module ActionView::Helpers::UrlHelper

# => javascript:history.back()
# if request.env["HTTP_REFERER"] is not set or is blank
<%= url_for(:back) %>

# => http://www.example.com
# if request.env["HTTP_REFERER"] is set to "http://www.example.com"
<%= url_for(:back) %>

# => http://www.example.com
<%= url_for("http://www.example.com") %>

# => /workshops/5
# calls @workshop.to_s
<%= url_for(@workshop) %>

# => /workshops
# relies on Workshop answering a persisted? call (and in this case returning false)
<%= url_for(Workshop.new) %>

# => /testing/jump/#tax&ship
<%= url_for(:action => 'jump', :anchor => 'tax&ship') %>

# => /messages/play/#player
<%= url_for(:action => 'play', :anchor => 'player') %>

# => https://www.railsapplication.com/members/login/
<%= url_for(:action => 'login', :controller => 'members', :only_path => false, :protocol => 'https') %>

# => /books/find
<%= url_for(:action => 'find', :controller => 'books') %>

# => /blog/
<%= url_for(:action => 'index') %>
==== Examples

+admin_workshop_path+ you'll have to call that explicitly (it's impossible for +url_for+ to guess that route).
a Workshop object will attempt to use the +workshop_path+ route. If you have a nested route, such as
you'll trigger the named route for that record. The lookup will happen on the name of the class. So passing
If you instead of a hash pass a record (like an Active Record or Active Resource) as the options parameter,

==== Relying on named routes

* :password - Inline HTTP authentication (only plucked out if :user is also present).
* :user - Inline HTTP authentication (only plucked out if :password is also present).
* :protocol - Overrides the default (current) protocol if provided.
* :host - Overrides the default (current) host if provided.
is currently not recommended since it breaks caching.
* :trailing_slash - If true, adds a trailing slash, as in "/archive/2005/". Note that this
* :only_path - If true, returns the relative URL (omitting the protocol, host name, and port) (true by default unless :host is specified).
* :anchor - Specifies the anchor name to be appended to the path.
==== Options

instead of the fully qualified URL like "http://example.com/controller/action".
:only_path is true so you'll get the relative "/controller/action"
documentation for ActionController::Base#url_for). Note that by default
same options as +url_for+ in Action Controller (see the
Returns the URL for the set of +options+ provided. This takes the

def url_for(options = {})
  options ||= {}
  url = case options
  when String
    options
  when Hash
    options = options.symbolize_keys.reverse_merge!(:only_path => options[:host].nil?)
    super
  when :back
    controller.request.env["HTTP_REFERER"] || 'javascript:history.back()'
  else
    polymorphic_path(options)
  end
  url
end