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

By Adam J.

The most robust facets of the Rails framework is the power to increase and override it inside your personal purposes. this is often completed during the Rails plugin mechanism, which supplies an street for Rails builders so as to add strong new beneficial properties to their purposes and proportion this performance with the global community.This brief lower introduces Rails plugins and considers each one element in their habit and improvement. you are going to examine what plugins are, how they paintings, and why they are helpful. become aware of 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 an eye on. ultimately, the right way to percentage your personal plugins.

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Sharing Files That Aren't Code We've seen that plugins can include most of the types of Ruby code files that can be found in Rails applications, including: 49 50 • models • helpers • controllers • modules (for mixing in functionality to any of the above) However, it is often useful to share files that aren't Ruby source code between applications. Examples of this include stylesheets, shared images (such as the ubiquitous animated spinner image, which indicates that some fantastic Ajax action is underway), JavaScript files, and possibly most importantly, Rails views and partials.

5). 5. get? uniq! end end 41 42 Making the method private will ensure that it can't be called accidentally as a controller action from the dispatcher. 6. 6. send :include, Breadcrumbs All that remains is to implement the store_breadcrumbs method for use in the application controllers. 4, is to be able to add the breadcrumb-storing behavior to any controller with the single line store_breadcrumbs in the controller class definition. To achieve this, you need to define the store_breadcrumbs method and make it available as a class method to all application controllers.

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. 4). 4. yml (Edge Rails Only) Another upcoming feature in Edge Rails is the info command (introduced in Section 2), which gives users summary information about plugins before they are installed.

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