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into your config/routesrb file, you will have created four named routes, which, in a manner to be described in this chapter, connect to seven controller actions And those actions have nice CRUD-like names, as you will see
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Like most of Rails, support for RESTful applications is opinionated ; that is, it offers a particular way of designing a REST interface, and the more you play along, the more convenience you reap from it Most Rails applications are database-backed, and the Rails take on REST tends to associate a resource very closely with an Active Record model, or a model/controller stack In fact, you ll hear people using the terminology fairly loosely For instance, they ll say that they have created a Book resource What they mean, in most cases, is that they have created a Book model, a book controller with a set of CRUD actions, and some named routes pertaining to that controller (courtesy of resources :books) You can have a Book model and controller, but what you actually present to the world as your resources, in the REST sense, exists at a higher level of abstraction: The Little Prince, borrowing history, and so on The best way to get a handle on the REST support in Rails is by going from the known to the unknown In this case, from the topic of named routes to the more specialized topic of REST
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342 From Named Routes to REST Support
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When we first looked at named routes, we saw examples where we consolidated things into a route name By creating a route like
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match 'auctions/:id' => "auction#show", :as => 'auction'
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you gain the ability to use nice helper methods in situations like
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link_to itemdescription, auction_path(itemauction)
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The route ensures that a path will be generated that will trigger the show action of the auctions controller The attraction of this kind of named route is that it s concise and readable Now, think in terms of CRUD The named route auction_path is a nice fit for a show (the R in CRUD) action What if we wanted similarly nicely named routes for the create, update, and delete actions
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3: REST, Resources, and Rails
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Well, we ve used up the route name auction_path on the show action We could make up names like auction_delete_path and auction_create_path but those are cumbersome We really want to be able to make a call to auction_path and have it mean different things, depending on which action we want the URL to point to We could differentiate between the singular (auction_path) and the plural (auctions_path) A singular URL makes sense, semantically, when you re doing something with a single, existing auction object If you re doing something with auctions in general, the plural makes more sense The kinds of things you do with auctions in general include creating The create action will normally occur in a form:
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form_tag auctions_path
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It s plural because we re not saying perform an action with respect to a particular auction, but rather with respect to the collection of auctions, perform the action of creation Yes, we re creating one auction, not many But at the time we make the call to our named route, auctions_path, we re addressing auctions in general Another case where you might want a plural named route is when you want an overview of all of the objects of a particular kind, or at least, some kind of general view, rather than a display of a particular object This kind of general view is usually handled with an index action These index actions typically load a lot of data into one or more variables, and the corresponding view displays it as a list or table (possibly more than one) Here again, we d like to be able to say:
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