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require 'active_support/core_ext/hash/except'
require 'active_support/core_ext/hash/reverse_merge'
require 'active_support/core_ext/hash/slice'
require 'active_support/core_ext/object/blank'
require 'active_support/core_ext/enumerable'
require 'active_support/inflector'
require 'action_dispatch/routing/redirection'
module ActionDispatch
module Routing
class Mapper
class Constraints #:nodoc:
def self.new(app, constraints, request = Rack::Request)
if constraints.any?
super(app, constraints, request)
else
app
end
end
attr_reader :app, :constraints
def initialize(app, constraints, request)
@app, @constraints, @request = app, constraints, request
end
def matches?(env)
req = @request.new(env)
@constraints.each { |constraint|
if constraint.respond_to?(:matches?) && !constraint.matches?(req)
return false
elsif constraint.respond_to?(:call) && !constraint.call(*constraint_args(constraint, req))
return false
end
}
return true
ensure
req.reset_parameters
end
def call(env)
matches?(env) ? @app.call(env) : [ 404, {'X-Cascade' => 'pass'}, [] ]
end
private
def constraint_args(constraint, request)
constraint.arity == 1 ? [request] : [request.symbolized_path_parameters, request]
end
end
class Mapping #:nodoc:
IGNORE_OPTIONS = [:to, :as, :via, :on, :constraints, :defaults, :only, :except, :anchor, :shallow, :shallow_path, :shallow_prefix]
ANCHOR_CHARACTERS_REGEX = %r{\A(\\A|\^)|(\\Z|\\z|\$)\Z}
SHORTHAND_REGEX = %r{/[\w/]+$}
WILDCARD_PATH = %r{\*([^/\)]+)\)?$}
def initialize(set, scope, path, options)
@set, @scope = set, scope
@segment_keys = nil
@options = (@scope[:options] || {}).merge(options)
@path = normalize_path(path)
normalize_options!
via_all = @options.delete(:via) if @options[:via] == :all
if !via_all && request_method_condition.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 GET, use `get` in the router:\n\n" \
" Instead of: match \"controller#action\"\n" \
" Do: get \"controller#action\""
raise msg
end
end
def to_route
[ app, conditions, requirements, defaults, @options[:as], @options[:anchor] ]
end
private
def normalize_options!
path_without_format = @path.sub(/\(\.:format\)$/, '')
if using_match_shorthand?(path_without_format, @options)
to_shorthand = @options[:to].blank?
@options[:to] ||= path_without_format.gsub(/\(.*\)/, "")[1..-1].sub(%r{/([^/]*)$}, '#\1')
end
@options.merge!(default_controller_and_action(to_shorthand))
requirements.each do |name, requirement|
# segment_keys.include?(k.to_s) || k == :controller
next unless Regexp === requirement && !constraints[name]
if requirement.source =~ ANCHOR_CHARACTERS_REGEX
raise ArgumentError, "Regexp anchor characters are not allowed in routing requirements: #{requirement.inspect}"
end
if requirement.multiline?
raise ArgumentError, "Regexp multiline option not allowed in routing requirements: #{requirement.inspect}"
end
end
if @options[:constraints].is_a?(Hash)
(@options[:defaults] ||= {}).reverse_merge!(defaults_from_constraints(@options[:constraints]))
end
end
# match "account/overview"
def using_match_shorthand?(path, options)
path && (options[:to] || options[:action]).nil? && path =~ SHORTHAND_REGEX
end
def normalize_path(path)
raise ArgumentError, "path is required" if path.blank?
