Coffescript override Backbone.sync to be Ruby on Rails friendly

gistfile1.coffee

# Override Backbone.sync to be rails friendly
Backbone.sync = ((original) => (method, model, options) ->
  options ?= {}
  
  # Wrap model's attrs in a Rails friendly way by injecting it into options.data
  if not options.data? and model? and (method is "create" or method is "update" or method is "delete")
    unless model.modelName?
      throw new Error "You must specify a modelName in a Rails friendly 
                       underscore format for this model to be persisted" 
    
    options.contentType = 'application/json'
    options.data = id: model.get('id')
    options.data[model.modelName] = model.toJSON()
    delete options.data[model.modelName].id
    options.data = JSON.stringify options.data
  
  original method, model, options
)(Backbone.sync)