Download Addison-Wesley Professional Ruby Series Rails Plugins: by Adam J. PDF

By Adam J.

Probably the most robust features of the Rails framework is the power to increase and override it inside of your personal purposes. this can be completed during the Rails plugin mechanism, which gives an road for Rails builders so as to add strong new positive factors to their functions and proportion this performance with the global community.This brief reduce introduces Rails plugins and considers every one element in their habit and improvement. you are going to examine what plugins are, how they paintings, and why they're invaluable. detect how to define and set up plugins utilizing the supplied script, then discover the realm of plugin improvement, together with universal plugin idioms, trying out, and model keep watch over. ultimately, tips on how to percentage your individual plugins.

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Any files and directories stored under the public directory in an engine are automatically mirrored into discrete subfolders in the application's public folder. To use these files in layouts and views, the engines plugin provides several helper methods to load stylesheets, JavaScripts, and images easily. 2 shows some of these helpers in use in an application layout. 2. Using engine helpers in a simple application layout <%= engine_stylesheet 'reporting', 'query' %> <%= engine_javascript 'reporting' %> 52 53

You can even see this new task listed in the output of rake T: $ cd /Users/james/Code/my_app $ rake -T <... log files in log/ to zero bytes rake my_plugin:cleanup # Clear out the temporary files rake rails:freeze:edge # Lock to latest Edge Rails or a specific... <... > The use of namespaces helps gather related tasks together and avoids collisions with rake tasks from other sources (such as Rails itself). org). 1 outlines the three built-in Rake tasks Rails provides for use with plugins to generate documentation and run any packaged tests in plugins (testing plugins is the subject of Section 8).

For example, you may develop a plugin that generates intermediate data stored as temporary files in an application. 2). 2. rb file, the directory tmp/my_plugin_data will be created in any Rails application in which the plugin is installed. This fire-once action can be used for any 32 33 number of purposes, including but not limited to the following. 3. rb when removing a plugin. If this file is present, it will be evaluated just prior to the plugin files actually being deleted. Typically, this is useful for reversing any actions performed when the plugin was installed.

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