Methods
R
Instance Public methods
redirect(*args, &block)

Redirect any path to another path: 

  match "/stories" => redirect("/posts")

You can also use interpolation in the supplied redirect argument: 

  match 'docs/:article', :to => redirect('/wiki/%{article}')

Alternatively you can use one of the other syntaxes:

The block version of redirect allows for the easy encapsulation of any logic associated with the redirect in question. Either the params and request are supplied as arguments, or just params, depending of how many arguments your block accepts. A string is required as a return value. 

  match 'jokes/:number', :to => redirect do |params, request|
    path = (params[:number].to_i.even? ? "/wheres-the-beef" : "/i-love-lamp")
    "http://#{request.host_with_port}/#{path}"
  end

The options version of redirect allows you to supply only the parts of the url which need to change, it also supports interpolation of the path similar to the first example. 

  match 'stores/:name',       :to => redirect(:subdomain => 'stores', :path => '/%{name}')
  match 'stores/:name(*all)', :to => redirect(:subdomain => 'stores', :path => '/%{name}%{all}')

Finally, an object which responds to call can be supplied to redirect, allowing you to reuse common redirect routes. The call method must accept two arguments, params and request, and return a string. 

  match 'accounts/:name' => redirect(SubdomainRedirector.new('api'))

Source: show | on GitHub 

     # File actionpack/lib/action_dispatch/routing/redirection.rb, line 98
 98:       def redirect(*args, &block)
 99:         options = args.last.is_a?(Hash) ? args.pop : {}
100:         status  = options.delete(:status) || 301
101: 
102:         return OptionRedirect.new(status, options) if options.any?
103: 
104:         path = args.shift
105: 
106:         block = lambda { |params, request|
107:           (params.empty? || !path.match(/%\{\w*\}/)) ? path : (path % escape(params))
108:         } if String === path
109: 
110:         block = path if path.respond_to? :call
111: 
112:         # :FIXME: remove in Rails 4.0
113:         if block && block.respond_to?(:arity) && block.arity < 2
114:           msg = "redirect blocks with arity of #{block.arity} are deprecated. Your block must take 2 parameters: the environment, and a request object"
115:           ActiveSupport::Deprecation.warn msg
116:           deprecated_block = block
117:           block = lambda { |params, _| deprecated_block.call(params) }
118:         end
119: 
120:         raise ArgumentError, "redirection argument not supported" unless block
121: 
122:         Redirect.new status, block
123:       end