Globalize Fallback does not work in production environment - ruby-on-rails

Question

I have the following I18n-Setup
config.i18n.available_locales = [:de, :en]
config.i18n.fallbacks = true
config.i18n.enforce_available_locales = true
config.i18n.default_locale = :de
I have a URL-based locale-switch:
# routes.rb
scope '(:locale)/', locale: /en|de/, defaults: {locale: 'de'} do
resources :programmes
root 'programmes#portal'
end
In my ApplicationController I set the locale as a before_filter
# application_controller.rb
before_filter :set_locale
def set_locale
I18n.locale = params[:locale] || I18n.default_locale
end
In my application.rb
config.i18n.available_locales = [:de, :en]
config.i18n.fallbacks = true
config.i18n.enforce_available_locales = true
config.i18n.default_locale = :de
I have a fallback for both of my languages (/app/initializers/globalize.rb):
Globalize.fallbacks = {:en => [:en, :de], :de => [:de, :en]}
My development.rb and production.rb don't differ in terms of I18n setup.
Now I run into the following problem:
I have a record which is only tranlsated in EN
In my development environment using locale = DE the fallback to the english title works
However, in production environment this fallback does not work.
It is not clear to my why this does not work in production environment.
Update: In the production console on my production environment the fallback seems to work as well:
irb(main):005:0* I18n.locale
=> :de
irb(main):006:0> p=Programme.find(1289)
=> #<Programme id: 1289, created_at: "2014-07-08 09:58:21", ....>
irb(main):007:0> p.title
=> "English Title"
irb(main):008:0> I18n.locale = :en
=> :en
irb(main):009:0> p.title
=> "English Title"
irb(main):010:0> I18n.locale = :something-undefined
=> :something-undefined
irb(main):011:0> p.title
=> nil
irb(main):012:0> I18n.default_locale
=> :de

Answer 1

TL;DR
# config/application.rb
require 'i18n/backend/fallbacks'
Answer
I recently had a similar error in development environment.
Here it is my relevant code setup:
# Gemfile
gem 'globalize', '5.0.1'
gem 'rails', '4.2.2'
gem 'rails-i18n', '4.0.4'
and:
# config/application.rb
config.i18n.available_locales = [:it, :en]
config.i18n.enforce_available_locales = true
config.i18n.default_locale = :it
config.i18n.fallbacks = true
With this setup i got these results:
2.2.2 :001 > Product.find_by_name('Fun Farm').translations.inspect
=> "#<ActiveRecord::Associations::CollectionProxy [#<Product::Translation id: 16, product_id: 16, locale: \"it\", created_at: \"2015-06-20 08:33:51\", updated_at: \"2015-06-20 08:33:51\", awards: \"Vincitore della <strong>Ludoteca Ideale</strong>, ...\", spot: \"Il party game per chi ha i riflessi pronti.\", synopsis: \"<p>\\n Gli animali stanno scappando dalla fattoria ...\">]>"
2.2.2 :002 > Product.find_by_name('Fun Farm').spot
=> "Il party game per chi ha i riflessi pronti."
2.2.2 :003 > I18n::locale = :en
=> :en
2.2.2 :004 > Product.find_by_name('Fun Farm').spot
=> nil
Adding:
# config/application.rb
require 'i18n/backend/fallbacks'
it works:
2.2.2 :001 > Product.find_by_name('Fun Farm').translations.inspect
=> "#<ActiveRecord::Associations::CollectionProxy [#<Product::Translation id: 16, product_id: 16, locale: \"it\", created_at: \"2015-06-20 08:33:51\", updated_at: \"2015-06-20 08:33:51\", awards: \"Vincitore della <strong>Ludoteca Ideale</strong>, ...\", spot: \"Il party game per chi ha i riflessi pronti.\", synopsis: \"<p>\\n Gli animali stanno scappando dalla fattoria ...\">]>"
2.2.2 :002 > Product.find_by_name('Fun Farm').spot
=> "Il party game per chi ha i riflessi pronti."
2.2.2 :003 > I18n::locale = :en
=> :en
2.2.2 :004 > Product.find_by_name('Fun Farm').spot
=> "Il party game per chi ha i riflessi pronti."