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# Controller::Actions Actions let you match path patterns in your controller and execute code. In your `controller.rb` simply add: ```ruby prepend Actions ``` If you are adding multiple things, like rewriting, they should come earlier in the chain, e.g: ```ruby prepend Rewrite, Actions ``` A simple CRUD controller might look like: ```ruby prepend Actions on 'index' do @users = User.all end on 'new' do |request| @user = User.new if request.post? @user.update_attributes(request.params['user']) redirect! "index" end end on 'edit' do |request| @user = User.find(request.params['id']) if request.post? @user.update_attributes(request.params['user']) redirect! "index" end end on 'delete' do |request| User.find(request.params['id']).destroy redirect! "index" end ``` ## Path Matching Path matching works from right to left, and '**' is a greedy operator. Controllers are invoked with a path relative to the controller's `URI_PATH`, so all lookups are relative to the controller. <dl> <dt><code class="language-ruby">"*"</code></dt> <dd>Match a single path element</dd> <dt><code class="language-ruby">"**"</code></dt> <dd>Match all remaining path elements</dd> <dt><code class="language-ruby">String</code></dt> <dd>Match a named path component, e.g. <code class="language-ruby">"edit"</code>.</dd> <dt><code class="language-ruby">Symbol</code></dt> <dd>Equivalent to <code class="language-ruby">["**", symbol.to_s]</code>, e.g. <code class="language-ruby">:logout</code>.</dd> </dl> ## Otherwise Matching If no action was matched, it is sometimes useful to perform some specific behaviour. You can specify this by using the otherwise handler: ```ruby otherwise do |request, path| fail! :teapot end ``` If you are doing this to perform some kind of rewriting, it may be preferable to use the [Rewrite](rewrite/) controller layer.
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