Read e-book online Addison-Wesley Professional Ruby Series Rails Plugins: PDF

By Adam J.

Some of the most robust facets of the Rails framework is the power to increase and override it inside your personal functions. this is often completed throughout the Rails plugin mechanism, which supplies an road for Rails builders so as to add robust new gains to their functions and percentage this performance with the global community.This brief lower introduces Rails plugins and considers each one point in their habit and improvement. you will examine what plugins are, how they paintings, and why they are worthwhile. notice 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 keep watch over. eventually, tips on how to proportion your individual plugins.

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Extra info for Addison-Wesley Professional Ruby Series Rails Plugins: Extending Rails Beyond the Core

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Rb file can be used to ensure that some prerequisites of your plugin are in place when the plugin is installed using the script/plugin install command. 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.

Because we have set the template root of this controller, it will then expect all views and partials to be available from this source. If your plugin controller attempts to load a partial or template from the main application, a "Template is missing" message will be displayed. Public Assets When a Rails application starts, usually the only files that can be served by the Web server are those in the public directory; all other files are placed out of bounds. This presents a challenge if you want to include files in your plugins that should be available directly from the Web server, such as JavaScripts or stylesheet assets.

The extend method is an instance method of the Object class (remember, in Ruby everything, including the Class and Module classes, are subclasses of Object). Calling this method will mix in a module in that object instance, adding any methods and constants from the given module. extend(ClassMethods) is that all of the instance methods in the Nickname::ClassMethods module have been added to the Class instance Dude. In this example, 39 40 this adds the nickify method to the Dude class, which is what we were trying to achieve in the first place.

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Addison-Wesley Professional Ruby Series Rails Plugins: Extending Rails Beyond the Core by Adam J.

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