url_for
url_for(options = nil)Generate a url based on the options provided, default_url_options and the routes defined in routes.rb. The following options are supported:
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:only_path - If true, the relative url is returned. Defaults to false.
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:protocol - The protocol to connect to. Defaults to ‘http’.
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:host - Specifies the host the link should be targeted at. If :only_path is false, this option must be provided either explicitly, or via default_url_options.
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:port - Optionally specify the port to connect to.
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:anchor - An anchor name to be appended to the path.
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:trailing_slash - If true, adds a trailing slash, as in “/archive/2009/”
Any other key (:controller, :action, etc.) given to url_for is forwarded to the Routes module.
Examples:
url_for :controller => 'tasks', :action => 'testing', :host=>'somehost.org', :port=>'8080' # => 'http://somehost.org:8080/tasks/testing' url_for :controller => 'tasks', :action => 'testing', :host=>'somehost.org', :anchor => 'ok', :only_path => true # => '/tasks/testing#ok' url_for :controller => 'tasks', :action => 'testing', :trailing_slash=>true # => 'http://somehost.org/tasks/testing/' url_for :controller => 'tasks', :action => 'testing', :host=>'somehost.org', :number => '33' # => 'http://somehost.org/tasks/testing?number=33'
3Notes
How to specify :only_path when non-hash options
When passing in an object, as opposed to a hash, you can't do this because url_for accepts one argument:
url_for(post, :only_path => true)
Instead, do this:
polymorphic_url(object, :routing_type => :path)
Model objects routed with :as
When providing a model object, url_for will not work if the model's routes are named using the :as option. You can instead use the named helper methods (posts_path, post_path(:id), etc.).
Passing an object as argument
It is possible to pass an instance of a record to the method. See the documentation of polymorphic_url (http://apidock.com/rails/ActionDispatch/Routing/PolymorphicRoutes).