path = Mapper.normalize_path(path)
if path.match(':controller')
raise ArgumentError, ":controller segment is not allowed within a namespace block" if @scope[:module]
# 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
# Add a constraint for wildcard route to make it non-greedy and match the
# optional format part of the route by default
if path.match(WILDCARD_PATH) && @options[:format] != false
@options[$1.to_sym] ||= /.+?/
end
if @options[:format] == false
@options.delete(:format)
path
elsif path.include?(":format") || path.end_with?('/')
path
elsif @options[:format] == true
"#{path}.:format"
else
"#{path}(.:format)"
end
end
def app
Constraints.new(
to.respond_to?(:call) ? to : Routing::RouteSet::Dispatcher.new(:defaults => defaults),
blocks,
@set.request_class
)
end
def conditions
{ :path_info => @path }.merge(constraints).merge(request_method_condition)
end
def requirements
@requirements ||= (@options[:constraints].is_a?(Hash) ? @options[:constraints] : {}).tap do |requirements|
requirements.reverse_merge!(@scope[:constraints]) if @scope[:constraints]
@options.each { |k, v| requirements[k] = v if v.is_a?(Regexp) }
end
end
def defaults
@defaults ||= (@options[:defaults] || {}).tap do |defaults|
defaults.reverse_merge!(@scope[:defaults]) if @scope[:defaults]
@options.each { |k, v| defaults[k] = v unless v.is_a?(Regexp) || IGNORE_OPTIONS.include?(k.to_sym) }
end
end
def default_controller_and_action(to_shorthand=nil)
if to.respond_to?(:call)
{ }
else
if to.is_a?(String)
controller, action = to.split('#')
elsif to.is_a?(Symbol)
action = to.to_s
end
controller ||= default_controller
action ||= default_action
unless controller.is_a?(Regexp) || to_shorthand
controller = [@scope[:module], controller].compact.join("/").presence
end
if controller.is_a?(String) && controller =~ %r{\A/}
raise ArgumentError, "controller name should not start with a slash"
end
controller = controller.to_s unless controller.is_a?(Regexp)
action = action.to_s unless action.is_a?(Regexp)
if controller.blank? && segment_keys.exclude?("controller")
raise ArgumentError, "missing :controller"
end
if action.blank? && segment_keys.exclude?("action")
raise ArgumentError, "missing :action"
end
hash = {}
hash[:controller] = controller unless controller.blank?
hash[:action] = action unless action.blank?
hash
end
end
def blocks
constraints = @options[:constraints]
if constraints.present? && !constraints.is_a?(Hash)
[constraints]
else
@scope[:blocks] || []
end
end
def constraints
@constraints ||= requirements.reject { |k, v| segment_keys.include?(k.to_s) || k == :controller }
end
def request_method_condition
if via = @options[:via]
list = Array(via).map { |m| m.to_s.dasherize.upcase }
{ :request_method => list }
else
{ }
end
end
def segment_keys
return @segment_keys if @segment_keys
@segment_keys = Journey::Path::Pattern.new(
Journey::Router::Strexp.compile(@path, requirements, SEPARATORS)
).names
end
def to
@options[:to]
end
def default_controller
@options[:controller] || @scope[:controller]
end
def default_action
@options[:action] || @scope[:action]
end
def defaults_from_constraints(constraints)
url_keys = [:protocol, :subdomain, :domain, :host, :port]
constraints.slice(*url_keys).select{ |k, v| v.is_a?(String) || v.is_a?(Fixnum) }
end
end
# Invokes Rack::Mount::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{^/\(+[^/]+\)$}
path
end
def self.normalize_name(name)
normalize_path(name)[1..-1].tr("/", "_")
end
module Base
# 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 <tt>config/routes.rb</tt>,
# because this means it will be matched first. As this is the most popular route
# of most Rails applications, this is beneficial.
def root(options = {})
options = { :to => options } if options.is_a?(String)
match '/', { :as => :root, :via => :get }.merge(options)
