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

By Adam J.

Essentially the most strong elements of the Rails framework is the power to increase and override it inside your personal purposes. this can be accomplished in the course of the Rails plugin mechanism, which supplies an road for Rails builders so as to add robust new good points to their purposes and proportion this performance with the global community.This brief reduce introduces Rails plugins and considers every one point in their habit and improvement. you are going to study what plugins are, how they paintings, and why they are priceless. observe how to define and set up plugins utilizing the supplied script, then discover the realm of plugin improvement, together with universal plugin idioms, checking out, and model keep an eye on. eventually, percentage your personal plugins.

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Each time the object is saved, a checksum of the model's attributes is stored in the model itself. You can use this to check that nothing outside of your Rails application has tainted the database (yes, this is paranoid, but it makes for a good example). Before starting to implement this plugin, it is again worth thinking about how you want to use this plugin once it's finished. 8 shows how your finished plugin will be used in a running Rails application. 8. The finished simple checksum plugin in use class Thing < ActiveRecord::Base has_many :other_things acts_as_checksummed #our new behavior-specifying method # the rest of the model code...

4), when the store_breadcrumbs method is encountered in the class definition, its implementation in the ClassMethods module is run. This results in a before_filter being added to the controller, which will call the drop_breadcrumb method before each request. To summarize, this example presents a simple mechanism you can use to abstract common method definitions and class features into a plugin. It also shows how to make those features available to classes by including a single class method "macro" in the class definition.

2. rb, users of your plugin are not required to add anything to their applications in order to use the new functionality. This method of adding functionality to existing Rails classes is one of the key tools for a plugin developer. rb files in currently available plugins will show similar lines for injecting functionality into ActiveRecord, TestUnit, and many other Ruby libraries. 30 31 Summary You've now seen the second key facet of a pluginthe lib directory in your plugin. This directory is added to Ruby's load path (which can be interrogated from the console via the $LOAD_PATH global variable), allowing Rails to find the classes, modules, and methods that your plugin carries as its payload.

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

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