Instance Public methods
has_named_route?(name) Link
Query if the following named route was already defined.
match(path, options = nil) Link
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
, and :id
are interpreted as URL query parameters and thus available through 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'
To match a wildcard parameter, it must have a name assigned to it. Without a variable name to attach the glob parameter to, the route can’t be parsed.
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: -> (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 requesting various HTTP verbs with a single action has security implications, you must either specify the actions in the via options or use one of the 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 usingparams[<:param>]
. In your router:resources :users, param: :name
The
users
resource here will have the following routes generated for it:GET /users(.:format) POST /users(.:format) GET /users/new(.:format) GET /users/:name/edit(.:format) GET /users/:name(.:format) PATCH/PUT /users/:name(.:format) DELETE /users/:name(.:format)
You can override
ActiveRecord::Base#to_param
of a related model to construct a URL:class User < ActiveRecord::Base def to_param name end end user = User.find_by(name: 'Phusion') user_path(user) # => "/users/Phusion"
- :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 tocall
or a string representing a controller’s action.match 'path', to: 'controller#action', via: :get match 'path', to: -> (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 withinresource(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===
(e.g.String
,Array
,Range
, etc.).match 'path/:id', constraints: { id: /[A-Z]\d{5}/ }, via: :get match 'json_only', constraints: { format: 'json' }, via: :get class PermitList def matches?(request) request.remote_ip == '1.2.3.4' end end match 'path', to: 'c#a', constraints: PermitList.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 supplyingfalse
.
mount(app, options = nil) Link
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.
# File actionpack/lib/action_dispatch/routing/mapper.rb, line 599 def mount(app, options = nil) if options path = options.delete(:at) elsif Hash === app options = app app, path = options.find { |k, _| k.respond_to?(:call) } options.delete(app) if app end raise ArgumentError, "A rack application must be specified" unless app.respond_to?(:call) raise ArgumentError, <<~MSG unless path Must be called with mount point mount SomeRackApp, at: "some_route" or mount(SomeRackApp => "some_route") MSG rails_app = rails_app? app options[:as] ||= app_name(app, rails_app) target_as = name_for_action(options[:as], path) options[:via] ||= :all match(path, { to: app, anchor: false, format: false }.merge(options)) define_generate_prefix(app, target_as) if rails_app self end