end
# Matches a url pattern to one or more routes. Any symbols in a pattern
# are interpreted as url query parameters and thus available as +params+
# in an action:
#
# # sets :controller, :action and :id in params
# match ':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:
#
# match 'songs/*category/:title' => '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'
# match 'photos/:id', :to => 'photos#show'
# match 'photos/:id', :controller => 'photos', :action => 'show'
#
# A pattern can also point to a +Rack+ endpoint i.e. anything that
# responds to +call+:
#
# match 'photos/:id' => lambda {|hash| [200, {}, "Coming soon"] }
# match 'photos/:id' => PhotoRackApp
# # Yes, controller actions are just rack endpoints
# match 'photos/:id' => PhotosController.action(:show)
#
# === Options
#
# Any options not seen here are passed on as params with the url.
#
# [:controller]
# The route's controller.
#
# [:action]
# The route's action.
#
# [:path]
# The path prefix for the routes.
#
# [:module]
# The namespace for :controller.
#
# match 'path' => 'c#a', :module => 'sekret', :controller => 'posts'
# #=> Sekret::PostsController
#
# See <tt>Scoping#namespace</tt> for its scope equivalent.
#
# [:as]
# The name used to generate routing helpers.
#
# [:via]
# Allowed HTTP verb(s) for route.
#
# match 'path' => 'c#a', :via => :get
# match 'path' => 'c#a', :via => [:get, :post]
#
# [: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'
# match 'path', :to => lambda { |env| [200, {}, "Success!"] }
# match 'path', :to => RackApp
#
# [:on]
# Shorthand for wrapping routes in a specific RESTful context. Valid
# values are +:member+, +:collection+, and +:new+. Only use within
# <tt>resource(s)</tt> block. For example:
#
# resource :bar do
# match 'foo' => 'c#a', :on => :member, :via => [:get, :post]
# end
#
# Is equivalent to:
#
# resource :bar do
# member do
# match 'foo' => 'c#a', :via => [:get, :post]
# end
# end
#
# [:constraints]
# Constrains parameters with a hash of regular expressions or an
# object that responds to <tt>matches?</tt>
#
# match 'path/:id', :constraints => { :id => /[A-Z]\d{5}/ }
#
# class Blacklist
# def matches?(request) request.remote_ip == '1.2.3.4' end
# end
# match 'path' => 'c#a', :constraints => Blacklist.new
#
# See <tt>Scoping#constraints</tt> for more examples with its scope
# equivalent.
#
# [:defaults]
# Sets defaults for parameters
#
# # Sets params[:format] to 'jpg' by default
# match 'path' => 'c#a', :defaults => { :format => 'jpg' }
#
# See <tt>Scoping#defaults</tt> for its scope equivalent.
#
# [:anchor]
# Boolean to anchor a <tt>match</tt> 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' => 'c#a', :anchor => 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)
else
options = app
app, path = options.find { |k, v| k.respond_to?(:call) }
options.delete(app) if app
end
raise "A rack application must be specified" unless path
options[:as] ||= app_name(app)
match(path, options.merge(:to => app, :anchor => false, :format => false, :via => :all))
define_generate_prefix(app, options[:as])
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
private
def app_name(app)
return unless app.respond_to?(:routes)
if app.respond_to?(:railtie_name)
app.railtie_name
else
class_name = app.class.is_a?(Class) ? app.name : app.class.name
ActiveSupport::Inflector.underscore(class_name).tr("/", "_")
end
end
def define_generate_prefix(app, name)
return unless app.respond_to?(:routes) && app.routes.respond_to?(:define_mounted_helper)
_route = @set.named_routes.routes[name.to_sym]
_routes = @set
app.routes.define_mounted_helper(name)
app.routes.singleton_class.class_eval do
define_method :mounted? do
true
end
define_method :_generate_prefix do |options|
prefix_options = options.slice(*_route.segment_keys)
# we must actually delete prefix segment keys to avoid passing them to next url_for
_route.segment_keys.each { |k| options.delete(k) }
prefix = _routes.url_helpers.send("#{name}_path", prefix_options)
prefix = '' if prefix == '/'
prefix
end
end
end
end
module HttpHelpers
# Define a route that only recognizes HTTP GET.
# For supported arguments, see <tt>Base#match</tt>.
#
# 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 <tt>Base#match</tt>.
#
# 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 <tt>Base#match</tt>.
#
# 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 <tt>Base#match</tt>.
#
# 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 <tt>Base#match</tt>.
#
# 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
options[:path] ||= args.first if args.first.is_a?(String)
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 <tt>app/controllers/admin</tt> 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 <tt>Admin::PostsController</tt>, 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
# <tt>Admin::PostsController</tt>, 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 <tt>Base#match</tt> and <tt>Resources#resources</tt>.
