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Listing 10-8. The app/views/events/_search.rhtml File
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<h2><%= link_to_function "Find an event", "Element.toggle('search')" %></h2> <div id="search" <%= 'style="display: none"' unless request.post %>> <% form_tag :action => 'search' do -%> <p>Title:<br /> <%= text_field_tag 'title', params[:title], :size => 30 %></p> <p>Location:<br /> <%= text_field_tag 'location', params[:location], :size => 30 %></p> <p><%= submit_tag 'Search!' %></p> <% end -%> </div>
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Now let s modify the index template in app/views/events/index.rhtml template so that it loads the search partial we just created. The updated index template is shown in Listing 10-9.
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Listing 10-9. Updates to app/views/events/index.rhtml
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<h1><%= link_to "All Events", events_url %></h1> <%= render :partial => 'search' %> <%= render :partial => 'event', :collection => @events %> <%= link_to 'Previous page', { :page => @event_pages.current.previous } if @event_pages.current.previous %> <%= link_to 'Next page', { :page => @event_pages.current.next } if @event_pages.current.next %>
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That s all there is to it. Restart your web server and try performing a search. You should see something like the results in Figure 10-2.
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CHAPTER 10 EXTENDING RAILS WITH PLUGINS
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Figure 10-2. Search functionality added to our events application
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You ll now be able to use the simply_searchable plugin in other applications whenever you need simple search functionality. And you ll be able to come back to it for reference when you re building more plugins in the future.
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WHEN SHOULD YOU USE A PLUGIN
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You will find that there are hundreds of plugins available for Rails developers, and you might want to try a few in your applications. However, in some cases, plugins might not work to your advantage, and might even slow you down. There s no magic formula for knowing when to use a plugin or when to write your own code, but we ll try to give you a few tips to help you decide whether or not you should go for a plugin. If the functionality you need to create is very common and your implementation has nothing very specific, you can assume that using a plugin will be safe and will save you some time. Examples of this type of common functionality are tagging, allowing users to post comments, using external applications like Google Maps, or using a specific API. If you are implementing a common feature that has a very specific design in your application, you might still save some time by using a plugin if you feel comfortable adapting the plugin code to your
CHAPTER 10 EXTENDING RAILS WITH PLUGINS
own needs. This depends not only on your situation, but also on how the plugin has been written. Usually, it s not too complicated to adapt a plugin to suit your needs. If you re implementing a feature that is very unique to your application, it s probably a wise move to code the feature directly into the code base of your application. This applies especially if the implementation depends on other parts of your code, such as an authorization and authentication system. If this specific feature is to be shared with other applications under your control, then you might want to extract the functionality into its own plugin to make the code easy to share among applications.
Summary
In this chapter, you learned about the strengths of Rails plugin system. We demonstrated how to install and use a plugin, which usually takes only a few minutes. We also showed you how to create your own plugins. By creating plugins, you make your application focus more on it business logic, and move code to reusable units outside the scope of your application. You should take the time to read the code of the plugins you end up using in your applications. By reviewing the code behind a plugin, you will likely learn some new tricks, and you will understand how the new methods your code inherited have been implemented. You might even be able to help the development of a plugin by spotting a bug or a better/faster implementation for a specific feature or method.
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