# frozen_string_literal: true
require "active_support/core_ext/hash/slice"
require "active_support/core_ext/enumerable"
require "active_support/core_ext/array/extract_options"
require "active_support/core_ext/regexp"
require "action_dispatch/routing/redirection"
require "action_dispatch/routing/endpoint"
module ActionDispatch
module Routing
class Mapper
URL_OPTIONS = [:protocol, :subdomain, :domain, :host, :port]
class Constraints < Routing::Endpoint #:nodoc:
attr_reader :app, :constraints
SERVE = ->(app, req) { app.serve req }
CALL = ->(app, req) { app.call req.env }
def initialize(app, constraints, strategy)
# Unwrap Constraints objects. I don't actually think it's possible
# to pass a Constraints object to this constructor, but there were
# multiple places that kept testing children of this object. I
# *think* they were just being defensive, but I have no idea.
if app.is_a?(self.class)
constraints += app.constraints
app = app.app
end
@strategy = strategy
@app, @constraints, = app, constraints
end
def dispatcher?; @strategy == SERVE; end
def matches?(req)
@constraints.all? do |constraint|
(constraint.respond_to?(:matches?) && constraint.matches?(req)) ||
(constraint.respond_to?(:call) && constraint.call(*constraint_args(constraint, req)))
end
end
def serve(req)
return [ 404, { "X-Cascade" => "pass" }, [] ] unless matches?(req)
@strategy.call @app, req
end
private
def constraint_args(constraint, request)
arity = if constraint.respond_to?(:arity)
constraint.arity
else
constraint.method(:call).arity
end
if arity < 1
[]
elsif arity == 1
[request]
else
[request.path_parameters, request]
end
end
end
class Mapping #:nodoc:
ANCHOR_CHARACTERS_REGEX = %r{\A(\\A|\^)|(\\Z|\\z|\$)\Z}
OPTIONAL_FORMAT_REGEX = %r{(?:\(\.:format\)+|\.:format|/)\Z}
attr_reader :requirements, :defaults
attr_reader :to, :default_controller, :default_action
attr_reader :required_defaults, :ast
def self.build(scope, set, ast, controller, default_action, to, via, formatted, options_constraints, anchor, options)
options = scope[:options].merge(options) if scope[:options]
defaults = (scope[:defaults] || {}).dup
scope_constraints = scope[:constraints] || {}
new set, ast, defaults, controller, default_action, scope[:module], to, formatted, scope_constraints, scope[:blocks] || [], via, options_constraints, anchor, options
end
def self.check_via(via)
if via.empty?
msg = "You should not use the `match` method in your router without specifying an HTTP method.\n" \
"If you want to expose your action to both GET and POST, add `via: [:get, :post]` option.\n" \
"If you want to expose your action to GET, use `get` in the router:\n" \
" Instead of: match \"controller#action\"\n" \
" Do: get \"controller#action\""
raise ArgumentError, msg
end
via
end
def self.normalize_path(path, format)
path = Mapper.normalize_path(path)
if format == true
"#{path}.:format"
elsif optional_format?(path, format)
"#{path}(.:format)"
else
path
end
end
def self.optional_format?(path, format)
format != false && path !~ OPTIONAL_FORMAT_REGEX
end
def initialize(set, ast, defaults, controller, default_action, modyoule, to, formatted, scope_constraints, blocks, via, options_constraints, anchor, options)
@defaults = defaults
@set = set
@to = to
@default_controller = controller
@default_action = default_action
@ast = ast
@anchor = anchor
@via = via
@internal = options.delete(:internal)
path_params = ast.find_all(&:symbol?).map(&:to_sym)
options = add_wildcard_options(options, formatted, ast)
options = normalize_options!(options, path_params, modyoule)
split_options = constraints(options, path_params)
constraints = scope_constraints.merge Hash[split_options[:constraints] || []]
if options_constraints.is_a?(Hash)
@defaults = Hash[options_constraints.find_all { |key, default|
URL_OPTIONS.include?(key) && (String === default || Integer === default)
}].merge @defaults
@blocks = blocks
constraints.merge! options_constraints
else
@blocks = blocks(options_constraints)
end
requirements, conditions = split_constraints path_params, constraints
verify_regexp_requirements requirements.map(&:last).grep(Regexp)
formats = normalize_format(formatted)
@requirements = formats[:requirements].merge Hash[requirements]
@conditions = Hash[conditions]
@defaults = formats[:defaults].merge(@defaults).merge(normalize_defaults(options))
if path_params.include?(:action) && !@requirements.key?(:action)
@defaults[:action] ||= "index"
end
@required_defaults = (split_options[:required_defaults] || []).map(&:first)
end
def make_route(name, precedence)
Journey::Route.new(name, application, path, conditions, required_defaults,
defaults, request_method, precedence, @internal)
end
def application
app(@blocks)
end
def path
build_path @ast, requirements, @anchor
end
def conditions
build_conditions @conditions, @set.request_class
end
def build_conditions(current_conditions, request_class)
conditions = current_conditions.dup
conditions.keep_if do |k, _|
request_class.public_method_defined?(k)
end
end
private :build_conditions
def request_method
@via.map { |x| Journey::Route.verb_matcher(x) }
end
private :request_method
JOINED_SEPARATORS = SEPARATORS.join # :nodoc:
def build_path(ast, requirements, anchor)
pattern = Journey::Path::Pattern.new(ast, requirements, JOINED_SEPARATORS, anchor)
# Find all the symbol nodes that are adjacent to literal nodes and alter
# the regexp so that Journey will partition them into custom routes.
ast.find_all { |node|
next unless node.cat?