#
# === Examples
#
# # route /posts (without the prefix /admin) to <tt>Admin::PostsController</tt>
# 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!
options = options.dup
options[:path] = args.first if args.first.is_a?(String)
recover = {}
options[:constraints] ||= {}
unless options[:constraints].is_a?(Hash)
block, options[:constraints] = options[:constraints], {}
end
if options[:constraints].is_a?(Hash)
(options[:defaults] ||= {}).reverse_merge!(defaults_from_constraints(options[:constraints]))
end
scope_options.each do |option|
if value = options.delete(option)
recover[option] = @scope[option]
@scope[option] = send("merge_#{option}_scope", @scope[option], value)
end
end
recover[:block] = @scope[:blocks]
@scope[:blocks] = merge_blocks_scope(@scope[:blocks], block)
recover[:options] = @scope[:options]
@scope[:options] = merge_options_scope(@scope[:options], options)
yield
self
ensure
scope_options.each do |option|
@scope[option] = recover[option] if recover.has_key?(option)
end
@scope[:options] = recover[:options]
@scope[:blocks] = recover[:block]
end
# Scopes routes to a specific controller
#
# controller "food" do
# match "bacon", :action => "bacon"
# end
def controller(controller, options={})
options[:controller] = controller
scope(options) { yield }
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 <tt>Base#match</tt>. For +:shallow_path+ option, see
# <tt>Resources#resources</tt>.
#
# === Examples
#
# # accessible through /sekret/posts rather than /admin/posts
# namespace :admin, :path => "sekret" do
# resources :posts
# end
#
# # maps to <tt>Sekret::PostsController</tt> rather than <tt>Admin::PostsController</tt>
# 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
options = { :path => path, :as => path, :module => path,
:shallow_path => path, :shallow_prefix => path }.merge!(options)
scope(options) { yield }
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(lambda { |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(:defaults => defaults) { yield }
end
private
def scope_options #:nodoc:
@scope_options ||= private_methods.grep(/^merge_(.+)_scope$/) { $1.to_sym }
end
def merge_path_scope(parent, child) #:nodoc:
Mapper.normalize_path("#{parent}/#{child}")
end
def merge_shallow_path_scope(parent, child) #:nodoc:
Mapper.normalize_path("#{parent}/#{child}")
end
def merge_as_scope(parent, child) #:nodoc:
parent ? "#{parent}_#{child}" : child
end
def merge_shallow_prefix_scope(parent, child) #:nodoc:
parent ? "#{parent}_#{child}" : child
end
def merge_module_scope(parent, child) #:nodoc:
parent ? "#{parent}/#{child}" : child
end
def merge_controller_scope(parent, child) #:nodoc:
child
end
def merge_path_names_scope(parent, child) #:nodoc:
merge_options_scope(parent, child)
end
def merge_constraints_scope(parent, child) #:nodoc:
merge_options_scope(parent, child)
end
def merge_defaults_scope(parent, child) #:nodoc:
merge_options_scope(parent, child)
end
def merge_blocks_scope(parent, child) #:nodoc:
merged = parent ? parent.dup : []
merged << child if child
merged
end
def merge_options_scope(parent, child) #:nodoc:
(parent || {}).except(*override_keys(child)).merge(child)
end
def merge_shallow_scope(parent, child) #:nodoc:
child ? true : false
end
def override_keys(child) #:nodoc:
child.key?(:only) || child.key?(:except) ? [:only, :except] : []
end
def defaults_from_constraints(constraints)
url_keys = [:protocol, :subdomain, :domain, :host, :port]
constraints.slice(*url_keys).select{ |k, v| v.is_a?(String) || v.is_a?(Fixnum) }
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
# <tt>app/controllers/admin</tt> 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]
CANONICAL_ACTIONS = %w(index create new show update destroy)
class Resource #:nodoc:
attr_reader :controller, :path, :options, :param
def initialize(entities, options = {})
@name = entities.to_s
@path = (options[:path] || @name).to_s
@controller = (options[:controller] || @name).to_s
@as = options[:as]
@param = options[:param] || :id
@options = options
end
def default_actions
[:index, :create, :new, :show, :update, :destroy, :edit]
end
def actions
if only = @options[:only]
Array(only).map(&:to_sym)
elsif except = @options[:except]
default_actions - Array(except).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 => controller }
end
alias :collection_scope :path
def member_scope
"#{path}/:#{param}"
end
def new_scope(new_path)
"#{path}/#{new_path}"
end
def nested_scope
"#{path}/:#{singular}_#{param}"
end
end
class SingletonResource < Resource #:nodoc:
def initialize(entities, options)
super
@as = nil
@controller = (options[:controller] || plural).to_s
@as = options[:as]
end
def default_actions
[:show, :create, :update, :destroy, :new, :edit]
