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

By Adam J.

Probably the most strong points of the Rails framework is the facility to increase and override it inside your personal purposes. this is often accomplished throughout the Rails plugin mechanism, which gives an road for Rails builders so as to add robust new beneficial properties to their functions and percentage this performance with the global community.This brief minimize introduces Rails plugins and considers each one element in their habit and improvement. you will examine what plugins are, how they paintings, and why they are invaluable. detect how to define and set up plugins utilizing the supplied script, then discover the area of plugin improvement, together with universal plugin idioms, trying out, and model regulate. eventually, how one can proportion your individual plugins.

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1 to add a class method to any class that includes the Nickname module. In this example, the Nickname module is given two methods. nickify, a class method that you want to be added to any class that includes the Nickname module However, as can be seen from the following error message, this hasn't happened. nickname NoMethodError: undefined method 'nickify' for Dude:Class from (irb):3 in 'nickname' So, let's figure out what is going on here. 1 created two methods in the Nickname module. The first methodnicknameappears as you would expect in the class which includes the module.

Its purpose is exactly the same as its counterpart in a normal plugin. It is named differently so that the engines plugin itself can control which engines are loaded, and in which order. start :reporting, :job_queue, :data_processor Code Mixing Another useful feature that the engines plugin has is the ability to selectively override small parts of an engine in the application. If the layout of a particular view or partial doesn't suit the current application, a replacement can be created in the application that overrides the view or partial contained in the engine.

An engine is basically the same as a plugin; it contains lib, tasks, and test directories along with a README file. Engines will also commonly contain the app directory structure described in the previous section. This section covers some of the notable differences between engines and plugins. 51 52 Developing with Engines To use engines in your application, you must first install the engines plugin. This plugin enhances the Rails framework and allows controllers, models, and views (and almost any other kind of file you could see in a Rails application) to be automatically loaded from engines.

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