The tasks in the rails task namespace is deprecated in favor of app namespace.

(e.g. `rails:update` and `rails:template` tasks is renamed to `app:update` and `app:template`.)

guides/source/configuring.md

@@ -550,7 +550,7 @@ There are a few configuration options available in Active Support:
 
 * `config.active_support.time_precision` sets the precision of JSON encoded time values. Defaults to `3`.
 
-* `ActiveSupport.halt_callback_chains_on_return_false` specifies whether Active Record and Active Model callback chains can be halted by returning `false` in a 'before' callback. When set to `false`, callback chains are halted only when explicitly done so with `throw(:abort)`. When set to `true`, callback chains are halted when a callback returns false (the previous behavior before Rails 5) and a deprecation warning is given. Defaults to `true` during the deprecation period. New Rails 5 apps generate an initializer file called `callback_terminator.rb` which sets the value to `false`. This file is *not* added when running `rake rails:update`, so returning `false` will still work on older apps ported to Rails 5 and display a deprecation warning to prompt users to update their code.
+* `ActiveSupport.halt_callback_chains_on_return_false` specifies whether Active Record and Active Model callback chains can be halted by returning `false` in a 'before' callback. When set to `false`, callback chains are halted only when explicitly done so with `throw(:abort)`. When set to `true`, callback chains are halted when a callback returns false (the previous behavior before Rails 5) and a deprecation warning is given. Defaults to `true` during the deprecation period. New Rails 5 apps generate an initializer file called `callback_terminator.rb` which sets the value to `false`. This file is *not* added when running `rails app:update`, so returning `false` will still work on older apps ported to Rails 5 and display a deprecation warning to prompt users to update their code.
 
 * `ActiveSupport::Logger.silencer` is set to `false` to disable the ability to silence logging in a block. The default is `true`.
 

guides/source/rails_application_templates.md

@@ -22,11 +22,11 @@ $ rails new blog -m ~/template.rb
 $ rails new blog -m http://example.com/template.rb
 ```
 
-You can use the task `rails:template` to apply templates to an existing Rails application. The location of the template needs to be passed in to an environment variable named LOCATION. Again, this can either be path to a file or a URL.
+You can use the task `app:template` to apply templates to an existing Rails application. The location of the template needs to be passed in to an environment variable named LOCATION. Again, this can either be path to a file or a URL.
 
 ```bash
-$ bin/rails rails:template LOCATION=~/template.rb
-$ bin/rails rails:template LOCATION=http://example.com/template.rb
+$ bin/rails app:template LOCATION=~/template.rb
+$ bin/rails app:template LOCATION=http://example.com/template.rb
 ```
 
 Template API

guides/source/upgrading_ruby_on_rails.md

@@ -44,13 +44,13 @@ TIP: Ruby 1.8.7 p248 and p249 have marshaling bugs that crash Rails. Ruby Enterp
 
 ### The Rake Task
 
-Rails provides the `rails:update` rake task. After updating the Rails version
+Rails provides the `app:update` rake task. After updating the Rails version
 in the Gemfile, run this rake task.
 This will help you with the creation of new files and changes of old files in an
 interactive session.
 
 ```bash
-$ rake rails:update
+$ rails app:update
    identical  config/boot.rb
        exist  config
     conflict  config/routes.rb

railties/CHANGELOG.md

@@ -1,3 +1,8 @@
+*   The tasks in the rails task namespace is deprecated in favor of app namespace.
+    (e.g. `rails:update` and `rails:template` tasks is renamed to `app:update` and `app:template`.)
+
+    *Ryo Hashimoto*
+
 *  Enable HSTS with IncludeSudomains header for new applications.
 
    *Egor Homakov*, *Prathamesh Sonpatki*

railties/lib/rails/app_loader.rb

@@ -16,7 +16,7 @@ like any other source code, rather than stubs that are generated on demand.
 Here's how to upgrade:
 
   bundle config --delete bin    # Turn off Bundler's stub generator
-  rake rails:update:bin         # Use the new Rails 4 executables
+  rails app:update:bin          # Use the new Rails 5 executables
   git add bin                   # Add bin/ to source control
 
 You may need to remove bin/ from your .gitignore as well.

railties/lib/rails/tasks/framework.rake

@@ -1,4 +1,6 @@
-namespace :rails do
+require 'active_support/deprecation'
+
+namespace :app do
   desc "Update configs and some other initially generated files (or use just update:configs or update:bin)"
   task update: [ "update:configs", "update:bin" ]
 
@@ -66,3 +68,15 @@ namespace :rails do
     end
   end
 end
+
+namespace :rails do
+  %i(update template templates:copy update:configs update:bin).each do |task_name|
+    task "#{task_name}" do
+      ActiveSupport::Deprecation.warn(<<-MSG.squish)
+        Running #{task_name} with the rails: namespace is deprecated in favor of app.
+        Run e.g. bin/rails app:#{task_name} instead."
+      MSG
+      Rake.application.invoke_task("app:#{task_name}")
+    end
+  end
+end

railties/test/application/rake_test.rb

@@ -369,7 +369,7 @@ module ApplicationTests
 
     def test_copy_templates
       Dir.chdir(app_path) do
-        `bin/rails rails:templates:copy`
+        `bin/rails app:templates:copy`
         %w(controller mailer scaffold).each do |dir|
           assert File.exist?(File.join(app_path, 'lib', 'templates', 'erb', dir))
         end
@@ -384,7 +384,7 @@ module ApplicationTests
       app_file "template.rb", ""
 
       output = Dir.chdir(app_path) do
-        `bin/rails rails:template LOCATION=template.rb`
+        `bin/rails app:template LOCATION=template.rb`
       end
 
       assert_match(/Hello, World!/, output)