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Listing 6-8. Update Action Added to app/controllers/users_controller.rb
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def update @user = User.find(params[:id]) if current_user.update_attributes(params[:user]) flash[:notice] = 'Information updated' redirect_to :action => 'show', :id => @user.id else render :action => 'edit' end end
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The update action looks almost identical to the create action. The main difference is that instead of instantiating a new User object, we re fetching an existing one. We use Active Record s update_attributes method to update all the User attributes with those from the params hash and save it in one shot. If the update fails, update_attributes will return false, and our if statement will take the else path. You can t help but notice that the new and edit templates look essentially the same. Given Rails emphasis on DRY, as you would expect, there s a way to clean this up, and that s what we ll look at next.
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Staying DRY with Partials
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A typical web application is rife with view code and often suffers from a lot of needless duplication. Our HTML forms for adding and modifying users are good examples of forms that are very similar. Wouldn t it be nice if there was a way to reuse the common elements from one form in more than one place That s where partial templates come in. Partial templates, usually referred to as just partials, are similar to regular templates, but they have a more refined set of capabilities. You ll see partials used quite often in a typical Rails application, because they help cut down on duplication and keep the code well organized. Partials follow the naming convention of being prefixed with an underscore, thus distinguishing them from standard templates (which are meant to be rendered on their own. Rather than creating two separate forms, we ll keep our code DRY by using a single partial and include it from both the new and edit templates. First, let s take the form code from new.rhtml and put that code in its own file, as shown in Listing 6-9. We ll call this file _form.rhtml. Notice the leading underscore, which identifies it as a partial.
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CHAPTER 6 ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
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Listing 6-9. The app/views/users/_form.rhtml File
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<%= error_messages_for :user %> <p><label>Login:<br /> <%= text_field :user, :login %></label></p> <p><label>Email:<br /> <%= text_field :user, :email %></label></p> <p><label>Password:<br /> <%= password_field :user, :password %></label></p> <p><label>Password confirmation:<br /> <%= password_field :user, :password_confirmation %></label></p>
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Now we ll revise the template in new.rhtml by including the partial, as shown in Listing 6-10, and do the same for edit.rhtml, as shown in Listing 6-11. Notice that when referencing the partial in the render method, you don t include the leading underscore.
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Listing 6-10. The app/views/users/new.rhtml File
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<h2>User Registration</h2> <% form_tag :action => 'create' do %> <%= render :partial => 'form' %> <p><%= submit_tag 'Sign up!' %></p> <% end %>
Listing 6-11. The app/views/users/edit.rhtml File
<h2>Edit User</h2> <% form_tag :action => 'update' do %> <%= render :partial => 'form' %> <p><%= submit_tag 'Save Changes' %></p> <% end %>
Let s take a closer look at the render method.
<%= render :partial => 'form' %>
CHAPTER 6 ACTION PACK: WORKING WITH THE VIEW AND THE CONTROLLER
A single argument is passed to render in the form of hash. (Are you noticing yet that Rails is a big fan of the options hash ) The symbol :partial is the key, and the partial s name is the value. Upon seeing this, the render method searches the current directory for a file named _form.rhtml. Notice that we don t need to include the leading underscore or the file extension when specifying the partial s name; Rails knows to look for a file in the same directory as the calling template with a leading underscore. Let s take a brief detour here to explain a few things about partials. One of the things that makes partials unique is special convenience: automatic local variable assignment by way of convention over configuration. That was a mouthful. Allow us to explain.
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