By Adam J.
Some of the most robust features of the Rails framework is the power to increase and override it inside your individual functions. this can be accomplished throughout the Rails plugin mechanism, which gives an road for Rails builders so as to add strong new good points to their purposes and proportion this performance with the global community.This brief minimize introduces Rails plugins and considers every one element in their habit and improvement. you are going to study what plugins are, how they paintings, and why they're precious. observe 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 regulate. eventually, how one can proportion your individual plugins.
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Additional resources for Addison-Wesley Professional Ruby Series Rails Plugins: Extending Rails Beyond the Core
Included is passed the class Dude as the argument base_class. extend with another module (a submodule of Nickname called ClassMethods, in this case) as the argument. 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.
Rb A trivial technique for making any plugin file available to the Web server is to simply copy these files into the application's own public directory. rb file, so the files will be copied as soon as the plugin is installed. 1 shows how to achieve this. This code snippet assumes that your files will be stored in a directory in the plugin called assets, and in subdirectories therein mirroring the corresponding subdirectories in the main application's public folder. 1. rb An alternative to this approach is to have the files copied each time the server starts.
Using Symbolic Links You may be tempted to simply create symbolic links from the main public directory into the assets (or equivalent) folder of your plugin. This technique can be easy for users comfortable dealing with the file system at this level, but it also raises a number of issues. • Creating any symbolic links outside of the public directory may inadvertently expose areas of your server's file system to the Web if the link is not created correctly. In a worst-case scenario, you could allow malicious users access to sensitive information, including passwords and server configuration details.