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-rw-r--r--actionpack/lib/action_dispatch/routing/url_for.rb22
1 files changed, 19 insertions, 3 deletions
diff --git a/actionpack/lib/action_dispatch/routing/url_for.rb b/actionpack/lib/action_dispatch/routing/url_for.rb
index eb554ec383..8379d089df 100644
--- a/actionpack/lib/action_dispatch/routing/url_for.rb
+++ b/actionpack/lib/action_dispatch/routing/url_for.rb
@@ -52,9 +52,11 @@ module ActionDispatch
# argument.
#
# For convenience reasons, mailers provide a shortcut for ActionController::UrlFor#url_for.
- # So within mailers, you only have to type 'url_for' instead of 'ActionController::UrlFor#url_for'
- # in full. However, mailers don't have hostname information, and that's why you'll still
- # have to specify the <tt>:host</tt> argument when generating URLs in mailers.
+ # So within mailers, you only have to type +url_for+ instead of 'ActionController::UrlFor#url_for'
+ # in full. However, mailers don't have hostname information, and you still have to provide
+ # the +:host+ argument or set the default host that will be used in all mailers using the
+ # configuration option +config.action_mailer.default_url_options+. For more information on
+ # url_for in mailers read the ActionMailer#Base documentation.
#
#
# == URL generation for named routes
@@ -147,6 +149,20 @@ module ActionDispatch
# # => 'http://somehost.org/myapp/tasks/testing'
# url_for controller: 'tasks', action: 'testing', host: 'somehost.org', script_name: "/myapp", only_path: true
# # => '/myapp/tasks/testing'
+ #
+ # Missing routes keys may be filled in from the current request's parameters
+ # (e.g. +:controller+, +:action+, +:id+ and any other parameters that are
+ # placed in the path). Given that the current action has been reached
+ # through `GET /users/1`:
+ #
+ # url_for(only_path: true) # => '/users/1'
+ # url_for(only_path: true, action: 'edit') # => '/users/1/edit'
+ # url_for(only_path: true, action: 'edit', id: 2) # => '/users/2/edit'
+ #
+ # Notice that no +:id+ parameter was provided to the first +url_for+ call
+ # and the helper used the one from the route's path. Any path parameter
+ # implicitly used by +url_for+ can always be overwritten like shown on the
+ # last +url_for+ calls.
def url_for(options = nil)
case options
when nil