gistfile1.md

I love coffescript's null soakage ? operator, but I recently started using Backbone.Model's @has (http://backbonejs.org/#Model-has, http://backbonejs.org/docs/backbone.html#section-37) when determining if an attribute is set. The JavaScript result is much more DRY since it uses a single Backbone method instead of duplicating the logic, you also save a var...

@get('attachments')?.length > 0 

becomes

var _ref; 
((_ref = this.get('attachments')) != null ? _ref.length : void 0) > 0; 

While you need more coffee script for @has,

(@has('attachments') and @get('attachments').length > 0) 

the js is a little lighter

this.has('attachments') && this.get('attachments').length > 0;