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Already, though, the strategy of breaking auction_path out into singular and plural has hit the wall: We ve got two places where we want to use the plural named route One is create; the other is index But they re both going to look like
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How is the routing system going to know that when we use auctions_path as a link versus using it in a form that we mean the create action and not index We need another qualifier, another flag, another variable on which to branch Luckily, we ve got one
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343 Reenter the HTTP Verb
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Form submissions are POSTs by default Index actions are GETs That means that we need to get the routing system to realize that
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are two different things We also have to get the routing system to generate the same URL /auctions but with a different HTTP request method, depending on the circumstances This is what the REST facility of Rails routing does for you It allows you to stipulate that you want /auctions routed differently, depending on the HTTP request method It lets you define named routes with the same name, but with intelligence about their HTTP verbs In short, it uses HTTP verbs to provide that extra data slot necessary to achieve everything you want to achieve in a concise way The way you do this is by using a special routing method: resources Here s what it would look like for auctions:
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resources :auctions
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That s it Making this one call inside routesrb is the equivalent of defining four named routes And if you mix and match those four named routes with a variety of HTTP request methods, you end up with seven useful very useful permutations
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Calling resources :auctions involves striking a kind of deal with the routing system The system hands you four named routes Between them, these four routes point to seven controller actions, depending on HTTP request method In return, you agree to use very specific names for your controller actions: index, create, show, update, destroy, new, edit It s not a bad bargain, since a lot of work is done for you and the action names you have to use are nicely CRUD-like Table 31 summarizes what happens It s a kind of multiplication table showing you what you get when you cross a given RESTful named route with a given HTTP request method Each box (the nonempty ones, that is) shows you, first, the URL that the route generates and, second, the action that gets called when the route is recognized (The table lists _path methods rather than _url ones, but you get both) (The edit and new actions have unique named routes, and their URLs have a special syntax) Since named routes are now being crossed with HTTP request methods, you ll need to know how to specify the request method when you generate a URL, so that your GET d clients_url and your POST d clients_url don t trigger the same controller
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Table 31 RESTful Routes Table Showing Helpers, Paths, and the Resulting Controller Action Helper Method GET POST PUT DELETE
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action Most of what you have to do in this regard can be summed up in a few rules: 1 The default request method is GET 2 In a form_tag or form_for call, the POST method will be used automatically 3 When you need to (which is going to be mostly with PUT and DELETE operations), you can specify a request method along with the URL generated by the named route An example of needing to specify a DELETE operation is a situation when you want to trigger a destroy action with a link: