def url_for(options = nil)
      case options
      when String
        options
      when nil
        super(only_path: _generate_paths_by_default)
      when Hash
        options = options.symbolize_keys
        ensure_only_path_option(options)

        super(options)
      when ActionController::Parameters
        ensure_only_path_option(options)

        super(options)
      when :back
        _back_url
      when Array
        components = options.dup
        options = components.extract_options!
        ensure_only_path_option(options)

        if options[:only_path]
          polymorphic_path(components, options)
        else
          polymorphic_url(components, options)
        end
      else
        method = _generate_paths_by_default ? :path : :url
        builder = ActionDispatch::Routing::PolymorphicRoutes::HelperMethodBuilder.send(method)

        case options
        when Symbol
          builder.handle_string_call(self, options)
        when Class
          builder.handle_class_call(self, options)
        else
          builder.handle_model_call(self, options)
        end
      end
    end
def url_for(options = nil)
      case options
      when String
        options
      when nil
        super(only_path: _generate_paths_by_default)
      when Hash
        options = options.symbolize_keys
        ensure_only_path_option(options)

        super(options)
      when ActionController::Parameters
        ensure_only_path_option(options)

        super(options)
      when :back
        _back_url
      when Array
        components = options.dup
        options = components.extract_options!
        ensure_only_path_option(options)

        if options[:only_path]
          polymorphic_path(components, options)
        else
          polymorphic_url(components, options)
        end
      else
        method = _generate_paths_by_default ? :path : :url
        builder = ActionDispatch::Routing::PolymorphicRoutes::HelperMethodBuilder.send(method)

        case options
        when Symbol
          builder.handle_string_call(self, options)
        when Class
          builder.handle_class_call(self, options)
        else
          builder.handle_model_call(self, options)
        end
      end
    end
Returns the URL for the set of +options+ provided. This takes the
 same options as +url_for+ in Action Controller (see the
 documentation for <tt>ActionController::Base#url_for</tt>). Note that by default
 <tt>:only_path</tt> is <tt>true</tt> so you'll get the relative "/controller/action"
 instead of the fully qualified URL like "http://example.com/controller/action".

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

 ==== Relying on named routes

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

 ==== Implicit Controller Namespacing

 Controllers passed in using the +:controller+ option will retain their namespace unless it is an absolute one.

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

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

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

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

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

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

   <%= url_for(@workshop) %>
   # calls @workshop.to_param which by default returns the id
   # => /workshops/5

   # to_param can be re-defined in a model to provide different URL names:
   # => /workshops/1-workshop-name

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

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

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

   <%= url_for(action: 'index', controller: 'users') %>
   # Assuming an "admin" namespace
   # => /admin/users

   <%= url_for(action: 'index', controller: '/users') %>
   # Specify absolute path with beginning slash
   # => /users