text: class TestController < ApplicationController
  def test
  @goodbay = TestClass.varible
  end
  end
  class TestClass
  @@varible = "var"
  end
  undefined method 'varible' for TestClass:Class
  @goodbay = TestClass.varible
  In Ruby, reading and writing to
  @instance variables (and
  @@class variables) of an object must be done through a method on that object. For example:
  class TestClass @@variable = "var" def self.variable # Return the value of this variable @@variable end end p TestClass.variable #=> "var"
  Ruby has some built-in methods to create simple accessor methods for you. If you will use an instance variable on the class (instead of a class variable):
  class TestClass @variable = "var" class << self attr_accessor :variable end end
  Ruby on Rails offers a convenience method specifically for class variables:
  class TestClass mattr_accessor :variable end