if node.left.literal? && node.right.symbol?
symbol = node.right
elsif node.left.literal? && node.right.cat? && node.right.left.symbol?
symbol = node.right.left
elsif node.left.symbol? && node.right.literal?
symbol = node.left
elsif node.left.symbol? && node.right.cat? && node.right.left.literal?
symbol = node.left
else
next
end
if symbol
symbol.regexp = /(?:#{Regexp.union(symbol.regexp, '-')})+/
end
}
pattern
end
private :build_path
private
def add_wildcard_options(options, formatted, path_ast)
# Add a constraint for wildcard route to make it non-greedy and match the
# optional format part of the route by default.
if formatted != false
path_ast.grep(Journey::Nodes::Star).each_with_object({}) { |node, hash|
hash[node.name.to_sym] ||= /.+?/
}.merge options
else
options
end
end
def normalize_options!(options, path_params, modyoule)
if path_params.include?(:controller)
raise ArgumentError, ":controller segment is not allowed within a namespace block" if modyoule
# Add a default constraint for :controller path segments that matches namespaced
# controllers with default routes like :controller/:action/:id(.:format), e.g:
# GET /admin/products/show/1
# => { controller: 'admin/products', action: 'show', id: '1' }
options[:controller] ||= /.+?/
end
if to.respond_to?(:action) || to.respond_to?(:call)
options
else
to_endpoint = split_to to
controller = to_endpoint[0] || default_controller
action = to_endpoint[1] || default_action
controller = add_controller_module(controller, modyoule)
options.merge! check_controller_and_action(path_params, controller, action)
end
end
def split_constraints(path_params, constraints)
constraints.partition do |key, requirement|
path_params.include?(key) || key == :controller
end
end
def normalize_format(formatted)
case formatted
when true
{ requirements: { format: /.+/ },
defaults: {} }
when Regexp
{ requirements: { format: formatted },
defaults: { format: nil } }
when String
{ requirements: { format: Regexp.compile(formatted) },
defaults: { format: formatted } }
else
{ requirements: {}, defaults: {} }
end
end
def verify_regexp_requirements(requirements)
requirements.each do |requirement|
if ANCHOR_CHARACTERS_REGEX.match?(requirement.source)
raise ArgumentError, "Regexp anchor characters are not allowed in routing requirements: #{requirement.inspect}"
end
if requirement.multiline?
raise ArgumentError, "Regexp multiline option is not allowed in routing requirements: #{requirement.inspect}"
end
end
end
def normalize_defaults(options)
Hash[options.reject { |_, default| Regexp === default }]
end
def app(blocks)
if to.respond_to?(:action)
Routing::RouteSet::StaticDispatcher.new to
elsif to.respond_to?(:call)
Constraints.new(to, blocks, Constraints::CALL)
elsif blocks.any?
Constraints.new(dispatcher(defaults.key?(:controller)), blocks, Constraints::SERVE)
else
dispatcher(defaults.key?(:controller))
end
end
def check_controller_and_action(path_params, controller, action)
hash = check_part(:controller, controller, path_params, {}) do |part|
translate_controller(part) {
message = +"'#{part}' is not a supported controller name. This can lead to potential routing problems."
message << " See https://guides.rubyonrails.org/routing.html#specifying-a-controller-to-use"
raise ArgumentError, message
}
end
check_part(:action, action, path_params, hash) { |part|
part.is_a?(Regexp) ? part : part.to_s
}
end
def check_part(name, part, path_params, hash)
if part
hash[name] = yield(part)
else
unless path_params.include?(name)
message = "Missing :#{name} key on routes definition, please check your routes."
raise ArgumentError, message
end
end
hash
end
def split_to(to)
if /#/.match?(to)
to.split("#")
else
[]
end
end
def add_controller_module(controller, modyoule)
if modyoule && !controller.is_a?(Regexp)
if %r{\A/}.match?(controller)
controller[1..-1]
else
[modyoule, controller].compact.join("/")
end
else
controller
end
end
def translate_controller(controller)
return controller if Regexp === controller
return controller.to_s if controller =~ /\A[a-z_0-9][a-z_0-9\/]*\z/
yield
end
def blocks(callable_constraint)
unless callable_constraint.respond_to?(:call) || callable_constraint.respond_to?(:matches?)
raise ArgumentError, "Invalid constraint: #{callable_constraint.inspect} must respond to :call or :matches?"
end
[callable_constraint]
end
def constraints(options, path_params)
options.group_by do |key, option|
if Regexp === option
:constraints
else
if path_params.include?(key)
:path_params
else
:required_defaults
end
end
end
end
def dispatcher(raise_on_name_error)
Routing::RouteSet::Dispatcher.new raise_on_name_error
end
end
# Invokes Journey::Router::Utils.normalize_path and ensure that
# (:locale) becomes (/:locale) instead of /(:locale). Except
# for root cases, where the latter is the correct one.
def self.normalize_path(path)
path = Journey::Router::Utils.normalize_path(path)
path.gsub!(%r{/(\(+)/?}, '\1/') unless path =~ %r{^/(\(+[^)]+\)){1,}$}
path
end
def self.normalize_name(name)
normalize_path(name)[1..-1].tr("/", "_")
end
module Base
# 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[rdoc-ref: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>].
