A plugin for Bookshelf that allows getting or setting virtual properties on model instances.
npm install bookshelf-virtuals-plugin 
This is a plugin for the Bookshelf Node.js ORM that allows getting or setting virtual
(computed) properties on model instances.
First install the package:
npm install bookshelf-virtuals-plugin
Then load the plugin using bookshelf.plugin('bookshelf-virtuals-plugin'). Now you are all set to define virtual
properties on your models.
For more information check the online wiki page.