Module: ActionDispatch::Routing::Mapper::Resources
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Defined in: | actionpack/lib/action_dispatch/routing/mapper.rb |
Overview
Resource
routing allows you to quickly declare all of the common routes for a given resourceful controller. Instead of declaring separate routes for your index
, show
, #new, edit
, create
, update
, and destroy
actions, a resourceful route declares them in a single line of code:
resources :photos
Sometimes, you have a resource that clients always look up without referencing an ID. A common example, /profile always shows the profile of the currently logged in user. In this case, you can use a singular resource to map /profile (rather than /profile/:id) to the show action.
resource :profile
It’s common to have resources that are logically children of other resources:
resources :magazines do
resources :ads
end
You may wish to organize groups of controllers under a namespace. Most commonly, you might group a number of administrative controllers under an admin
namespace. You would place these controllers under the app/controllers/admin
directory, and you can group them together in your router:
namespace "admin" do
resources :posts, :comments
end
By default the :id
parameter doesn’t accept dots. If you need to use dots as part of the :id
parameter add a constraint which overrides this restriction, e.g:
resources :articles, id: /[^\/]+/
This allows any character other than a slash as part of your :id
.
Constant Summary
-
CANONICAL_ACTIONS =
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1162%w(index create new show update destroy)
-
RESOURCE_OPTIONS =
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1161[:as, :controller, :path, :only, :except, :param, :concerns]
-
VALID_ON_OPTIONS =
CANONICAL_ACTIONS holds all actions that does not need a prefix or a path appended since they fit properly in their scope level.
[:new, :collection, :member]
Instance Attribute Summary
- #shallow readonly
- #shallow? ⇒ Boolean readonly
- #api_only? ⇒ Boolean readonly private
- #nested_scope? ⇒ Boolean readonly private
- #param_constraint? ⇒ Boolean readonly private
- #resource_method_scope? ⇒ Boolean readonly private
- #resource_scope? ⇒ Boolean readonly private
Instance Method Summary
-
#collection(&block)
To add a route to the collection:
-
#draw(name)
Loads another routes file with the given
name
located inside theconfig/routes
directory. -
#match(path, *rest, &block)
Matches a URL pattern to one or more routes.
-
#member(&block)
To add a member route, add a member block into the resource block:
-
#namespace(path, options = {})
See Scoping#namespace.
- #nested(&block)
- #new(&block)
-
#resource(*resources, &block)
Sometimes, you have a resource that clients always look up without referencing an ID.
-
#resources(*resources, &block)
In Rails, a resourceful route provides a mapping between HTTP verbs and URLs and controller actions.
- #resources_path_names(options)
-
#root(path, options = {})
You can specify what
::Rails
should route “/” to with the root method: - #action_options?(options) ⇒ Boolean private
- #action_path(name) private
- #add_route(action, controller, options, _path, to, via, formatted, anchor, options_constraints) private
- #applicable_actions_for(method) private
- #apply_action_options(method, options) private
- #apply_common_behavior_for(method, resources, options, &block) private
- #canonical_action?(action) ⇒ Boolean private
- #decomposed_match(path, controller, options, _path, to, via, formatted, anchor, options_constraints) private
- #get_to_from_path(path, to, action) private
- #map_match(paths, options) private
- #match_root_route(options) private
- #name_for_action(as, action) private
- #nested_options private
- #param_constraint readonly private
- #parent_resource private
- #path_for_action(action, path) private
- #path_scope(path) private
- #prefix_name_for_action(as, action) private
- #resource_scope(resource, &block) readonly private
- #scope_action_options(method) private
- #set_member_mappings_for_resource private
- #shallow_nesting_depth private
- #shallow_scope private
- #using_match_shorthand?(path) ⇒ Boolean private
- #with_scope_level(kind) private
Instance Attribute Details
#api_only? ⇒ Boolean
(readonly, private)
[ GitHub ]
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1950
def api_only? # :doc: @set.api_only? end
#nested_scope? ⇒ Boolean
(readonly, private)
[ GitHub ]
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1830
def nested_scope? @scope.nested? end
#param_constraint? ⇒ Boolean
(readonly, private)
[ GitHub ]
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1864
def param_constraint? @scope[:constraints] && @scope[:constraints][parent_resource.param].is_a?(Regexp) end
#resource_method_scope? ⇒ Boolean
(readonly, private)
[ GitHub ]
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1826
