Localization

MongoDB inherently supports localization and in turn, so does Mongoid. MongoDB saves localized information in a hash. We can set a fallback to a default locale by setting an option in the Rails environment, that is, development.rb under config/environments as config.i18n.fallbacks = true. It's pretty straightforward. First let's configure a localized field.

class Book
  include Mongoid::Document

  #...
  field :currency, localize: true
end

Now we can play around with this localized field.

irb> b = Book.first
 => #<Book _id: 515c634c45db7c9233000001, t(title): nil, price: nil, page_count: nil, published_date: 2013-25-06 00:00:00 UTC, is_best_seller: false, awards: ["Booker Prize", "Pulitzer Prize"], reviews: nil, currency: nil, author_id: nil>
irb> I18n.locale
 => :en 
irb> b.currency = "GBP"
 => "GBP" 
irb> b.save
 => true 
irb> I18n.locale = :hi
 => :hi 
irb> b.currency = 'INR'
 => "INR" 
irb> b.save
 => true

Now if we fetch the...