# 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 to
# +call+ 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 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 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 supplying +false+.
def match(path, options = nil)
end
# 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.
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, options.merge(to: app, anchor: false, format: false))
define_generate_prefix(app, target_as) if rails_app
self
end
def default_url_options=(options)
@set.default_url_options = options
end
alias_method :default_url_options, :default_url_options=
def with_default_scope(scope, &block)
scope(scope) do
instance_exec(&block)
end
end
# Query if the following named route was already defined.
def has_named_route?(name)
@set.named_routes.key?(name)
end
private
def rails_app?(app)
app.is_a?(Class) && app < Rails::Railtie
end
def app_name(app, rails_app)
if rails_app
app.railtie_name
elsif app.is_a?(Class)
class_name = app.name
ActiveSupport::Inflector.underscore(class_name).tr("/", "_")
end
end
def define_generate_prefix(app, name)
_route = @set.named_routes.get name
_routes = @set
_url_helpers = @set.url_helpers
script_namer = ->(options) do
prefix_options = options.slice(*_route.segment_keys)
prefix_options[:relative_url_root] = ""
if options[:_recall]
prefix_options.reverse_merge!(options[:_recall].slice(*_route.segment_keys))
end
# We must actually delete prefix segment keys to avoid passing them to next url_for.
_route.segment_keys.each { |k| options.delete(k) }
_url_helpers.send("#{name}_path", prefix_options)
end
app.routes.define_mounted_helper(name, script_namer)
app.routes.extend Module.new {
def optimize_routes_generation?; false; end
define_method :find_script_name do |options|
if options.key? :script_name
super(options)
else
script_namer.call(options)
end
end
}
end
end
module HttpHelpers
# Define a route that only recognizes HTTP GET.
# For supported arguments, see match[rdoc-ref:Base#match]
#
# get 'bacon', to: 'food#bacon'
def get(*args, &block)
map_method(:get, args, &block)
end
# Define a route that only recognizes HTTP POST.
# For supported arguments, see match[rdoc-ref:Base#match]
#
# post 'bacon', to: 'food#bacon'
def post(*args, &block)
map_method(:post, args, &block)
end
# Define a route that only recognizes HTTP PATCH.
# For supported arguments, see match[rdoc-ref:Base#match]
#
# patch 'bacon', to: 'food#bacon'
def patch(*args, &block)
map_method(:patch, args, &block)
end
# Define a route that only recognizes HTTP PUT.
# For supported arguments, see match[rdoc-ref:Base#match]
#
# put 'bacon', to: 'food#bacon'
def put(*args, &block)
map_method(:put, args, &block)
end
# Define a route that only recognizes HTTP DELETE.
# For supported arguments, see match[rdoc-ref:Base#match]
#
# delete 'broccoli', to: 'food#broccoli'
def delete(*args, &block)
map_method(:delete, args, &block)
end
private
def map_method(method, args, &block)
options = args.extract_options!
options[:via] = method
match(*args, options, &block)
self
end
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
#
# This will create a number of routes for each of the posts and comments
# controller. For Admin::PostsController, Rails will create:
#
# GET /admin/posts
# GET /admin/posts/new
# POST /admin/posts
# GET /admin/posts/1
# GET /admin/posts/1/edit
# PATCH/PUT /admin/posts/1
# DELETE /admin/posts/1
#
# If you want to route /posts (without the prefix /admin) to
# Admin::PostsController, you could use
#
# scope module: "admin" do
# resources :posts
# end
#
# or, for a single case
#
# resources :posts, module: "admin"
#
# If you want to route /admin/posts to +PostsController+
# (without the Admin:: module prefix), you could use
#
# scope "/admin" do
# resources :posts
# end
#
# or, for a single case
#
# resources :posts, path: "/admin/posts"
#
# In each of these cases, the named routes remain the same as if you did
# not use scope. In the last case, the following paths map to
# +PostsController+:
#
# GET /admin/posts
# GET /admin/posts/new
# POST /admin/posts
# GET /admin/posts/1
# GET /admin/posts/1/edit
# PATCH/PUT /admin/posts/1
# DELETE /admin/posts/1
module Scoping
# Scopes a set of routes to the given default options.
#
# Take the following route definition as an example:
#
# scope path: ":account_id", as: "account" do
# resources :projects
# end
#
# This generates helpers such as +account_projects_path+, just like +resources+ does.
# The difference here being that the routes generated are like /:account_id/projects,
# rather than /accounts/:account_id/projects.
#
# === Options
#
# Takes same options as Base#match and Resources#resources.
#
# # route /posts (without the prefix /admin) to Admin::PostsController
# scope module: "admin" do
# resources :posts
# end
#
# # prefix the posts resource's requests with '/admin'
# scope path: "/admin" do
# resources :posts
# end
#
# # prefix the routing helper name: +sekret_posts_path+ instead of +posts_path+
# scope as: "sekret" do
# resources :posts
# end
def scope(*args)
options = args.extract_options!.dup
scope = {}
options[:path] = args.flatten.join("/") if args.any?