def resource_method_scope? @scope.resource_method_scope? end
#resource_scope? ⇒ Boolean
(readonly, private)
[ GitHub ]
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1822
def resource_scope? @scope.resource_scope? end
#shallow (readonly)
[ GitHub ]# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1634
def shallow @scope = @scope.new(shallow: true) yield ensure @scope = @scope.parent end
#shallow? ⇒ Boolean
(readonly)
[ GitHub ]
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1641
def shallow? !parent_resource.singleton? && @scope[:shallow] end
Instance Method Details
#action_options?(options) ⇒ Boolean
(private)
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1799
def ( ) [:only] || [:except] end
#action_path(name) (private)
[ GitHub ]# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1896
def action_path(name) @scope[:path_names][name.to_sym] || name end
#add_route(action, controller, options, _path, to, via, formatted, anchor, options_constraints) (private)
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 2037
def add_route(action, controller, , _path, to, via, formatted, anchor, ) path = path_for_action(action, _path) raise ArgumentError, "path is required" if path.blank? action = action.to_s default_action = .delete(:action) || @scope[:action] if /^[\w\-\/]+$/.match?(action) default_action ||= action.tr("-", "_") unless action.include?("/") else action = nil end as = if ! .fetch(:as, true) # if it's set to nil or false .delete(:as) else name_for_action( .delete(:as), action) end path = Mapping.normalize_path URI::RFC2396_PARSER.escape(path), formatted ast = Journey::Parser.parse path mapping = Mapping.build(@scope, @set, ast, controller, default_action, to, via, formatted, , anchor, ) @set.add_route(mapping, as) end
#applicable_actions_for(method) (private)
[ GitHub ]# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1813
def applicable_actions_for(method) case method when :resource SingletonResource.default_actions(api_only?) when :resources Resource.default_actions(api_only?) end end
#apply_action_options(method, options) (private)
[ GitHub ]# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1794
def (method, ) return if .merge (method) end
#apply_common_behavior_for(method, resources, options, &block) (private)
[ GitHub ]# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1760
def apply_common_behavior_for(method, resources, , &block) if resources.length > 1 resources.each { |r| public_send(method, r, , &block) } return true end if [:shallow] .delete(:shallow) shallow do public_send(method, resources.pop, , &block) end return true end if resource_scope? nested { public_send(method, resources.pop, , &block) } return true end .keys.each do |k| ( [:constraints] ||= {})[k] = .delete(k) if [k].is_a?(Regexp) end = .slice!(*RESOURCE_OPTIONS) unless .empty? scope( ) do public_send(method, resources.pop, , &block) end return true end false end
#canonical_action?(action) ⇒ Boolean
(private)
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1872
def canonical_action?(action) resource_method_scope? && CANONICAL_ACTIONS.include?(action.to_s) end
#collection(&block)
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1558
def collection(&block) unless resource_scope? raise ArgumentError, "can't use collection outside resource(s) scope" end with_scope_level(:collection) do path_scope(parent_resource.collection_scope, &block) end end
#decomposed_match(path, controller, options, _path, to, via, formatted, anchor, options_constraints) (private)
[ GitHub ]# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 2022
def decomposed_match(path, controller, , _path, to, via, formatted, anchor, ) if on = .delete(:on) send(on) { decomposed_match(path, controller, , _path, to, via, formatted, anchor, ) } else case @scope.scope_level when :resources nested { decomposed_match(path, controller, , _path, to, via, formatted, anchor, ) } when :resource member { decomposed_match(path, controller, , _path, to, via, formatted, anchor, ) } else add_route(path, controller, , _path, to, via, formatted, anchor, ) end end end
#draw(name)
Loads another routes file with the given name
located inside the config/routes
directory. In that file, you can use the normal routing DSL, but *do not* surround it with a Rails.application.routes.draw
block.
# config/routes.rb
Rails.application.routes.draw do
draw :admin # Loads {config/routes/admin.rb}
draw "third_party/some_gem" # Loads {config/routes/third_party/some_gem.rb}
end
# config/routes/admin.rb
namespace :admin do
resources :accounts
end
# config/routes/third_party/some_gem.rb
mount SomeGem::Engine, at: "/some_gem"
CAUTION: Use this feature with care. Having multiple routes files can negatively impact discoverability and readability. For most applications —even those with a few hundred routes — it’s easier for developers to have a single routes file.
