Ruby on Rails - scoping routes in ruby on rails- ruby on rails tutorial - rails guides - rails tutorial - ruby rails

Rails provides several ways to organize our routes.

Scope by URL:

scope 'admin' do
  get 'dashboard', to: 'administration#dashboard'
  resources 'employees'
end

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This generates the following routes

get       '/admin/dashboard',          to: 'administration#dashboard'
post      '/admin/employees',          to: 'employees#create'
get       '/admin/employees/new',      to: 'employees#new'
get       '/admin/employees/:id/edit', to: 'employees#edit'
get       '/admin/employees/:id',      to: 'employees#show'
patch/put '/admin/employees/:id',      to: 'employees#update'
delete    '/admin/employees/:id',      to: 'employees#destroy'

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It may make more sense, on the server side, to keep some views in a different subfolder, to separate admin views from user views.

Scope by module

scope module: :admin do
  get 'dashboard', to: 'administration#dashboard'
end

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module looks for the controller files under the subfolder of the given name

get       '/dashboard',          to: 'admin/administration#dashboard'

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We can rename the path helpers prefix by adding an "as" paramete

scope 'admin', as: :administration do
  get 'dashboard'
end

# => administration_dashboard_path

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Rails provides a convenient way to do all the above, using the method.
The following declarations are equivalent

namespace :admin do
end

scope 'admin', module: :admin, as: :admin

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Scope by controller

scope controller: :management do
  get 'dashboard'
  get 'performance'
end

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Generate these routes

get       '/dashboard',          to: 'management#dashboard'
get       '/performance',        to: 'management#performance'

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Shallow Nesting

Resource routes accept a : shallow option that helps to shorten URLs where possible. Resources shouldn't be nested more than one level deep. One way to avoid this is by creating shallow routes. The goal is to leave off parent collection URL segments where they are not needed. The end result is that the only nested routes generated are for the :index ,:create , and :new actions. The rest are kept in their own shallow URL context. There are two options for scope to custom shallow routes:

:shallow_path: Prefixes member paths with a specified parameter.

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

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:shallow_prefix: Add specified parameters to named helpers

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

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You can also illustrate shallow routes more by:

resources :auctions, shallow: true do
  resources :bids do
   resources :comments
  end
end

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alternatively coded as follows (if we are block-happy):

resources :auctions do
 shallow do
   resources :bids do
     resources :comments
   end
 end
end

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Resulting routes are

Prefix	Verb	URI Pattern
bid_comments	GET	/bids/:bid_id/comments(.:format)
	POST	/bids/:bid_id/comments(.:format)
new_bid_comment	GET	/bids/:bid_id/comments/new(.:format)
edit_comment	GET	/comments/:id/edit(.:format)
comment	GET	/comments/:id(.:format)
	PATCH	/comments/:id(.:format)
	PUT	/comments/:id(.:format)
	DELETE	/comments/:id(.:format)
auction_bids	GET	/auctions/:auction_id/bids(.:format)
	POST	/auctions/:auction_id/bids(.:format)
new_auction_bid	GET	/auctions/:auction_id/bids/new(.:format)
edit_bid	GET	/bids/:id/edit(.:format)
bid	GET	/bids/:id(.:format)
	PATCH	/bids/:id(.:format)
	PUT	/bids/:id(.:format)
	DELETE	/bids/:id(.:format)
auctions	GET	/auctions(.:format)
	POST	/auctions(.:format)
new_auction	GET	/auctions/new(.:format)
edit_auction	GET	/auctions/:id/edit(.:format)
auction	GET	/auctions/:id(.:format)
	PATCH	/auctions/:id(.:format)
	PUT	/auctions/:id(.:format)
	DELETE	/auctions/:id(.:format)

We analyze the routes generated carefully, We will notice that the nested parts of the URL are only included when they are needed to determine what data to display.

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