Rails 6.0.0rc1 try023

update I18n fallbacks configuration to be compatible with i18n 1.1.0
rails/rails#33574

Describe how to silence the deprecation warning about empty I18n
fallbacks
rails/rails#35052

app/assets/stylesheets/i18n_fallbacks.scss

@@ -0,0 +1,3 @@
+// Place all the styles related to the i18n_fallbacks controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: http://sass-lang.com/

app/controllers/i18n_fallbacks_controller.rb

@@ -0,0 +1,4 @@
+class I18nFallbacksController < ApplicationController
+  def index
+  end
+end

app/helpers/i18n_fallbacks_helper.rb

@@ -0,0 +1,2 @@
+module I18nFallbacksHelper
+end

app/views/i18n_fallbacks/index.html.erb

@@ -0,0 +1,16 @@
+<% I18n.with_locale(:de) do %>
+  <h1>I18n Fallbacks Test</h1>
+  <h2>I18n settings</h2>
+  <ul>
+    <li>I18n.default_locale = <%= I18n.default_locale %></li>
+    <li>I18n.locale = <%= I18n.locale %></li>
+    <li>I18n.fallbacks = <%= I18n.fallbacks %></li>
+  </ul>
+
+  <h2>I18n translations</h2>
+  <ul>
+    <li>morning=<%= t(:morning) %></li>
+    <li>afternoon=<%= t(:afternoon) %></li>
+    <li>night=<%= t(:night) %></li>
+  </ul>
+<% end %>

config/environments/development.rb

@@ -59,4 +59,7 @@
   # Use an evented file watcher to asynchronously detect changes in source code,
   # routes, locales, etc. This feature depends on the listen gem.
   config.file_watcher = ActiveSupport::EventedFileUpdateChecker
+
+  config.i18n.fallbacks = [{de: :ja}]
+  # config.i18n.fallbacks = [nil, {de: :ja}]
 end

config/locales/de.yml

@@ -0,0 +1,3 @@
+de:
+  night: Gute Nacht
+

config/locales/en.yml

@@ -1,33 +1,2 @@
-# Files in the config/locales directory are used for internationalization
-# and are automatically loaded by Rails. If you want to use locales other
-# than English, add the necessary files in this directory.
-#
-# To use the locales, use `I18n.t`:
-#
-#     I18n.t 'hello'
-#
-# In views, this is aliased to just `t`:
-#
-#     <%= t('hello') %>
-#
-# To use a different locale, set it with `I18n.locale`:
-#
-#     I18n.locale = :es
-#
-# This would use the information in config/locales/es.yml.
-#
-# The following keys must be escaped otherwise they will not be retrieved by
-# the default I18n backend:
-#
-# true, false, on, off, yes, no
-#
-# Instead, surround them with single quotes.
-#
-# en:
-#   'true': 'foo'
-#
-# To learn more, please read the Rails Internationalization guide
-# available at https://guides.rubyonrails.org/i18n.html.
-
 en:
-  hello: "Hello world"
+  morning: "Good Morning"

config/locales/ja.yml

@@ -0,0 +1,2 @@
+ja:
+  afternoon: こんにちは

config/routes.rb

@@ -1,3 +1,4 @@
 Rails.application.routes.draw do
+  get 'i18n_fallbacks/index'
   # For details on the DSL available within this file, see https://guides.rubyonrails.org/routing.html
 end

db/schema.rb

@@ -0,0 +1,18 @@
+# This file is auto-generated from the current state of the database. Instead
+# of editing this file, please use the migrations feature of Active Record to
+# incrementally modify your database, and then regenerate this schema definition.
+#
+# This file is the source Rails uses to define your schema when running `rails
+# db:schema:load`. When creating a new database, `rails db:schema:load` tends to
+# be faster and is potentially less error prone than running all of your
+# migrations from scratch. Old migrations may fail to apply correctly if those
+# migrations use external dependencies or application code.
+#
+# It's strongly recommended that you check this file into your version control system.
+
+ActiveRecord::Schema.define(version: 0) do
+
+  # These are extensions that must be enabled in order to support this database
+  enable_extension "plpgsql"
+
+end

test/controllers/i18n_fallbacks_controller_test.rb

@@ -0,0 +1,9 @@
+require 'test_helper'
+
+class I18nFallbacksControllerTest < ActionDispatch::IntegrationTest
+  test "should get index" do
+    get i18n_fallbacks_index_url
+    assert_response :success
+  end
+
+end