options[:constraints] ||= {}
unless nested_scope?
options[:shallow_path] ||= options[:path] if options.key?(:path)
options[:shallow_prefix] ||= options[:as] if options.key?(:as)
end
if options[:constraints].is_a?(Hash)
defaults = options[:constraints].select do |k, v|
URL_OPTIONS.include?(k) && (v.is_a?(String) || v.is_a?(Integer))
end
options[:defaults] = defaults.merge(options[:defaults] || {})
else
block, options[:constraints] = options[:constraints], {}
end
if options.key?(:only) || options.key?(:except)
scope[:action_options] = { only: options.delete(:only),
except: options.delete(:except) }
end
if options.key? :anchor
raise ArgumentError, "anchor is ignored unless passed to `match`"
end
@scope.options.each do |option|
if option == :blocks
value = block
elsif option == :options
value = options
else
value = options.delete(option) { POISON }
end
unless POISON == value
scope[option] = send("merge_#{option}_scope", @scope[option], value)
end
end
@scope = @scope.new scope
yield
self
ensure
@scope = @scope.parent
end
POISON = Object.new # :nodoc:
# Scopes routes to a specific controller
#
# controller "food" do
# match "bacon", action: :bacon, via: :get
# end
def controller(controller)
@scope = @scope.new(controller: controller)
yield
ensure
@scope = @scope.parent
end
# Scopes routes to a specific namespace. For example:
#
# namespace :admin do
# resources :posts
# end
#
# This generates the following routes:
#
# admin_posts GET /admin/posts(.:format) admin/posts#index
# admin_posts POST /admin/posts(.:format) admin/posts#create
# new_admin_post GET /admin/posts/new(.:format) admin/posts#new
# edit_admin_post GET /admin/posts/:id/edit(.:format) admin/posts#edit
# admin_post GET /admin/posts/:id(.:format) admin/posts#show
# admin_post PATCH/PUT /admin/posts/:id(.:format) admin/posts#update
# admin_post DELETE /admin/posts/:id(.:format) admin/posts#destroy
#
# === Options
#
# The +:path+, +:as+, +:module+, +:shallow_path+ and +:shallow_prefix+
# options all default to the name of the namespace.
#
# For options, see Base#match. For +:shallow_path+ option, see
# Resources#resources.
#
# # accessible through /sekret/posts rather than /admin/posts
# namespace :admin, path: "sekret" do
# resources :posts
# end
#
# # maps to Sekret::PostsController rather than Admin::PostsController
# namespace :admin, module: "sekret" do
# resources :posts
# end
#
# # generates +sekret_posts_path+ rather than +admin_posts_path+
# namespace :admin, as: "sekret" do
# resources :posts
# end
def namespace(path, options = {})
path = path.to_s
defaults = {
module: path,
as: options.fetch(:as, path),
shallow_path: options.fetch(:path, path),
shallow_prefix: options.fetch(:as, path)
