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>> a.tags => [#<ActsAsTaggableOn::Tag id: 1, name: "development">, #<ActsAsTaggableOn::Tag id: 2, name: "ruby on rails">, #<ActsAsTaggableOn::Tag id: 3, name: "plugins">] In this code, you assign tags to an existing article. To implement the tagging feature in your application s view, you need to be able to assign tags to existing and new articles. This is a simple matter of adding a tag_list field to the article form partial. Modify the partial in app/views/articles/_form.html.erb to include the tag_list field at the very bottom of the form, as shown in Listing 12-3. Listing 12-3. Adding a Tag Field to the Form in app/views/articles/_form.html.erb: http://gist.github.com/362819 <%= form_for(@article) do |f| %> <% if @article.errors.any %> <div id="errorExplanation"> <h2><%= pluralize(@article.errors.count, "error") %> 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 "Categories" %><br /> <% for category in Category.all %> <%= check_box_tag 'article[category_ids][]', category.id, @article.category_ids.include (category.id), :id => dom_id(category) %> <%= label_tag dom_id(category), category.name, :class => "check_box_label" %> <% end %> </div> <div class="field"> <%= f.label :excerpt %><br /> <%= f.text_field :excerpt %> </div> <div class="field"> <%= f.label :body %><br /> <%= f.text_area :body %>
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</div> <div class="field"> <%= f.label :tag_list %><br /> <%= f.text_field :tag_list %> </div> <div class="field"> <%= f.label :published_at %><br /> <%= f.datetime_select :published_at %> </div> <div class="actions"> <%= submit_or_cancel(f) %> </div> <% end %> You treat the tag_list attribute like a string attribute of your article object. You can do that because acts_as_taggable_on created both the getter tag_list and the setter tag_list= instance methods for you while magically in the background saving tags in their own records and tables. Figure 12-1 shows the result when rendered in a browser.
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Figure 12-1. Added Tag list field in the article form That was a lot of code! Now you can assign tags to articles, but you still need to show those tags in the article page; otherwise, the tags aren t useful. So, open the article partial in app/views/articles/_article.html.erb, and make sure it looks like Listing 12-4.
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Listing 12-4. Showing Tags in the article Partial, app/views/articles/_article.html.erb: http://gist.github.com/362821 <%= div_for article do %> <h3> <%= link_to article.title, article %> <% if article.owned_by current_user %> <span class='actions'> <%= link_to t('general.edit'), edit_article_path(article) %> <%= link_to t('general.delete'), article, :confirm => t('general.are_you_sure'), :method => :delete %> </span> <% end %> </h3> <% if article.tag_list.present %> <small>Tags: <%= article.tag_list %></small> <% end %> <%= simple_format raw(article.body) %> <% end %> That s all there is to it! Just a few minutes after installing the acts_as_taggable_on plug-in, you re finished implementing tagging in your application. As you can see, plug-ins can definitely boost productivity.
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Whenever you find yourself repeatedly writing the same code snippets in different Rails applications, you have a very strong case for extracting this functionality in your own plug-in. Doing so helps you keep the business logic for this functionality in one location instead of in multiple applications and makes it possible to fix bugs in a single place. To demonstrate how to create your own plug-in, in this section you make one to implement simple text-search functionality for a given model so that the search code can be reused easily. This plug-in is called simple_search. Rails comes with a plug-in generator that you can use to create the skeleton for a new plug-in. You just need to tell it the name of the plug-in you want to create: $ rails generate plugin simple_search create create create create create vendor/plugins/simple_search vendor/plugins/simple_search/init.rb vendor/plugins/simple_search/install.rb vendor/plugins/simple_search/MIT-LICENSE vendor/plugins/simple_search/Rakefile
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