REST in Java

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REST
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3114 New and Create
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As you ve already seen, the new and create actions go together in RESTful Rails A new resource is really just an entity waiting to be created Accordingly, the new action customarily presents a form, and create creates a new record, based on the form input Let s say you want a user to be able to create (that is, start) an auction You re going to need 1 A new action, which will display a form 2 A create action, which will create a new Auction object based on the form input, and proceed to a view (show action) of that auction The new action doesn t have to do much In fact, it has to do nothing Like any empty action, it can even be left out Rails will still figure out which view to render However, your controller will need an auction helper method, like
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protected def auction @auction ||= current_userauctionsbuild(params[:auction]) end helper_method :auction
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If this technique is alien to you, don t worry We ll describe it in detail in Section 1015
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3: REST, Resources, and Rails
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A simplistic newhtmlhaml template might look like Listing 32
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Listing 32 A New Auction Form %h1 Create a new auction = form_for auction do |f| = flabel :subject = ftext_field :subject %br = flabel :description = ftext_field :description %br = flabel :reserve = ftext_field :reserve %br = flabel :starting_bid = ftext_field :starting_bid %br = flabel :end_time = fdatetime_select :end_time %br = fsubmit "Create"
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Once the information is filled out by a user, it s time for the main event: the create action Unlike new, this action has something to do
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def create if auctionsave redirect_to auction_url(auction), :notice => "Auction created!" else render :action => "new" end end
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3115 Edit and Update
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Like new and create, the edit and update actions go together: edit provides a form, and update processes the form input The form for editing a record appears similar to the form for creating one (In fact, you can put much of it in a partial template and use it for both; that s left as an exercise for the reader) The form_for method is smart enough to check whether the object you pass to it has been persisted or not If it has, then it recognizes that you are doing an edit and specifies a PUT method on the form
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312 Conclusion
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312 Conclusion
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In this chapter, we tackled the tough subject of using REST principles to guide the design of our Rails applications, mainly as they apply to the routing system and controller actions We learned how the foundation of RESTful Rails is the resources method in your routes file and how to use the numerous options available to make sure that you can structure your application exactly how it needs to be structured By necessity, we ve already introduced many controller-related topics and code examples in our tour of the routing and REST features In the next chapter, we ll cover controller concepts and the Action Controller API in depth
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REST
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C HAPTER 4
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Working with Controllers
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Controllers
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Remove all business logic from your controllers and put it in the model (My) instructions are precise, but following them requires intuition and subtle reasoning Nick Kallen
Like any computer program, your Rails application involves the flow of control from one part of your code to another The flow of program control gets pretty complex with Rails applications There are many bits and pieces in the framework, many of which execute each other And part of the framework s job is to figure out, on the fly, what your application files are called and what s in them, which of course varies from one application to another The heart of it all, though, is pretty easy to identify: It s the controller When someone connects to your application, what they re basically doing is asking the application to execute a controller action Sure, there are many different flavors of how this can happen and edge cases where it doesn t exactly happen at all But if you know how controllers fit into the application life cycle, you can anchor everything else around that knowledge That s why we re covering controllers before the rest of the Rails APIs Controllers are the C in MVC They re the first port of call, after the dispatcher, for the incoming request They re in charge of the flow of the program: They gather information and make it available to the views Controllers are also very closely linked to views, more closely than they re linked to models It s possible to write the entire model layer of an application before you create a single controller, or to have different people working on the controller and model layers who never meet or talk to each other However, views and controllers are more tightly coupled to one another They share a lot of information, and the names you choose for your variables in the controller will have an effect on what you do in the view