}
path_scope(options.delete(:path) { path }) do
scope(defaults.merge!(options)) { yield }
end
end
# === Parameter Restriction
# Allows you to constrain the nested routes based on a set of rules.
# For instance, in order to change the routes to allow for a dot character in the +id+ parameter:
#
# constraints(id: /\d+\.\d+/) do
# resources :posts
# end
#
# Now routes such as +/posts/1+ will no longer be valid, but +/posts/1.1+ will be.
# The +id+ parameter must match the constraint passed in for this example.
#
# You may use this to also restrict other parameters:
#
# resources :posts do
# constraints(post_id: /\d+\.\d+/) do
# resources :comments
# end
# end
#
# === Restricting based on IP
#
# Routes can also be constrained to an IP or a certain range of IP addresses:
#
# constraints(ip: /192\.168\.\d+\.\d+/) do
# resources :posts
# end
#
# Any user connecting from the 192.168.* range will be able to see this resource,
# where as any user connecting outside of this range will be told there is no such route.
#
# === Dynamic request matching
#
# Requests to routes can be constrained based on specific criteria:
#
# constraints(-> (req) { req.env["HTTP_USER_AGENT"] =~ /iPhone/ }) do
# resources :iphones
# end
#
# You are able to move this logic out into a class if it is too complex for routes.
# This class must have a +matches?+ method defined on it which either returns +true+
# if the user should be given access to that route, or +false+ if the user should not.
#
# class Iphone
# def self.matches?(request)
# request.env["HTTP_USER_AGENT"] =~ /iPhone/
# end
# end
#
# An expected place for this code would be +lib/constraints+.
#
# This class is then used like this:
#
# constraints(Iphone) do
# resources :iphones
# end
def constraints(constraints = {})
scope(constraints: constraints) { yield }
end
# Allows you to set default parameters for a route, such as this:
# defaults id: 'home' do
# match 'scoped_pages/(:id)', to: 'pages#show'
# end
# Using this, the +:id+ parameter here will default to 'home'.
def defaults(defaults = {})
@scope = @scope.new(defaults: merge_defaults_scope(@scope[:defaults], defaults))
yield
ensure
@scope = @scope.parent
end
private
def merge_path_scope(parent, child)
Mapper.normalize_path("#{parent}/#{child}")
end
def merge_shallow_path_scope(parent, child)
Mapper.normalize_path("#{parent}/#{child}")
end
def merge_as_scope(parent, child)
parent ? "#{parent}_#{child}" : child
end
def merge_shallow_prefix_scope(parent, child)
parent ? "#{parent}_#{child}" : child
end
def merge_module_scope(parent, child)
parent ? "#{parent}/#{child}" : child
end
def merge_controller_scope(parent, child)
child
end
def merge_action_scope(parent, child)
child
end
def merge_via_scope(parent, child)
child
end
def merge_format_scope(parent, child)
child
end
def merge_path_names_scope(parent, child)
merge_options_scope(parent, child)
end
def merge_constraints_scope(parent, child)
merge_options_scope(parent, child)
end
def merge_defaults_scope(parent, child)
merge_options_scope(parent, child)
end
def merge_blocks_scope(parent, child)
merged = parent ? parent.dup : []
merged << child if child
merged
end
def merge_options_scope(parent, child)
(parent || {}).merge(child)
end
def merge_shallow_scope(parent, child)
child ? true : false
end
def merge_to_scope(parent, child)
child
end
end
# 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+.
#
module Resources
# CANONICAL_ACTIONS holds all actions that does not need a prefix or
# a path appended since they fit properly in their scope level.
VALID_ON_OPTIONS = [:new, :collection, :member]
RESOURCE_OPTIONS = [:as, :controller, :path, :only, :except, :param, :concerns]
CANONICAL_ACTIONS = %w(index create new show update destroy)
class Resource #:nodoc:
attr_reader :controller, :path, :param
def initialize(entities, api_only, shallow, options = {})
@name = entities.to_s
@path = (options[:path] || @name).to_s
@controller = (options[:controller] || @name).to_s
@as = options[:as]
@param = (options[:param] || :id).to_sym
@options = options
@shallow = shallow
@api_only = api_only
@only = options.delete :only
@except = options.delete :except
end
def default_actions
if @api_only
[:index, :create, :show, :update, :destroy]
else
[:index, :create, :new, :show, :update, :destroy, :edit]
end
end
def actions
if @except
available_actions - Array(@except).map(&:to_sym)
else
available_actions
end
end
def available_actions
if @only
Array(@only).map(&:to_sym)
else
default_actions
end
end
def name
@as || @name
end
def plural
@plural ||= name.to_s
end
def singular
@singular ||= name.to_s.singularize
end
alias :member_name :singular
# Checks for uncountable plurals, and appends "_index" if the plural
# and singular form are the same.
def collection_name
singular == plural ? "#{plural}_index" : plural
end
def resource_scope
controller
end
alias :collection_scope :path
def member_scope
"#{path}/:#{param}"
end
alias :shallow_scope :member_scope
def new_scope(new_path)
"#{path}/#{new_path}"
end
def nested_param
:"#{singular}_#{param}"
end
def nested_scope
"#{path}/:#{nested_param}"
end
def shallow?
@shallow
end
def singleton?; false; end
end
class SingletonResource < Resource #:nodoc:
def initialize(entities, api_only, shallow, options)
super
@as = nil
@controller = (options[:controller] || plural).to_s
@as = options[:as]
end
def default_actions
if @api_only
[:show, :create, :update, :destroy]
else
[:show, :create, :update, :destroy, :new, :edit]
end
end
def plural
@plural ||= name.to_s.pluralize
end
def singular
@singular ||= name.to_s
end
alias :member_name :singular
alias :collection_name :singular
alias :member_scope :path
alias :nested_scope :path
def singleton?; true; end
end
def resources_path_names(options)
@scope[:path_names].merge!(options)
end
# 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
#
# === Options
# Takes same options as resources[rdoc-ref:#resources]
def resource(*resources, &block)
options = resources.extract_options!.dup
if apply_common_behavior_for(:resource, resources, options, &block)
return self
end
with_scope_level(:resource) do
options = apply_action_options options
resource_scope(SingletonResource.new(resources.pop, api_only?, @scope[:shallow], options)) do
yield if block_given?
concerns(options[:concerns]) if options[: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
# 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[rdoc-ref: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.
#
# [: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 supplying +false+.
#
# === Examples
#
# # routes call Admin::PostsController
# resources :posts, module: "admin"
#
# # resource actions are at /admin/posts.
# resources :posts, path: "admin/posts"
def resources(*resources, &block)
options = resources.extract_options!.dup
if apply_common_behavior_for(:resources, resources, options, &block)
return self
end
with_scope_level(:resources) do
options = apply_action_options options
resource_scope(Resource.new(resources.pop, api_only?, @scope[:shallow], options)) do
yield if block_given?