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1667
def draw(name) path = @draw_paths.find do |_path| File.exist? "#{_path}/#{name}.rb" end unless path msg = "Your router tried to #draw the external file #{name}.rb,\n" \ "but the file was not found in:\n\n" msg += @draw_paths.map { |_path| " * #{_path}" }.join("\n") raise ArgumentError, msg end route_path = "#{path}/#{name}.rb" instance_eval(File.read(route_path), route_path.to_s) end
#get_to_from_path(path, to, action) (private)
[ GitHub ]# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 2007
def get_to_from_path(path, to, action) return to if to || action path_without_format = path.sub(/\(\.:format\)$/, "") if using_match_shorthand?(path_without_format) path_without_format.delete_prefix("/").sub(%r{/([^/]*)$}, '#\1').tr("-", "_") else nil end end
#map_match(paths, options) (private)
[ GitHub ]# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1961
def map_match(paths, ) ActionDispatch.deprecator.warn(<<-MSG.squish) if paths.count > 1 Mapping a route with multiple paths is deprecated and will be removed in Rails 8.1. Please use multiple method calls instead. MSG if (on = [:on]) && !VALID_ON_OPTIONS.include?(on) raise ArgumentError, "Unknown scope #{on.inspect} given to :on" end if @scope[:to] [:to] ||= @scope[:to] end if @scope[:controller] && @scope[:action] [:to] ||= "#{@scope[:controller]}##{@scope[:action]}" end controller = .delete(:controller) || @scope[:controller] option_path = .delete :path to = .delete :to via = Mapping.check_via Array( .delete(:via) { @scope[:via] }) formatted = .delete(:format) { @scope[:format] } anchor = .delete(:anchor) { true } = .delete(:constraints) || {} path_types = paths.group_by(&:class) (path_types[String] || []).each do |_path| = .dup if _path && option_path raise ArgumentError, "Ambiguous route definition. Both :path and the route path were specified as strings." end to = get_to_from_path(_path, to, [:action]) decomposed_match(_path, controller, , _path, to, via, formatted, anchor, ) end (path_types[Symbol] || []).each do |action| = .dup decomposed_match(action, controller, , option_path, to, via, formatted, anchor, ) end self end
#match(path, *rest, &block)
Matches a URL pattern to one or more routes. For more information, see [match](Base#match).
match 'path', to: 'controller#action', via: :post
match 'path', 'otherpath', on: :member, via: :get
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1688
def match(path, *rest, &block) if rest.empty? && Hash === path = path path, to = .find { |name, _value| name.is_a?(String) } raise ArgumentError, "Route path not specified" if path.nil? case to when Symbol [:action] = to when String if to.include?("#") [:to] = to else [:controller] = to end else [:to] = to end .delete(path) paths = [path] else = rest.pop || {} paths = [path] + rest end if .key?(:defaults) defaults( .delete(:defaults)) { map_match(paths, , &block) } else map_match(paths, , &block) end end
#match_root_route(options) (private)
[ GitHub ]#member(&block)
To add a member route, add a member block into the resource block:
resources :photos do
member do
get 'preview'
end
end
This will recognize /photos/1/preview
with GET, and route to the preview action of PhotosController
. It will also create the preview_photo_url
and preview_photo_path
helpers.
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1579
def member(&block) unless resource_scope? raise ArgumentError, "can't use member outside resource(s) scope" end with_scope_level(:member) do if shallow? shallow_scope { path_scope(parent_resource.member_scope, &block) } else path_scope(parent_resource.member_scope, &block) end end end
#name_for_action(as, action) (private)
[ GitHub ]# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1912
def name_for_action(as, action) prefix = prefix_name_for_action(as, action) name_prefix = @scope[:as] if parent_resource return nil unless as || action collection_name = parent_resource.collection_name member_name = parent_resource.member_name end action_name = @scope.action_name(name_prefix, prefix, collection_name, member_name) candidate = action_name.select(&:present?).join("_") unless candidate.empty? # If a name was not explicitly given, we check if it is valid and return nil in # case it isn't. Otherwise, we pass the invalid name forward so the underlying # router engine treats it and raises an exception. if as.nil? candidate unless !candidate.match?(/\A[_a-z]/i) || has_named_route?(candidate) else candidate end end end
#namespace(path, options = {})
See Scoping#namespace.
