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-rw-r--r--guides/source/upgrading_ruby_on_rails.md30
1 files changed, 28 insertions, 2 deletions
diff --git a/guides/source/upgrading_ruby_on_rails.md b/guides/source/upgrading_ruby_on_rails.md
index 8ad2e2bdb4..9a667999fd 100644
--- a/guides/source/upgrading_ruby_on_rails.md
+++ b/guides/source/upgrading_ruby_on_rails.md
@@ -31,6 +31,32 @@ If your application is currently on any version of Rails older than 3.2.x, you s
The following changes are meant for upgrading your application to Rails 4.0.
+### Gemfile
+
+Rails 4.0 removed the *group :assets* from Gemfile (now you can use only :test, :development and/or :production groups). So change your Gemfile from:
+```ruby
+group :assets do
+ gem 'sass-rails', '~> 4.0.0.beta1'
+ gem 'coffee-rails', '~> 4.0.0.beta1'
+
+ # See https://github.com/sstephenson/execjs#readme for more supported runtimes
+ # gem 'therubyracer', platforms: :ruby
+
+ gem 'uglifier', '>= 1.0.3'
+end
+```
+to:
+```ruby
+gem 'sass-rails', '~> 4.0.0.beta1'
+gem 'coffee-rails', '~> 4.0.0.beta1'
+
+# See https://github.com/sstephenson/execjs#readme for more supported runtimes
+# gem 'therubyracer', platforms: :ruby
+
+gem 'uglifier', '>= 1.0.3'
+```
+**note:** don't removing the *group assets* from the Gemfile will cause your assets stop compiling
+
### vendor/plugins
Rails 4.0 no longer supports loading plugins from `vendor/plugins`. You must replace any plugins by extracting them to gems and adding them to your Gemfile. If you choose not to make them gems, you can move them into, say, `lib/my_plugin/*` and add an appropriate initializer in `config/initializers/my_plugin.rb`.
@@ -67,7 +93,7 @@ Rails 4.0 extracted Active Resource to its own gem. If you still need the featur
* Rails 4.0 has changed how errors attach with the `ActiveModel::Validations::ConfirmationValidator`. Now when confirmation validations fail, the error will be attached to `:#{attribute}_confirmation` instead of `attribute`.
-* Rails 4.0 has changed `ActiveModel::Serializers::JSON.include_root_in_json` default value to `false`. Now, Active Model Serializers and Active Record objects have the same default behaviour. This means that you can comment or remove the following option in the `config/initializers/wrap_parameters.rb` file:
+* Rails 4.0 has changed `ActiveModel::Serializers::JSON.include_root_in_json` default value to `false`. Now, Active Model Serializers and Active Record objects have the same default behavior. This means that you can comment or remove the following option in the `config/initializers/wrap_parameters.rb` file:
```ruby
# Disable root element in JSON by default.
@@ -311,7 +337,7 @@ config.assets.debug = true
Again, most of the changes below are for the asset pipeline. You can read more about these in the [Asset Pipeline](asset_pipeline.html) guide.
```ruby
-# Compress JavaScripts and CSS
+# Compress JavaScript and CSS
config.assets.compress = true
# Don't fallback to assets pipeline if a precompiled asset is missed