concerns(options[:concerns]) if options[: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
# To add a route to the collection:
#
# resources :photos do
# collection do
# get 'search'
# end
# end
#
# This will enable Rails to recognize paths such as /photos/search
# with GET, and route to the search action of +PhotosController+. It will also
# create the search_photos_url and search_photos_path
# route helpers.
def collection
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) do
yield
end
end
end
# 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.
def member
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) { yield }
}
else
path_scope(parent_resource.member_scope) { yield }
end
end
end
def new
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))) do
yield
end
end
end
def nested
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(nested_options) { yield }
end
end
else
path_scope(parent_resource.nested_scope) do
scope(nested_options) { yield }
end
end
end
end
# See ActionDispatch::Routing::Mapper::Scoping#namespace.
def namespace(path, options = {})
if resource_scope?
nested { super }
else
super
end
end
def shallow
@scope = @scope.new(shallow: true)
yield
ensure
@scope = @scope.parent
end
def shallow?
!parent_resource.singleton? && @scope[:shallow]
end
# Matches a URL pattern to one or more routes.
# For more information, see match[rdoc-ref:Base#match].
#
# match 'path' => 'controller#action', via: :patch
# match 'path', to: 'controller#action', via: :post
# match 'path', 'otherpath', on: :member, via: :get
def match(path, *rest, &block)
if rest.empty? && Hash === path
options = path
path, to = options.find { |name, _value| name.is_a?(String) }
raise ArgumentError, "Route path not specified" if path.nil?
case to
when Symbol
options[:action] = to
when String
if /#/.match?(to)
options[:to] = to
else
options[:controller] = to
end
else
options[:to] = to
end
options.delete(path)
paths = [path]
else
options = rest.pop || {}
paths = [path] + rest
end
if options.key?(:defaults)
defaults(options.delete(:defaults)) { map_match(paths, options, &block) }
else
map_match(paths, options, &block)
end
end
# 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.
def root(path, options = {})
if path.is_a?(String)
options[:to] = path
elsif path.is_a?(Hash) && options.empty?
options = 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(options)
end
end
else
match_root_route(options)
end
end
private
def parent_resource
@scope[:scope_level_resource]
end
def apply_common_behavior_for(method, resources, options, &block)
if resources.length > 1
resources.each { |r| send(method, r, options, &block) }
return true
end
if options.delete(:shallow)
shallow do
send(method, resources.pop, options, &block)
end
return true
end
if resource_scope?
nested { send(method, resources.pop, options, &block) }
return true
end
options.keys.each do |k|
(options[:constraints] ||= {})[k] = options.delete(k) if options[k].is_a?(Regexp)
end
scope_options = options.slice!(*RESOURCE_OPTIONS)
unless scope_options.empty?
scope(scope_options) do
send(method, resources.pop, options, &block)
end
return true
end
false
end
def apply_action_options(options)
return options if action_options? options
options.merge scope_action_options
end
def action_options?(options)
options[:only] || options[:except]
end
def scope_action_options
@scope[:action_options] || {}
end
def resource_scope?
@scope.resource_scope?
end
def resource_method_scope?
@scope.resource_method_scope?
end
def nested_scope?
@scope.nested?
end
def with_scope_level(kind) # :doc:
@scope = @scope.new_level(kind)
yield
ensure
@scope = @scope.parent
end
def resource_scope(resource)
@scope = @scope.new(scope_level_resource: resource)
controller(resource.resource_scope) { yield }
ensure
@scope = @scope.parent
end
def nested_options
options = { as: parent_resource.member_name }
options[:constraints] = {
parent_resource.nested_param => param_constraint
} if param_constraint?
options
end
def shallow_nesting_depth
@scope.find_all { |node|
node.frame[:scope_level_resource]
}.count { |node| node.frame[:scope_level_resource].shallow? }
end
def param_constraint?
@scope[:constraints] && @scope[:constraints][parent_resource.param].is_a?(Regexp)
end
def param_constraint
@scope[:constraints][parent_resource.param]
end
def canonical_action?(action)
resource_method_scope? && CANONICAL_ACTIONS.include?(action.to_s)
end
def shallow_scope
scope = { as: @scope[:shallow_prefix],
path: @scope[:shallow_path] }
@scope = @scope.new scope
yield
ensure
@scope = @scope.parent
end
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
def action_path(name)
@scope[:path_names][name.to_sym] || name
end
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
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 !~ /\A[_a-z]/i || has_named_route?(candidate)
else
candidate
end
end
end
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
def api_only? # :doc:
@set.api_only?