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1626
def namespace(path, = {}) if resource_scope? nested { super } else super end end
#nested(&block)
[ GitHub ]# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1605
def nested(&block) unless resource_scope? raise ArgumentError, "can't use nested outside resource(s) scope" end with_scope_level(:nested) do if shallow? && shallow_nesting_depth >= 1 shallow_scope do path_scope(parent_resource.nested_scope) do scope(, &block) end end else path_scope(parent_resource.nested_scope) do scope(, &block) end end end end
#nested_options (private)
[ GitHub ]# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1849
def = { as: parent_resource.member_name } [:constraints] = { parent_resource.nested_param => param_constraint } if param_constraint? end
#new(&block)
[ GitHub ]# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1595
def new(&block) unless resource_scope? raise ArgumentError, "can't use new outside resource(s) scope" end with_scope_level(:new) do path_scope(parent_resource.new_scope(action_path(:new)), &block) end end
#param_constraint (readonly, private)
[ GitHub ]# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1868
def param_constraint @scope[:constraints][parent_resource.param] end
#parent_resource (private)
[ GitHub ]# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1756
def parent_resource @scope[:scope_level_resource] end
#path_for_action(action, path) (private)
[ GitHub ]# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1886
def path_for_action(action, path) return "#{@scope[:path]}/#{path}" if path if canonical_action?(action) @scope[:path].to_s else "#{@scope[:path]}/#{action_path(action)}" end end
#path_scope(path) (private)
[ GitHub ]# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1954
def path_scope(path) @scope = @scope.new(path: merge_path_scope(@scope[:path], path)) yield ensure @scope = @scope.parent end
#prefix_name_for_action(as, action) (private)
[ GitHub ]# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1900
def prefix_name_for_action(as, action) if as prefix = as elsif !canonical_action?(action) prefix = action end if prefix && prefix != "/" && !prefix.empty? Mapper.normalize_name prefix.to_s.tr("-", "_") end end
#resource(*resources, &block)
Sometimes, you have a resource that clients always look up without referencing an ID. A common example, /profile always shows the profile of the currently logged in user. In this case, you can use a singular resource to map /profile (rather than /profile/:id) to the show action:
resource :profile
This creates six different routes in your application, all mapping to the Profiles
controller (note that the controller is named after the plural):
GET /profile/new
GET /profile
GET /profile/edit
PATCH/PUT /profile
DELETE /profile
POST /profile
If you want instances of a model to work with this resource via record identification (e.g. in form_with
or redirect_to
), you will need to call [resolve](CustomUrls#resolve):
resource :profile
resolve('Profile') { [:profile] }
# Enables this to work with singular routes:
form_with(model: @profile) {}
Options
Takes same options as [resources](#resources)
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1347
def resource(*resources, &block) = resources. .dup if apply_common_behavior_for(:resource, resources, , &block) return self end with_scope_level(:resource) do = :resource, resource_scope(SingletonResource.new(resources.pop, api_only?, @scope[:shallow], )) do yield if block_given? concerns( [:concerns]) if [:concerns] new do get :new end if parent_resource.actions.include?(:new) set_member_mappings_for_resource collection do post :create end if parent_resource.actions.include?(:create) end end self end
#resource_scope(resource, &block) (readonly, private)
[ GitHub ]#resources(*resources, &block)
In Rails, a resourceful route provides a mapping between HTTP verbs and URLs and controller actions. By convention, each action also maps to particular CRUD operations in a database. A single entry in the routing file, such as
resources :photos
creates seven different routes in your application, all mapping to the Photos
controller:
GET /photos
GET /photos/new
POST /photos
GET /photos/:id
GET /photos/:id/edit
PATCH/PUT /photos/:id
DELETE /photos/:id
Resources
can also be nested infinitely by using this block syntax:
resources :photos do
resources :comments
end
This generates the following comments routes:
GET /photos/:photo_id/comments
GET /photos/:photo_id/comments/new
POST /photos/:photo_id/comments
GET /photos/:photo_id/comments/:id
GET /photos/:photo_id/comments/:id/edit
PATCH/PUT /photos/:photo_id/comments/:id
DELETE /photos/:photo_id/comments/:id
Options
Takes same options as [match](Base#match) as well as:
:path_names
: Allows you to change the segment component of the edit
and #new
actions. Actions not specified are not changed.
resources :posts, path_names: { new: "brand_new" }
The above example will now change /posts/new to /posts/brand_new.
:path
: Allows you to change the path prefix for the resource.
resources :posts, path: 'postings'
The resource and all segments will now route to /postings instead of
/posts.
:only
: Only generate routes for the given actions.
resources :cows, only: :show
resources :cows, only: [:show, :index]
:except
: Generate all routes except for the given actions.
resources :cows, except: :show
resources :cows, except: [:show, :index]
:shallow
: Generates shallow routes for nested resource(s). When placed on a parent
resource, generates shallow routes for all nested resources.
resources :posts, shallow: true do
resources :comments
end
Is the same as:
resources :posts do
resources :comments, except: [:show, :edit, :update, :destroy]
end
resources :comments, only: [:show, :edit, :update, :destroy]
This allows URLs for resources that otherwise would be deeply nested such
as a comment on a blog post like {/posts/a-long-permalink/comments/1234}
to be shortened to just {/comments/1234}.
