Ruby on Rails: Where to define global constants?

Question

I\'m just getting started with my first Ruby on Rails webapp. I\'ve got a bunch of different models, views, controllers, and so on.

I\'m wanting to find a good plac

Answer 1

Some options:

Using a constant:

class Card
  COLOURS = ['white', 'blue', 'black', 'red', 'green', 'yellow'].freeze
end

Lazy loaded using class instance variable:

class Card
  def self.colours
    @colours ||= ['white', 'blue', 'black', 'red', 'green', 'yellow'].freeze
  end
end

If it is a truly global constant (avoid global constants of this nature, though), you could also consider putting a top-level constant in config/initializers/my_constants.rb for example.