end
def path_scope(path)
@scope = @scope.new(path: merge_path_scope(@scope[:path], path))
yield
ensure
@scope = @scope.parent
end
def map_match(paths, options)
if options[:on] && !VALID_ON_OPTIONS.include?(options[:on])
raise ArgumentError, "Unknown scope #{on.inspect} given to :on"
end
if @scope[:to]
options[:to] ||= @scope[:to]
end
if @scope[:controller] && @scope[:action]
options[:to] ||= "#{@scope[:controller]}##{@scope[:action]}"
end
controller = options.delete(:controller) || @scope[:controller]
option_path = options.delete :path
to = options.delete :to
via = Mapping.check_via Array(options.delete(:via) {
@scope[:via]
})
formatted = options.delete(:format) { @scope[:format] }
anchor = options.delete(:anchor) { true }
options_constraints = options.delete(:constraints) || {}
path_types = paths.group_by(&:class)
path_types.fetch(String, []).each do |_path|
route_options = options.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, route_options[:action])
decomposed_match(_path, controller, route_options, _path, to, via, formatted, anchor, options_constraints)
end
path_types.fetch(Symbol, []).each do |action|
route_options = options.dup
decomposed_match(action, controller, route_options, option_path, to, via, formatted, anchor, options_constraints)
end
self
end
def get_to_from_path(path, to, action)
return to if to || action
path_without_format = path.sub(/\(\.:format\)$/, "")
if using_match_shorthand?(path_without_format)
path_without_format.gsub(%r{^/}, "").sub(%r{/([^/]*)$}, '#\1').tr("-", "_")
else
nil
end
end
def using_match_shorthand?(path)
path =~ %r{^/?[-\w]+/[-\w/]+$}
end
def decomposed_match(path, controller, options, _path, to, via, formatted, anchor, options_constraints)
if on = options.delete(:on)
send(on) { decomposed_match(path, controller, options, _path, to, via, formatted, anchor, options_constraints) }
else
case @scope.scope_level
when :resources
nested { decomposed_match(path, controller, options, _path, to, via, formatted, anchor, options_constraints) }
when :resource
member { decomposed_match(path, controller, options, _path, to, via, formatted, anchor, options_constraints) }
else
add_route(path, controller, options, _path, to, via, formatted, anchor, options_constraints)
end
end
end
def add_route(action, controller, options, _path, to, via, formatted, anchor, options_constraints)
path = path_for_action(action, _path)
raise ArgumentError, "path is required" if path.blank?
action = action.to_s
default_action = options.delete(:action) || @scope[:action]
if /^[\w\-\/]+$/.match?(action)
default_action ||= action.tr("-", "_") unless action.include?("/")
else
action = nil
end
as = if !options.fetch(:as, true) # if it's set to nil or false
options.delete(:as)
else
name_for_action(options.delete(:as), action)
end
path = Mapping.normalize_path URI.parser.escape(path), formatted
ast = Journey::Parser.parse path
mapping = Mapping.build(@scope, @set, ast, controller, default_action, to, via, formatted, options_constraints, anchor, options)
@set.add_route(mapping, as)
end
def match_root_route(options)
args = ["/", { as: :root, via: :get }.merge(options)]
match(*args)
end
end
# Routing Concerns allow you to declare common routes that can be reused
# inside others resources and routes.
#
# concern :commentable do
# resources :comments
# end
#
# concern :image_attachable do
# resources :images, only: :index
# end
#
# These concerns are used in Resources routing:
#
# resources :messages, concerns: [:commentable, :image_attachable]
#
# or in a scope or namespace:
#
# namespace :posts do
# concerns :commentable
# end
module Concerns
# Define a routing concern using a name.
#
# Concerns may be defined inline, using a block, or handled by
# another object, by passing that object as the second parameter.
#
# The concern object, if supplied, should respond to call,
# which will receive two parameters:
#
# * The current mapper
# * A hash of options which the concern object may use
#
# Options may also be used by concerns defined in a block by accepting
# a block parameter. So, using a block, you might do something as
# simple as limit the actions available on certain resources, passing
# standard resource options through the concern:
#
# concern :commentable do |options|
# resources :comments, options
# end
#
# resources :posts, concerns: :commentable
# resources :archived_posts do
# # Don't allow comments on archived posts
# concerns :commentable, only: [:index, :show]
# end
#
# Or, using a callable object, you might implement something more
# specific to your application, which would be out of place in your
# routes file.
#
# # purchasable.rb
# class Purchasable
# def initialize(defaults = {})
# @defaults = defaults
# end
#
# def call(mapper, options = {})
# options = @defaults.merge(options)
# mapper.resources :purchases
# mapper.resources :receipts
# mapper.resources :returns if options[:returnable]
# end
# end
#
# # routes.rb
# concern :purchasable, Purchasable.new(returnable: true)
#
# resources :toys, concerns: :purchasable
# resources :electronics, concerns: :purchasable
# resources :pets do
# concerns :purchasable, returnable: false
# end
#
# Any routing helpers can be used inside a concern. If using a
# callable, they're accessible from the Mapper that's passed to
# call.
def concern(name, callable = nil, &block)
callable ||= lambda { |mapper, options| mapper.instance_exec(options, &block) }
@concerns[name] = callable
end
# Use the named concerns
#
# resources :posts do
# concerns :commentable
# end
#
# Concerns also work in any routes helper that you want to use:
#
# namespace :posts do
# concerns :commentable
# end
def concerns(*args)
options = args.extract_options!
args.flatten.each do |name|
if concern = @concerns[name]
concern.call(self, options)
else
raise ArgumentError, "No concern named #{name} was found!"