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
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 :geocoder
#
# creates six different routes in your application, all mapping to
# the +GeoCoders+ controller (note that the controller is named after
# the plural):
#
# GET /geocoder/new
# POST /geocoder
# GET /geocoder
# GET /geocoder/edit
# PATCH/PUT /geocoder
# DELETE /geocoder
#
# === Options
# Takes same options as +resources+.
def resource(*resources, &block)
options = resources.extract_options!
if apply_common_behavior_for(:resource, resources, options, &block)
return self
end
resource_scope(:resource, SingletonResource.new(resources.pop, options)) do
yield if block_given?
collection do
post :create
end if parent_resource.actions.include?(:create)
new do
get :new
end if parent_resource.actions.include?(:new)
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
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 <tt>Base#match</tt> 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 <tt>/posts/a-long-permalink/comments/1234</tt>
# to be shortened to just <tt>/comments/1234</tt>.
#
# [: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)
#
# === Examples
#
# # routes call <tt>Admin::PostsController</tt>
# resources :posts, :module => "admin"
#
# # resource actions are at /admin/posts.
# resources :posts, :path => "admin/posts"
def resources(*resources, &block)
options = resources.extract_options!
if apply_common_behavior_for(:resources, resources, options, &block)
return self
end
resource_scope(:resources, Resource.new(resources.pop, options)) do
yield if block_given?
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)
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
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 <tt>/photos/search</tt>
# with GET, and route to the search action of +PhotosController+. It will also
# create the <tt>search_photos_url</tt> and <tt>search_photos_path</tt>
# route helpers.
def collection
unless resource_scope?
raise ArgumentError, "can't use collection outside resource(s) scope"
end
with_scope_level(:collection) do
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 <tt>/photos/1/preview</tt> with GET, and route to the
# preview action of +PhotosController+. It will also create the
# <tt>preview_photo_url</tt> and <tt>preview_photo_path</tt> helpers.
def member
unless resource_scope?
raise ArgumentError, "can't use member outside resource(s) scope"
end
with_scope_level(:member) do
scope(parent_resource.member_scope) do
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
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?
with_exclusive_scope do
if @scope[:shallow_path].blank?
scope(parent_resource.nested_scope, nested_options) { yield }
else
scope(@scope[:shallow_path], :as => @scope[:shallow_prefix]) do
scope(parent_resource.nested_scope, nested_options) { yield }
end
end
end
else
scope(parent_resource.nested_scope, nested_options) { yield }
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(:shallow => true, :shallow_path => @scope[:path]) do
yield
end
end
def shallow?
parent_resource.instance_of?(Resource) && @scope[:shallow]
end
def draw(name)
path = @draw_paths.find do |_path|
File.exists? "#{_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
# match 'path' => 'controller#action'
# match 'path', to: 'controller#action'
# match 'path', 'otherpath', on: :member, via: :get
def match(path, *rest)
if rest.empty? && Hash === path
options = path
path, to = options.find { |name, value| name.is_a?(String) }
options[:to] = to
options.delete(path)
paths = [path]
else
options = rest.pop || {}
paths = [path] + rest
end
options[:anchor] = true unless options.key?(:anchor)
if options[:on] && !VALID_ON_OPTIONS.include?(options[:on])
raise ArgumentError, "Unknown scope #{on.inspect} given to :on"
end
paths.each { |_path| decomposed_match(_path, options.dup) }
self
end
def decomposed_match(path, options) # :nodoc:
if on = options.delete(:on)
send(on) { decomposed_match(path, options) }
else
case @scope[:scope_level]
when :resources
nested { decomposed_match(path, options) }
when :resource
member { decomposed_match(path, options) }
else
add_route(path, options)
end
end
end
def add_route(action, options) # :nodoc:
path = path_for_action(action, options.delete(:path))
if action.to_s =~ /^[\w\/]+$/
options[:action] ||= action unless action.to_s.include?("/")
else
action = nil
end
if !options.fetch(:as, true)
options.delete(:as)
else
options[:as] = name_for_action(options[:as], action)
end
mapping = Mapping.new(@set, @scope, URI.parser.escape(path), options)
app, conditions, requirements, defaults, as, anchor = mapping.to_route
@set.add_route(app, conditions, requirements, defaults, as, anchor)
end
def root(options={})
if @scope[:scope_level] == :resources
with_scope_level(:root) do
scope(parent_resource.path) do
super(options)
end
end
else
super(options)
end
end
protected
def parent_resource #:nodoc:
@scope[:scope_level_resource]
end
def apply_common_behavior_for(method, resources, options, &block) #:nodoc:
if resources.length > 1
resources.each { |r| send(method, r, options, &block) }
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
unless action_options?(options)
options.merge!(scope_action_options) if scope_action_options?
