gistfile1.coffee

define ["underscore", "backbone" ], (_, Backbone) ->

  FilteredAttributes =
    # Instruct toJSON to use a root node
    rootNode: null
    # Add attribute names to filteredAttributes to exclude them from JSON
    filteredAttributes: []
    # Process our JSON, excluding filteredAttributes, and using
    # rootNode if present
    toJSON: ->
      json = {}
      jsonData = Backbone.Model.prototype.oldToJSON.apply @, arguments
      if @filteredAttributes
        jsonData = _.omit jsonData, @filteredAttributes
      if @rootNode
        json[@rootNode] = jsonData
      else
        json = jsonData
      json

  Backbone.Model.prototype.oldToJSON = Backbone.Model.prototype.toJSON
  _.extend Backbone.Model.prototype, FilteredAttributes

  return