end
end
end
end
module CustomUrls
# Define custom URL helpers that will be added to the application's
# routes. This allows you to override and/or replace the default behavior
# of routing helpers, e.g:
#
# direct :homepage do
# "http://www.rubyonrails.org"
# end
#
# direct :commentable do |model|
# [ model, anchor: model.dom_id ]
# end
#
# direct :main do
# { controller: "pages", action: "index", subdomain: "www" }
# end
#
# The return value from the block passed to +direct+ must be a valid set of
# arguments for +url_for+ which will actually build the URL string. This can
# be one of the following:
#
# * A string, which is treated as a generated URL
# * A hash, e.g. { controller: "pages", action: "index" }
# * An array, which is passed to +polymorphic_url+
# * An Active Model instance
# * An Active Model class
#
# NOTE: Other URL helpers can be called in the block but be careful not to invoke
# your custom URL helper again otherwise it will result in a stack overflow error.
#
# You can also specify default options that will be passed through to
# your URL helper definition, e.g:
#
# direct :browse, page: 1, size: 10 do |options|
# [ :products, options.merge(params.permit(:page, :size).to_h.symbolize_keys) ]
# end
#
# In this instance the +params+ object comes from the context in which the
# block is executed, e.g. generating a URL inside a controller action or a view.
# If the block is executed where there isn't a +params+ object such as this:
#
# Rails.application.routes.url_helpers.browse_path
#
# then it will raise a +NameError+. Because of this you need to be aware of the
# context in which you will use your custom URL helper when defining it.
#
# NOTE: The +direct+ method can't be used inside of a scope block such as
# +namespace+ or +scope+ and will raise an error if it detects that it is.
def direct(name, options = {}, &block)
unless @scope.root?
raise RuntimeError, "The direct method can't be used inside a routes scope block"
end
@set.add_url_helper(name, options, &block)
end
# Define custom polymorphic mappings of models to URLs. This alters the
# behavior of +polymorphic_url+ and consequently the behavior of
# +link_to+ and +form_for+ when passed a model instance, e.g:
#
# resource :basket
#
# resolve "Basket" do
# [:basket]
# end
#
# This will now generate "/basket" when a +Basket+ instance is passed to
# +link_to+ or +form_for+ instead of the standard "/baskets/:id".
#
# NOTE: This custom behavior only applies to simple polymorphic URLs where
# a single model instance is passed and not more complicated forms, e.g:
#
# # config/routes.rb
# resource :profile
# namespace :admin do
# resources :users
# end
#
# resolve("User") { [:profile] }
#
# # app/views/application/_menu.html.erb
# link_to "Profile", @current_user
# link_to "Profile", [:admin, @current_user]
#
# The first +link_to+ will generate "/profile" but the second will generate
# the standard polymorphic URL of "/admin/users/1".
#
# You can pass options to a polymorphic mapping - the arity for the block
# needs to be two as the instance is passed as the first argument, e.g:
#
# resolve "Basket", anchor: "items" do |basket, options|
# [:basket, options]
# end
#
# This generates the URL "/basket#items" because when the last item in an
# array passed to +polymorphic_url+ is a hash then it's treated as options
# to the URL helper that gets called.
#
# NOTE: The +resolve+ method can't be used inside of a scope block such as
# +namespace+ or +scope+ and will raise an error if it detects that it is.
def resolve(*args, &block)
unless @scope.root?
raise RuntimeError, "The resolve method can't be used inside a routes scope block"
end
options = args.extract_options!
args = args.flatten(1)
args.each do |klass|
@set.add_polymorphic_mapping(klass, options, &block)
end
end
end
class Scope # :nodoc:
OPTIONS = [:path, :shallow_path, :as, :shallow_prefix, :module,
:controller, :action, :path_names, :constraints,
:shallow, :blocks, :defaults, :via, :format, :options, :to]
RESOURCE_SCOPES = [:resource, :resources]
RESOURCE_METHOD_SCOPES = [:collection, :member, :new]
attr_reader :parent, :scope_level
def initialize(hash, parent = NULL, scope_level = nil)
@hash = hash
@parent = parent
@scope_level = scope_level
end
def nested?
scope_level == :nested
end
def null?
@hash.nil? && @parent.nil?
end
def root?
@parent.null?
end
def resources?
scope_level == :resources
end
def resource_method_scope?
RESOURCE_METHOD_SCOPES.include? scope_level
end
def action_name(name_prefix, prefix, collection_name, member_name)
case scope_level
when :nested
[name_prefix, prefix]
when :collection
[prefix, name_prefix, collection_name]
when :new
[prefix, :new, name_prefix, member_name]
when :member
[prefix, name_prefix, member_name]
when :root
[name_prefix, collection_name, prefix]
else
[name_prefix, member_name, prefix]
end
end
def resource_scope?
RESOURCE_SCOPES.include? scope_level
end
def options
OPTIONS
end
def new(hash)
self.class.new hash, self, scope_level
end
def new_level(level)
self.class.new(frame, self, level)
end
def [](key)
scope = find { |node| node.frame.key? key }
scope && scope.frame[key]
end
include Enumerable
def each
node = self
until node.equal? NULL
yield node
node = node.parent
end
end
def frame; @hash; end
NULL = Scope.new(nil, nil)
end
def initialize(set) #:nodoc:
@set = set
@scope = Scope.new(path_names: @set.resources_path_names)
@concerns = {}
end
include Base
include HttpHelpers
include Redirection
include Scoping
include Concerns
include Resources
include CustomUrls
end
end
end