end
false
end
def action_options?(options) #:nodoc:
options[:only] || options[:except]
end
def scope_action_options? #:nodoc:
@scope[:options] && (@scope[:options][:only] || @scope[:options][:except])
end
def scope_action_options #:nodoc:
@scope[:options].slice(:only, :except)
end
def resource_scope? #:nodoc:
[:resource, :resources].include? @scope[:scope_level]
end
def resource_method_scope? #:nodoc:
[:collection, :member, :new].include? @scope[:scope_level]
end
def with_exclusive_scope
begin
old_name_prefix, old_path = @scope[:as], @scope[:path]
@scope[:as], @scope[:path] = nil, nil
with_scope_level(:exclusive) do
yield
end
ensure
@scope[:as], @scope[:path] = old_name_prefix, old_path
end
end
def with_scope_level(kind, resource = parent_resource)
old, @scope[:scope_level] = @scope[:scope_level], kind
old_resource, @scope[:scope_level_resource] = @scope[:scope_level_resource], resource
yield
ensure
@scope[:scope_level] = old
@scope[:scope_level_resource] = old_resource
end
def resource_scope(kind, resource) #:nodoc:
with_scope_level(kind, resource) do
scope(parent_resource.resource_scope) do
yield
end
end
end
def nested_options #:nodoc:
options = { :as => parent_resource.member_name }
options[:constraints] = {
:"#{parent_resource.singular}_id" => id_constraint
} if id_constraint?
options
end
def id_constraint? #:nodoc:
@scope[:constraints] && @scope[:constraints][:id].is_a?(Regexp)
end
def id_constraint #:nodoc:
@scope[:constraints][:id]
end
def canonical_action?(action, flag) #:nodoc:
flag && resource_method_scope? && CANONICAL_ACTIONS.include?(action.to_s)
end
def shallow_scoping? #:nodoc:
shallow? && @scope[:scope_level] == :member
end
def path_for_action(action, path) #:nodoc:
prefix = shallow_scoping? ?
"#{@scope[:shallow_path]}/#{parent_resource.path}/:id" : @scope[:path]
if canonical_action?(action, path.blank?)
prefix.to_s
else
"#{prefix}/#{action_path(action, path)}"
end
end
def action_path(name, path = nil) #:nodoc:
name = name.to_sym if name.is_a?(String)
path || @scope[:path_names][name] || name.to_s
end
def prefix_name_for_action(as, action) #:nodoc:
if as
as.to_s
elsif !canonical_action?(action, @scope[:scope_level])
action.to_s
end
end
def name_for_action(as, action) #:nodoc:
prefix = prefix_name_for_action(as, action)
prefix = Mapper.normalize_name(prefix) if prefix
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
name = case @scope[: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, shallow_scoping? ? @scope[:shallow_prefix] : name_prefix, member_name]
when :root
[name_prefix, collection_name, prefix]
else
[name_prefix, member_name, prefix]
end
if candidate = name.select(&:present?).join("_").presence
# 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 @set.routes.find { |r| r.name == candidate } || candidate !~ /\A[_a-z]/i
else
candidate
end
end
end
end
def initialize(set) #:nodoc:
@set = set
@draw_paths = set.draw_paths
@scope = { :path_names => @set.resources_path_names }
end
include Base
include HttpHelpers
include Redirection
include Scoping
include Resources
end
end
end
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