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

Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
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.

Constant Summary

CANONICAL_ACTIONS =
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1174
```
%w(index create new show update destroy)
```
RESOURCE_OPTIONS =
# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1173
```
[:as, :controller, :path, :only, :except, :param, :concerns]
```
VALID_ON_OPTIONS =

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

# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1172
```
[:new, :collection, :member]
```

Instance Attribute Summary

#shallow readonly
#shallow? ⇒ Boolean readonly

Instance Method Summary

#collection(&block)

To add a route to the collection:
#draw(name)

Loads another routes file with the given name located inside the config/routes directory.
#match(path, *rest, &block)

Matches a URL pattern to one or more routes.
#member(&block)

To add a member route, add a member block into the resource block:
#namespace(path, options = {})

See Scoping#namespace.
#nested(&block)
#new(&block)
#resource(*resources, &block)

Sometimes, you have a resource that clients always look up without referencing an ID.
#resources(*resources, &block)

In Rails, a resourceful route provides a mapping between HTTP verbs and URLs and controller actions.
#resources_path_names(options)
#root(path, options = {})

You can specify what ::Rails should route “/” to with the root method:

Instance Attribute Details

#shallow (readonly)

[ GitHub ]

# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1624


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

#shallow? ⇒ `Boolean` (readonly)

[ GitHub ]

# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1631


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

Instance Method Details

#collection(&block)

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.

[ GitHub ]

# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1548


def collection(&block)
  unless resource_scope?
    raise ArgumentError, "can't use collection outside resource(s) scope"
  end

  with_scope_level(:collection) do
    path_scope(parent_resource.collection_scope, &block)
  end
end

#draw(name)

Loads another routes file with the given name located inside the config/routes directory. In that file, you can use the normal routing DSL, but *do not* surround it with a Rails.application.routes.draw block.

# config/routes.rb
Rails.application.routes.draw do
  draw :admin                 # Loads {config/routes/admin.rb}
  draw "third_party/some_gem" # Loads {config/routes/third_party/some_gem.rb}
end

# config/routes/admin.rb
namespace :admin do
  resources :accounts
end

# config/routes/third_party/some_gem.rb
mount SomeGem::Engine, at: "/some_gem"

CAUTION: Use this feature with care. Having multiple routes files can negatively impact discoverability and readability. For most applications —even those with a few hundred routes — it’s easier for developers to have a single routes file.

[ GitHub ]

# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1657


def draw(name)
  path = @draw_paths.find do |_path|
    File.exist? "#{_path}/#{name}.rb"
  end

  unless path
    msg  = "Your router tried to #draw the external file #{name}.rb,\n" \
           "but the file was not found in:\n\n"
    msg += @draw_paths.map { |_path| " * #{_path}" }.join("\n")
    raise ArgumentError, msg
  end

  route_path = "#{path}/#{name}.rb"
  instance_eval(File.read(route_path), route_path.to_s)
end

#match(path, *rest, &block)

Matches a URL pattern to one or more routes. For more information, see [match](Base#match).

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

[ GitHub ]

# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1679


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 to.include?("#")
        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

#member(&block)

To add a member route, add a member block into the resource block:

resources :photos do
  member do
    get 'preview'
  end
end

This will recognize /photos/1/preview with GET, and route to the preview action of PhotosController. It will also create the preview_photo_url and preview_photo_path helpers.

[ GitHub ]

# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1569


def member(&block)
  unless resource_scope?
    raise ArgumentError, "can't use member outside resource(s) scope"
  end

  with_scope_level(:member) do
    if shallow?
      shallow_scope {
        path_scope(parent_resource.member_scope, &block)
      }
    else
      path_scope(parent_resource.member_scope, &block)
    end
  end
end

#namespace(path, options = {})

See Scoping#namespace.

[ GitHub ]

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


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

#nested(&block)

[ GitHub ]

# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1595


def nested(&block)
  unless resource_scope?
    raise ArgumentError, "can't use nested outside resource(s) scope"
  end

  with_scope_level(:nested) do
    if shallow? && shallow_nesting_depth >= 1
      shallow_scope do
        path_scope(parent_resource.nested_scope) do
          scope(nested_options, &block)
        end
      end
    else
      path_scope(parent_resource.nested_scope) do
        scope(nested_options, &block)
      end
    end
  end
end

#new(&block)

[ GitHub ]

# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1585


def new(&block)
  unless resource_scope?
    raise ArgumentError, "can't use new outside resource(s) scope"
  end

  with_scope_level(:new) do
    path_scope(parent_resource.new_scope(action_path(:new)), &block)
  end
end

#resource(*resources, &block)

resource :profile

This creates six different routes in your application, all mapping to the Profiles controller (note that the controller is named after the plural):

GET       /profile/new
GET       /profile
GET       /profile/edit
PATCH/PUT /profile
DELETE    /profile
POST      /profile

If you want instances of a model to work with this resource via record identification (e.g. in form_with or redirect_to), you will need to call [resolve](CustomUrls#resolve):

resource :profile
resolve('Profile') { [:profile] }

# Enables this to work with singular routes:
form_with(model: @profile) {}

Options

Takes same options as [resources](#resources)

