Don't force translations for the current locale

Globalize creates a translation for the current locale, and the only way
I've found to change this behaviour is to monkey-patch it.

The original code uses `translation.locale` instead of
`Globalize.locale`. Since `translation.locale` loads the translation
with empty attributes. It both makes the record invalid if there are
validations and it makes it almost impossible to create a record with
translations which don't include the current locale.

See also the following convertations:

https://github.com/globalize/globalize/pull/328
https://github.com/globalize/globalize/issues/468
https://github.com/globalize/globalize/pull/578
https://github.com/shioyama/mobility/wiki/Migrating-from-Globalize#blank-translations

app/helpers/globalize_helper.rb

@@ -10,12 +10,17 @@ module GlobalizeHelper
     end
   end
 
-  def display_translation?(locale)
-    locale == I18n.locale
+  def display_translation?(resource, locale)
+    if !resource || resource.translations.blank? ||
+        resource.translations.map(&:locale).include?(I18n.locale)
+      locale == I18n.locale
+    else
+      locale == resource.translations.first.locale
+    end
   end
 
-  def display_translation_style(locale)
-    "display: none;" unless display_translation?(locale)
+  def display_translation_style(resource, locale)
+    "display: none;" unless display_translation?(resource, locale)
   end
 
   def translation_enabled_tag(locale, enabled)
@@ -29,11 +34,12 @@ module GlobalizeHelper
   def enable_locale?(resource, locale)
     # Use `map` instead of `pluck` in order to keep the `params` sent
     # by the browser when there's invalid data
-    resource.translations.reject(&:_destroy).map(&:locale).include?(locale) || locale == I18n.locale
+    (resource.translations.blank? && locale == I18n.locale) ||
+      resource.translations.reject(&:_destroy).map(&:locale).include?(locale)
   end
 
-  def highlight_class(locale)
-    "is-active" if display_translation?(locale)
+  def highlight_class(resource, locale)
+    "is-active" if display_translation?(resource, locale)
   end
 
   def globalize(locale, &block)

app/helpers/translatable_form_helper.rb

@@ -74,7 +74,7 @@ module TranslatableFormHelper
     end
 
     def display_style
-      @template.display_translation_style(locale)
+      @template.display_translation_style(@object.globalized_model, locale)
     end
 
     private

app/views/admin/shared/_globalize_locales.html.erb

@@ -1,7 +1,7 @@
 <% I18n.available_locales.each do |locale| %>
   <%= link_to t("admin.translations.remove_language"), "#",
               id: "delete-#{locale}",
-              style: display_translation_style(locale),
+              style: display_translation_style(resource, locale),
               class: 'float-right delete js-delete-language',
               data: { locale: locale } %>
 
@@ -12,7 +12,7 @@
     <li class="tabs-title">
       <%= link_to name_for_locale(locale), "#",
                   style: enable_translation_style(resource, locale),
-                  class: "js-globalize-locale-link #{highlight_class(locale)}",
+                  class: "js-globalize-locale-link #{highlight_class(resource, locale)}",
                   data: { locale: locale },
                   remote: true %>
     </li>

app/views/admin/site_customization/information_texts/_globalize_locales.html.erb

@@ -1,7 +1,7 @@
 <% I18n.available_locales.each do |locale| %>
   <%= link_to t("admin.translations.remove_language"), "#",
               id: "delete-#{locale}",
-              style: display_translation_style(locale),
+              style: site_customization_display_translation_style(locale),
               class: 'float-right delete js-delete-language',
               data: { locale: locale } %>
 
@@ -12,7 +12,7 @@
     <li class="tabs-title">
       <%= link_to name_for_locale(locale), "#",
                   style: site_customization_display_translation_style(locale),
-                  class: "js-globalize-locale-link #{highlight_class(locale)}",
+                  class: "js-globalize-locale-link #{highlight_class(nil, locale)}",
                   data: { locale: locale },
                   remote: true %>
     </li>

config/initializers/globalize.rb

@@ -0,0 +1,13 @@
+module Globalize
+  module ActiveRecord
+    module InstanceMethods
+      def save(*)
+        # Credit for this code belongs to Jack Tomaszewski:
+        # https://github.com/globalize/globalize/pull/578
+        Globalize.with_locale(Globalize.locale || I18n.default_locale) do
+          super
+        end
+      end
+    end
+  end
+end

spec/features/admin/banners_spec.rb

@@ -110,6 +110,33 @@ feature 'Admin banners magement' do
     expect(page).to have_link 'Such banner many text wow link', href: 'https://www.url.com'
   end
 
+  scenario "Publish a banner with a translation different than the current locale", :js do
+    visit new_admin_banner_path
+
+    expect(page).to have_link "English"
+
+    click_link "Remove language"
+    select "Français", from: "translation_locale"
+
+    fill_in "Title", with: "En Français"
+    fill_in "Description", with: "Link en Français"
+
+    fill_in "Link", with: "https://www.url.com"
+
+    last_week = Time.current - 1.week
+    next_week = Time.current + 1.week
+
+    fill_in "Post started at", with: last_week.strftime("%d/%m/%Y")
+    fill_in "Post ended at", with: next_week.strftime("%d/%m/%Y")
+
+    click_button "Save changes"
+    click_link "Edit banner"
+
+    expect(page).to have_link "Français"
+    expect(page).not_to have_link "English"
+    expect(page).to have_field "Title", with: "En Français"
+  end
+
   scenario "Update banner color when changing from color picker or text_field", :js do
     visit new_admin_banner_path