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link_to "Delete", auction_path(auction), :method => :delete
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Depending on the helper method you re using (as in the case of form_for), you might have to put the method inside a nested hash:
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form_for "auction", :url => auction_path(auction), :html => { :method => :put } do |f|
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That last example, which combined the singular named route with the PUT method, will result in a call to the update action when submitting the form (as per row 2, column 4 of Table 31) You don t normally have to program this functionality specifically, because as we ll see later in the book, Rails automatically figures out whether you need a POST or PUT if you pass an object to form helpers
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351 Singular and Plural RESTful Routes
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As you may have noticed, some of the RESTful routes are singular; some are plural The logic is as follows: 1 The routes for show, new, edit, and destroy are singular, because they re working on a particular resource 2 The rest of the routes are plural They deal with collections of related resources
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35 The Standard RESTful Controller Actions
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The singular RESTful routes require an argument, because they need to be able to figure out the id of the member of the collection referenced
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item_url(item) # show, update, or destroy, depending on HTTP verb
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You don t have to call the id method on item Rails will figure it out (by calling to_param on the object passed to it)
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352 The Special Pairs: new/create and edit/update
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As Table 31 shows, new and edit obey somewhat special RESTful naming conventions The reason for this has to do with create and update, and how new and edit relate to them Typically, create and update operations involve submitting a form That means that they really involve two actions two requests each: 1 The action that results in the display of the form 2 The action that processes the form input when the form is submitted The way this plays out with RESTful routing is that the create action is closely associated with a preliminary new action, and update is associated with edit These two actions, new and edit, are really assistant actions: All they re supposed to do is show the user a form, as part of the process of creating or updating a resource Fitting these special two-part scenarios into the landscape of resources is a little tricky A form for editing a resource is not, itself, really a resource It s more like a pre-resource A form for creating a new resource is sort of a resource, if you assume that being new that is, nonexistent is something that a resource can do, and still be a resource! That line of reasoning might be a little too philosophical to be useful The bottom line, as implemented in RESTful Rails, is the following: The new action is understood to be giving you a new, single (as opposed to plural) resource However, since the logical verb for this transaction is GET, and GETting a single resource is already spoken for by the show action, new needs a named route of its own That s why you have to use
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link_to "Create a new item", new_item_path
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REST
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to get a link to the items/new action The edit action is understood not to be giving you a full-fledged resource, exactly, but rather a kind of edit flavor of the show resource So it uses the same URL as show, but with a kind of modifier, in the form of /edit, hanging off the end, which is consistent
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3: REST, Resources, and Rails
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with the URL form for new:
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/items/5/edit
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The corresponding named route is edit_item_url(@item) As with new, the named route for edit involves an extra bit of name information, to differentiate it from the implied show of the existing RESTful route for GETting a single resource
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353 The PUT and DELETE Cheat
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We have just seen how Rails routes PUT and DELETE requests Some HTTP clients are able to use said verbs, but forms in web browsers can t be submitted using anything other than a POST Rails provides a hack that is nothing to worry about, other than being aware of what s going on A PUT or DELETE request originating in a browser, in the context of REST in Rails, is actually a POST request with a hidden field called _method set to either "put" or "delete" The Rails application processing the request will pick up on this, and route the request appropriately to the update or destroy action You might say, then, that the REST support in Rails is ahead of its time REST components using HTTP should understand all of the request methods They don t, so Rails forces the issue As a developer trying to get the hang of how the named routes map to action names, you don t have to worry about this little cheat And hopefully some day it won t be necessary any more (HTML5 in particular adds PUT and DELETE as valid method attributes for forms)