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COMMON LAYOUT CONVENTIONS
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A few conventions apply to working with layouts: A layout named application.html.erb is applied automatically unless a more specific candidate exists or is explicitly specified in the controller. A layout that matches the name of a controller is automatically applied if present. Controller-specific layouts take precedence over the application-level layout. You can use the layout directive at the class level in any controller (that is, not inside an action) to set the layout for the entire controller: layout 'my_layout'.
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You can include a layout for a specific action with an explicit call to render inside the action: render :layout => 'my_layout'. Sometimes, you want to render an action without a layout. In that case, you can pass false in place of the layout name: render :layout => false. In practice, you usually use application.html.erb and rarely take advantage of the controller-specific layout functionality. On the occasions when you need to use a different layout for a particular controller, use the layout directive.
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Looking at the Article Form
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Let s look at the new template in action. The new action has a single purpose: to initialize and display the form for creating a new article. The actual creation of a new Article object is the responsibility of the Article model (remember the discussions of the model in s 4 and 5), but it s orchestrated by the controller. Moreover, it needs data (like a title and body), which it must procure from somewhere. The edit action isn t any different, except that it finds and displays a form of an existing article object rather than a new one. You can extract this information from HTML form elements placed in the view and handled in the controller. Open new.html.erb and edit.html.erb, which look like Listings 6-7 and 6-8. Listing 6-7. Content of app/views/articles/new.html.erb <h1>New article</h1> <%= render 'form' %> <%= link_to 'Back', articles_path %> Listing 6-8. Content of app/views/articles/edit.html.erb <h1>Editing article</h1> <%= render 'form' %> <%= link_to 'Show', @article %> | <%= link_to 'Back', articles_path %> Notice the similarity between the templates, especially the render 'form' part highlighted in bold. The render method renders a partial named form in this context. The upcoming section Staying DRY with Partials talks more about partials; for now, let s focus on the content of the template in app/views/articles/_form.html.erb (see Listing 6-9). Listing 6-9. Content of app/views/articles/_form.html.erb <%= form_for(@article) do |f| %> <% if @article.errors.any %> <div id="errorExplanation"> <h2><%= pluralize(@article.errors.count, "error") %>
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prohibited this article from being saved:</h2> <ul> <% @article.errors.full_messages.each do |msg| %> <li><%= msg %></li> <% end %> </ul> </div> <% end %> <div class="field"> <%= f.label :title %><br /> <%= f.text_field :title %> </div> <div class="field"> <%= f.label :location %><br /> <%= f.text_field :location %> </div> <div class="field"> <%= f.label :excerpt %><br /> <%= f.text_field :excerpt %> </div> <div class="field"> <%= f.label :body %><br /> <%= f.text_area :body %> </div> <div class="field"> <%= f.label :published_at %><br /> <%= f.datetime_select :published_at %> </div> <div class="actions"> <%= f.submit %> </div> <% end %> You use form helpers for each of your fields. Visit the article s new page at http://localhost:3000/articles/new in your browser, and you see that the helpers function to produce a nicely formatted HTML form. Use your browser s View Source command to look at the HTML that was generated. Here s part of the generated HTML: <h1>New article</h1>
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<form accept-charset= UTF-8 action="/articles" class="new_article" id="new_article" method="post"> <div style="margin:0;padding:0;display:inline">
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<input name="_snowman" type="hidden" value="☃" /> <input name="authenticity_token" type="hidden" value="Dhqp8NmXwgsAPMVHJPfoRWu8UJN1XurF8ngdzaksC48=" /> </div>
<div class="field"> <label for="article_title">Title</label><br /> <input id="article_title" name="article[title]" size="30" type="text" /> </div> <div class="field"> <label for="article_location">Location</label><br /> <input id="article_location" name="article[location]" size="30" type="text" /> </div> <div class="field"> <label for="article_excerpt">Excerpt</label><br /> <input id="article_excerpt" name="article[excerpt]" size="30" type="text" /> </div> <div class="field"> <label for="article_body">Body</label><br /> <textarea cols="40" id="article_body" name="article[body]" rows="20"></textarea> </div> <div class="actions">
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