Module: ActionDispatch::Routing::Mapper::Resources

Included in:
ActionDispatch::Routing::Mapper
Defined in:
actionpack/lib/action_dispatch/routing/mapper.rb

Overview

Resource routing allows you to quickly declare all of the common routes for a given resourceful controller. Instead of declaring separate routes for your index, show, new, edit, create, update and destroy actions, a resourceful route declares them in a single line of code:

resources :photos

Sometimes, you have a resource that clients always look up without referencing an ID. A common example, /profile always shows the profile of the currently logged in user. In this case, you can use a singular resource to map /profile (rather than /profile/:id) to the show action.

resource :profile

It's common to have resources that are logically children of other resources:

resources :magazines do
  resources :ads
end

You may wish to organize groups of controllers under a namespace. Most commonly, you might group a number of administrative controllers under an admin namespace. You would place these controllers under the app/controllers/admin directory, and you can group them together in your router:

namespace "admin" do
  resources :posts, :comments
end

By default the :id parameter doesn't accept dots. If you need to use dots as part of the :id parameter add a constraint which overrides this restriction, e.g:

resources :articles, id: /[^\/]+/

This allows any character other than a slash as part of your :id.

Defined Under Namespace

Classes: Resource, SingletonResource

Constant Summary collapse

VALID_ON_OPTIONS =

CANONICAL_ACTIONS holds all actions that does not need a prefix or a path appended since they fit properly in their scope level.

[:new, :collection, :member]
RESOURCE_OPTIONS =
[:as, :controller, :path, :only, :except, :param, :concerns]
CANONICAL_ACTIONS =
%w(index create new show update destroy)

Instance Method Summary collapse

Instance Method Details

#add_route(action, controller, options, _path, to, via, formatted, anchor, options_constraints) ⇒ Object

:nodoc:

Raises:

  • (ArgumentError)

1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1633

def add_route(action, controller, options, _path, to, via, formatted, anchor, options_constraints) # :nodoc:
  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 action =~ /^[\w\-\/]+$/
    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, ast, as, anchor)
end

#collectionObject

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.


1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1468

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

#decomposed_match(path, controller, options, _path, to, via, formatted, anchor, options_constraints) ⇒ Object

:nodoc:


1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1618

def decomposed_match(path, controller, options, _path, to, via, formatted, anchor, options_constraints) # :nodoc:
  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

#get_to_from_path(path, to, action) ⇒ Object


1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1603

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

#match(path, *rest, &block) ⇒ Object

Matches a url pattern to one or more routes. For more information, see match.

match 'path' => 'controller#action', via: patch
match 'path', to: 'controller#action', via: :post
match 'path', 'otherpath', on: :member, via: :get

1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1565

def match(path, *rest, &block)
  if rest.empty? && Hash === path
    options  = path
    path, to = options.find { |name, _value| name.is_a?(String) }

    if path.nil?
      ActiveSupport::Deprecation.warn 'Omitting the route path is deprecated. '\
        'Specify the path with a String or a Symbol instead.'
      path = ''
    end

    case to
    when Symbol
      options[:action] = to
    when String
      if 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

#memberObject

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.


1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1491

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

#namespace(path, options = {}) ⇒ Object

See ActionDispatch::Routing::Mapper::Scoping#namespace


1540
1541
1542
1543
1544
1545
1546
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1540

def namespace(path, options = {})
  if resource_scope?
    nested { super }
  else
    super
  end
end

#nestedObject


1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1519

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

#newObject


1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1507

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

#resource(*resources, &block) ⇒ Object

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

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.


1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1265

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

#resources(*resources, &block) ⇒ Object

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 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 <tt>Admin::PostsController</tt>
resources :posts, module: "admin"

# resource actions are at /admin/posts.
resources :posts, path: "admin/posts"

1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1426

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

#resources_path_names(options) ⇒ Object


1240
1241
1242
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1240

def resources_path_names(options)
  @scope[:path_names].merge!(options)
end

#root(path, options = {}) ⇒ Object

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.


1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1673

def root(path, options = {})
  if path.is_a?(String)
    options[:to] = path
  elsif path.is_a?(Hash) and 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

#shallowObject


1548
1549
1550
1551
1552
1553
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1548

def shallow
  @scope = @scope.new(shallow: true)
  yield
ensure
  @scope = @scope.parent
end

#shallow?Boolean

Returns:

  • (Boolean)

1555
1556
1557
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1555

def shallow?
  !parent_resource.singleton? && @scope[:shallow]
end

#using_match_shorthand?(path) ⇒ Boolean

Returns:

  • (Boolean)

1614
1615
1616
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1614

def using_match_shorthand?(path)
  path =~ %r{^/?[-\w]+/[-\w/]+$}
end