Set `shallow: false` on a child resource to ignore a parent's shallow
parameter.
:shallow_path
: Prefixes nested shallow routes with the specified path.
scope shallow_path: "sekret" do
resources :posts do
resources :comments, shallow: true
end
end
The {comments} resource here will have the following routes generated for
it:
post_comments GET /posts/:post_id/comments(.:format)
post_comments POST /posts/:post_id/comments(.:format)
new_post_comment GET /posts/:post_id/comments/new(.:format)
edit_comment GET /sekret/comments/:id/edit(.:format)
comment GET /sekret/comments/:id(.:format)
comment PATCH/PUT /sekret/comments/:id(.:format)
comment DELETE /sekret/comments/:id(.:format)
:shallow_prefix
: Prefixes nested shallow route names with specified prefix.
scope shallow_prefix: "sekret" do
resources :posts do
resources :comments, shallow: true
end
end
The {comments} resource here will have the following routes generated for
it:
post_comments GET /posts/:post_id/comments(.:format)
post_comments POST /posts/:post_id/comments(.:format)
new_post_comment GET /posts/:post_id/comments/new(.:format)
edit_sekret_comment GET /comments/:id/edit(.:format)
sekret_comment GET /comments/:id(.:format)
sekret_comment PATCH/PUT /comments/:id(.:format)
sekret_comment DELETE /comments/:id(.:format)
:format
: Allows you to specify the default value for optional format
segment or
disable it by {false}.
:param
: Allows you to override the default param name of :id
in the URL.
Examples
# routes call {Admin::PostsController}
resources :posts, module: "admin"
# resource actions are at /admin/posts.
resources :posts, path: "admin/posts"
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1517
def resources(*resources, &block) = resources. .dup if apply_common_behavior_for(:resources, resources, , &block) return self end with_scope_level(:resources) do = :resources, resource_scope(Resource.new(resources.pop, api_only?, @scope[:shallow], )) do yield if block_given? concerns( [:concerns]) if [:concerns] collection do get :index if parent_resource.actions.include?(:index) post :create if parent_resource.actions.include?(:create) end new do get :new end if parent_resource.actions.include?(:new) set_member_mappings_for_resource end end self end
#resources_path_names(options)
[ GitHub ]# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1314
def resources_path_names( ) @scope[:path_names].merge!( ) end
#root(path, options = {})
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.
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1735
def root(path, = {}) if path.is_a?(String) [:to] = path elsif path.is_a?(Hash) && .empty? = path else raise ArgumentError, "must be called with a path and/or options" end if @scope.resources? with_scope_level(:root) do path_scope(parent_resource.path) do match_root_route( ) end end else match_root_route( ) end end
#scope_action_options(method) (private)
[ GitHub ]# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1803
def (method) return {} unless @scope[: ] actions = applicable_actions_for(method) @scope[: ].dup.tap do || ( [:only] = Array( [:only]) & actions) if [:only] ( [:except] = Array( [:except]) & actions) if [:except] end end
#set_member_mappings_for_resource (private)
[ GitHub ]# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1938
def set_member_mappings_for_resource # :doc: member do get :edit if parent_resource.actions.include?(:edit) get :show if parent_resource.actions.include?(:show) if parent_resource.actions.include?(:update) patch :update put :update end delete :destroy if parent_resource.actions.include?(:destroy) end end
#shallow_nesting_depth (private)
[ GitHub ]# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1858
def shallow_nesting_depth @scope.find_all { |node| node.frame[:scope_level_resource] }.count { |node| node.frame[:scope_level_resource].shallow? } end
#shallow_scope (private)
[ GitHub ]# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1876
def shallow_scope scope = { as: @scope[:shallow_prefix], path: @scope[:shallow_path] } @scope = @scope.new scope yield ensure @scope = @scope.parent end
#using_match_shorthand?(path) ⇒ Boolean
(private)
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 2018
def using_match_shorthand?(path) %r{^/?[-\w]/[-\w/]$}.match?(path) end
#with_scope_level(kind) (private)
[ GitHub ]# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1834
def with_scope_level(kind) # :doc: @scope = @scope.new_level(kind) yield ensure @scope = @scope.parent end