Question

Using Ruby and Haml, I have a property which is cost. I believe (im new to ruby) that it will be a Float

At the moment the below line outputs my decimal in format like 4.5 instead of 4.50, which is what I want.

%span.value= "£#{event.beers.first.cost)}"

This is my class file for beers.

class Beer
  include Mongoid::Document
  embeds_many :ratings

  field :name, type: String
  field :country, type: Country
  field :cost, type: Float
  field :photos, type: PhotoArray, default: PhotoArray.new
end

Answer 1

See the string formatting method, the Kernel::sprintf documentation has all of the arguments for it.

In this case, you would want to do %span.value= "%%pound;%.2f" % event.beers.first.cost to get 4.50 rather than 4.5.