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A partial is a fragment of template code The Rails way is to use partials to factor view code into modular chunks that can be assembled in layouts with as little repetition as possible In older versions of Rails, the syntax for including a partial within a template started with render :partial, but now passing a string to render within your view will get interpreted to mean you want to render a partial Partial template names must begin with an underscore, which serves to set them apart visually within a given view template directory However, you leave the underscore out when you refer to them
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%h1 Details = render 'details'
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The simplest partial use case is simply to extract a portion of template code Some developers divide their templates into logical parts by using partial extraction Sometimes it is easier to understand the structure of a screen if the significant parts are factored out of it For instance, Listing 104 is a simple user registration screen that has its parts factored out into partials
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Listing 104 Simple user registration form with partials %h1 User Registration = error_messages_for :user = form_for :user, :url => users_path do registration detailsdemographics = render 'details' = render 'demographics' location = render 'location' opt_in = render 'opt_in' terms = render 'terms' %p= submit_tag 'Register'
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While we re at it, let me pop open one of those partials To conserve space, we ll take a look at one of the smaller ones, the partial containing the opt-in check boxes of this particular app The source is in Listing 105; notice that its name begins with an underscore
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Listing 105 The opt-in partial in the file app/views/users/_opt_inhtmlhaml %fieldset#opt_in %legend Spam Opt In %p = check_box :user, :send_event_updates Send me updates about events! %br = check_box :user, :send_site_updates Notify me about new services
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Personally, I like partials to be entirely contained inside a semantically significant markup container In the case of the opt-in partial in Listing 105, both check box controls are contained inside a single fieldset element, which I ve given an id attribute Following that rule, more as a loose guideline than anything else, helps me to mentally identify how the contents of this partial are going to fit inside the parent template If we were dealing with other markup, perhaps outside of a form, I might choose to wrap the partial markup inside a well-identified div container, instead of a fieldset Why not include the td markup inside the partial templates It s a matter of style I like to be able to see the complete markup skeleton in one piece In this case, the skeleton is the table structure that you see in Listing 104 If portions of that table were inside the partial templates, it would obfuscate the layout of the page I do admit that this is one of those areas where personal style and preference should take precedence and I can only advise you as to what has worked for me, personally
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Since the registration form is neatly factored out into its component parts, it is easy to create a simple edit form using some of its partials, as in Listing 106
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Listing 106 Simple user edit form reusing some of the same partials %h1 Edit User = form_for :user, :url => user_path(@user), :html => {:method => :put} do settings details
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= render :partial => 'details' demographics = render :partial => 'demographics' opt_in = render :partial => 'opt_in' %p= submit_tag 'Save Settings'
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If you compare Listings 104 and 106, you ll notice that the structure of the table changed a little bit in the Edit form, and it has less content than the registration form Perhaps the location is handled in greater detail on another screen, and certainly you don t want to require agreement of terms every time the user changes her settings
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