protective protects active records from being destroyed in a declarative way: < protect_if :attachments, "Record has attachments and cannot be destroyed" > . Of course, you may pass the name of any defined method. If its result evaluates to present?, the record is not going to be destroyed. No exception is thrown, but a message is added to the errors object of your model. This may then be used further on.
p4delta works with a project that is in the Perforce configuration management system. It lists the local files that have been added, changed, or deleted. Content differences are summarized, i.e., the number of lines of code that have been added, changed, and deleted. It can also add, edit, and remove the appropriate files to/from Perforce.
GetYourIDX Ruby Library is a library that implements the GetYourIDX API in Ruby. GetYourIDX provides IDX data services to real estate agents and brokers. IDX technology gives participants in multiple listing services (MLS) the essential tools needed to display each others' clients on their prospective Internet sites. Under the IDX real estate system, brokers agree to display each others listings on the Internet and are provided the option of what listings they want displayed.
Advertnet is tool for managing multiple networks of advertising boards, ready to work with Second Life. In Advertnet's model, the boards are attached to urban furnitures and can belong to different networks, thus forming ad campaigns. Differents types of objects can be attached to boards and networks: notecards, URLs, etc. Advertnet is composed of a Ruby on Rails application that can communicate with ad boards created in Second Life.