Module ActionDispatch::Routing::Mapper::Base

Query if the following named route was already defined.

Matches a url pattern to one or more routes.

You should not use the `match` method in your router without specifying an HTTP method.

If you want to expose your action to both GET and POST, use:

# sets :controller, :action and :id in params
match ':controller/:action/:id', via: [:get, :post]

Note that :controller, :action, :id are interpreted as url query parameters and thus available as params in an action.

If you want to expose your action to GET, use `get` in the router:

Instead of:

match ":controller/:action/:id"

Do:

get ":controller/:action/:id"

Two of these symbols are special, :controller maps to the controller and :action to the controller's action. A pattern can also map wildcard segments (globs) to params:

get 'songs/*category/:title', to: 'songs#show'

# 'songs/rock/classic/stairway-to-heaven' sets
#  params[:category] = 'rock/classic'
#  params[:title] = 'stairway-to-heaven'

When a pattern points to an internal route, the route's :action and :controller should be set in options or hash shorthand. Examples:

match 'photos/:id' => 'photos#show', via: [:get]
match 'photos/:id', to: 'photos#show', via: [:get]
match 'photos/:id', controller: 'photos', action: 'show', via: [:get]

A pattern can also point to a Rack endpoint i.e. anything that responds to call:

match 'photos/:id', to: lambda {|hash| [200, {}, ["Coming soon"]] }, via: [:get]
match 'photos/:id', to: PhotoRackApp, via: [:get]
# Yes, controller actions are just rack endpoints
match 'photos/:id', to: PhotosController.action(:show), via: [:get]

Because request various HTTP verbs with a single action has security implications, is recommendable use HttpHelpers instead match

Options

Any options not seen here are passed on as params with the url.

:controller

The route's controller.

:action

The route's action.

:param

Overrides the default resource identifier `:id` (name of the dynamic segment used to generate the routes). You can access that segment from your controller using params[<:param>].

:path

The path prefix for the routes.

:module

The namespace for :controller.

match 'path', to: 'c#a', module: 'sekret', controller: 'posts', via: [:get]
# => Sekret::PostsController

See Scoping#namespace for its scope equivalent.

:as

The name used to generate routing helpers.

:via

Allowed HTTP verb(s) for route.

match 'path', to: 'c#a', via: :get
match 'path', to: 'c#a', via: [:get, :post]
match 'path', to: 'c#a', via: :all

:to

Points to a Rack endpoint. Can be an object that responds to call or a string representing a controller's action.

match 'path', to: 'controller#action', via: [:get]
match 'path', to: lambda { |env| [200, {}, ["Success!"]] }, via: [:get]
match 'path', to: RackApp, via: [:get]

:on

Shorthand for wrapping routes in a specific RESTful context. Valid values are :member, :collection, and :new. Only use within resource(s) block. For example:

resource :bar do
  match 'foo', to: 'c#a', on: :member, via: [:get, :post]
end

Is equivalent to:

resource :bar do
  member do
    match 'foo', to: 'c#a', via: [:get, :post]
  end
end

:constraints

Constrains parameters with a hash of regular expressions or an object that responds to matches?. In addition, constraints other than path can also be specified with any object that responds to === (eg. String, Array, Range, etc.).

match 'path/:id', constraints: { id: /[A-Z]\d{5}/ }, via: [:get]

match 'json_only', constraints: { format: 'json' }, via: [:get]

class Blacklist
  def matches?(request) request.remote_ip == '1.2.3.4' end
end
match 'path', to: 'c#a', constraints: Blacklist.new, via: [:get]

See Scoping#constraints for more examples with its scope equivalent.

:defaults

Sets defaults for parameters

# Sets params[:format] to 'jpg' by default
match 'path', to: 'c#a', defaults: { format: 'jpg' }, via: [:get]

See Scoping#defaults for its scope equivalent.

:anchor

Boolean to anchor a match pattern. Default is true. When set to false, the pattern matches any request prefixed with the given path.

# Matches any request starting with 'path'
match 'path', to: 'c#a', anchor: false, via: [:get]

:format

Allows you to specify the default value for optional format segment or disable it by supplying false.

Mount a Rack-based application to be used within the application.

mount SomeRackApp, at: "some_route"

Alternatively:

mount(SomeRackApp => "some_route")

For options, see match, as mount uses it internally.

All mounted applications come with routing helpers to access them. These are named after the class specified, so for the above example the helper is either some_rack_app_path or some_rack_app_url. To customize this helper's name, use the :as option:

mount(SomeRackApp => "some_route", as: "exciting")

This will generate the exciting_path and exciting_url helpers which can be used to navigate to this mounted app.

You can specify what Rails should route “/” to with the root method:

root to: 'pages#main'

For options, see match, as root uses it internally.

You can also pass a string which will expand

root 'pages#main'

You should put the root route at the top of config/routes.rb, because this means it will be matched first. As this is the most popular route of most Rails applications, this is beneficial.