.find(1)
  @app.call(env)
end

You can get the value by using 'request' in your app:

request.env['account']

And please don't use global variables or class attributes as some people suggest here. That's a sure way to get yourself into troubles and really is a bad habit.

Answer 4

Have you tried creating a Ruby global variable?

def call(env)
  $account ||= Account.find(1)

  @app.call(env)
end

and

<%= debug $account %>