[ GitHub ]

# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1337


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)

In Rails, a resourceful route provides a mapping between HTTP verbs and URLs and controller actions. By convention, each action also maps to particular CRUD operations in a database. A single entry in the routing file, such as

resources :photos

creates seven different routes in your application, all mapping to the Photos controller:

GET       /photos
GET       /photos/new
POST      /photos
GET       /photos/:id
GET       /photos/:id/edit
PATCH/PUT /photos/:id
DELETE    /photos/:id

Resources can also be nested infinitely by using this block syntax:

resources :photos do
  resources :comments
end

This generates the following comments routes:

GET       /photos/:photo_id/comments
GET       /photos/:photo_id/comments/new
POST      /photos/:photo_id/comments
GET       /photos/:photo_id/comments/:id
GET       /photos/:photo_id/comments/:id/edit
PATCH/PUT /photos/:photo_id/comments/:id
DELETE    /photos/:photo_id/comments/:id

Options

Takes same options as [match](Base#match) as well as:

:path_names : Allows you to change the segment component of the edit and #new

actions. Actions not specified are not changed.

    resources :posts, path_names: { new: "brand_new" }

The above example will now change /posts/new to /posts/brand_new.

:path : Allows you to change the path prefix for the resource.

    resources :posts, path: 'postings'

The resource and all segments will now route to /postings instead of
/posts.

:only : Only generate routes for the given actions.

resources :cows, only: :show
resources :cows, only: [:show, :index]

:except : Generate all routes except for the given actions.

resources :cows, except: :show
resources :cows, except: [:show, :index]

:shallow : Generates shallow routes for nested resource(s). When placed on a parent

resource, generates shallow routes for all nested resources.

    resources :posts, shallow: true do
      resources :comments
    end

Is the same as:

    resources :posts do
      resources :comments, except: [:show, :edit, :update, :destroy]
    end
    resources :comments, only: [:show, :edit, :update, :destroy]

This allows URLs for resources that otherwise would be deeply nested such
as a comment on a blog post like {/posts/a-long-permalink/comments/1234}
to be shortened to just {/comments/1234}.

Set `shallow: false` on a child resource to ignore a parent's shallow
parameter.

:shallow_path : Prefixes nested shallow routes with the specified path.

    scope shallow_path: "sekret" do
      resources :posts do
        resources :comments, shallow: true
      end
    end

The {comments} resource here will have the following routes generated for
it:

    post_comments    GET       /posts/:post_id/comments(.:format)
    post_comments    POST      /posts/:post_id/comments(.:format)
    new_post_comment GET       /posts/:post_id/comments/new(.:format)
    edit_comment     GET       /sekret/comments/:id/edit(.:format)
    comment          GET       /sekret/comments/:id(.:format)
    comment          PATCH/PUT /sekret/comments/:id(.:format)
    comment          DELETE    /sekret/comments/:id(.:format)

:shallow_prefix : Prefixes nested shallow route names with specified prefix.

    scope shallow_prefix: "sekret" do
      resources :posts do
        resources :comments, shallow: true
      end
    end

The {comments} resource here will have the following routes generated for
it:

    post_comments           GET       /posts/:post_id/comments(.:format)
    post_comments           POST      /posts/:post_id/comments(.:format)
    new_post_comment        GET       /posts/:post_id/comments/new(.:format)
    edit_sekret_comment     GET       /comments/:id/edit(.:format)
    sekret_comment          GET       /comments/:id(.:format)
    sekret_comment          PATCH/PUT /comments/:id(.:format)
    sekret_comment          DELETE    /comments/:id(.:format)

:format : Allows you to specify the default value for optional format segment or

disable it by supplying {false}.

:param : Allows you to override the default param name of :id in the URL.

Examples

# routes call {Admin::PostsController}
resources :posts, module: "admin"

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

[ GitHub ]

# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1507


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)

[ GitHub ]

# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1304


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

#root(path, options = {})

You can specify what ::Rails should route “/” to with the root method:

root to: 'pages#main'

For options, see #match, as root uses it internally.

You can also pass a string which will expand

root 'pages#main'

You should put the root route at the top of config/routes.rb, because this means it will be matched first. As this is the most popular route of most ::Rails applications, this is beneficial.

[ GitHub ]

# File 'actionpack/lib/action_dispatch/routing/mapper.rb', line 1726


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

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

Overview

Constant Summary

Instance Attribute Summary

Instance Method Summary

Instance Attribute Details

#shallow (readonly)

#shallow? ⇒ Boolean (readonly)

Instance Method Details

#collection(&block)

#draw(name)

#match(path, *rest, &block)

#member(&block)

#namespace(path, options = {})

#nested(&block)

#new(&block)

#resource(*resources, &block)

Options

#resources(*resources, &block)

Options

Examples

#resources_path_names(options)

#root(path, options = {})

#shallow? ⇒ `Boolean` (readonly)