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of their plugins. If you don t have a Subversion client installed, you won t be able to install plugins that are distributed directly from Subversion repositories. Yet another good reason to start using Subversion (http://subversion.tigris.org).
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Finding Plugins
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If you want to find a plugin for implementing a specific feature, try a Google search. Usually, you ll get results that will lead you to the web site of an appropriate plugin with instructions on how to install it. If you are not sure exactly what you want, but would like to explore plugins by category, such as Controllers, Models, or Testing, you can access the Rails Plugin Directory at http://agilewebdevelopment.com/plugins. This directory contains an extensive categorized list of plugins. Each plugin has a specific page, which includes a description, some information on how to use it, and a link to the plugin developer s page.
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CHAPTER 10 EXTENDING RAILS WITH PLUGINS
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Another option is to go to the Plugins page in the Rails wiki: http://wiki. rubyonrails.org/rails/pages/Plugins. This page has links to additional resources about plugins and has a huge list of available plugins in a single page. However, the wiki plugin list isn t structured, which sometimes makes it hard to find things. Such is the peril of the anarchic, collaborative nature of the wiki. After you install a plugin, you can usually find instructions on how to use it by reading the README file in the plugin root folder, located at vendor/plugins/#{plugin_name}.
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Installing a plugin is a straightforward affair: just invoke the plugin script with the install command and the name or URL of the plugin you want to install. Plugins are installed in the vendor/plugins directory. Using the name vendor is common in software projects, and generally indicates that the code contained within it is third-party. Let s look at a couple of installation examples. Install a plugin using only its name. This works when the plugin s location is already known to the plugin system via the source option (see Table 10-1).
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$ ./script/plugin install simply_helpful
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+ ./simply_helpful/CHANGELOG + ./simply_helpful/README ... + ./simply_helpful/test/test_helper.rb
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Install a plugin Using a URL. This works for any plugin, and can use either the http(s) or svn protocol.
$ ./script/plugin install svn://rubyforge.org/var/svn/ym4r/Plugins/GM/trunk/ym4r_gm
A /vendor/plugins/ym4r_gm A /vendor/plugins/ym4r_gm/test ... Exported revision 85.
To uninstall a plugin you no longer want to use, just call the remove command:
$ ./script/plugin remove simply_helpful
CHAPTER 10 EXTENDING RAILS WITH PLUGINS
Using a Plugin in Our Application
A particular Rails plugin that is useful in many web applications is acts_as_taggable. This plugin implements tagging giving users the ability to add tags to web content. Tags are relevant keywords that help identify a piece of content. In this section, we ll improve our events application by adding the ability for users to organize the events by tagging them. By installing the acts_as_taggable plugin in our application and using it to manage tagging, we can get this feature up and running in no time.
Note The acts_as_taggable plugin has its own page on the Rails wiki that you can reference:
http://wiki.rubyonrails.com/rails/pages/ActsAsTaggablePluginHowto.
First, use the following command to install the acts_as_taggable plugin in our events application.
$ ./script/plugin install acts_as_taggable
+ + + + + +
./acts_as_taggable/init.rb ./acts_as_taggable/lib/README ./acts_as_taggable/lib/acts_as_taggable.rb ./acts_as_taggable/lib/tag.rb ./acts_as_taggable/lib/tagging.rb ./acts_as_taggable/test/acts_as_taggable_test.rb
Modifying the Database
The plugin is installed, but we still have a bit of work to do before we can begin using it. The first thing we need to do is to create the tables we ll need for tag management. Generate a new migration called AddSupportForTagging.
$ ./script/generate migration AddSupportForTagging
This command will create the db/migrate/008_add_support_for_tagging.rb migration. Open the file and edit it so that it looks like Listing 10-1.
CHAPTER 10 EXTENDING RAILS WITH PLUGINS
Listing 10-1. The db/migrate/008_add_support_for_tagging.rb Migration File
class AddSupportForTagging < ActiveRecord::Migration def self.up create_table :tags do |t| t.column :name, :string end create_table :taggings do |t| t.column :taggable_id, :integer t.column :tag_id, :integer t.column :taggable_type, :string end end def self.down drop_table :tags drop_table :taggings end end
This will create two tables that will be used to save the tags generated by our application. Go ahead and execute the migration file by issuing the Rake command:
$ rake db:migrate
Modifying the Application to Use the Plugin
With the plugin successfully installed and the database tables created, all that s left to do is integrate it into our application. We need to allow users to add tags when they create and edit events. The first step is to configure the Event model to accept tagging. This can be accomplished by adding the acts_as_taggable call to the Event model declaration, as shown in Listing 10-2.
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