Backbone playing with Dnode

backbone_dnode.coffee

  # Load the remote RB db object, our connection to the backend SQLite or MongoDB
  DNode.connect (rbdb) ->
    RB.db = rbdb
    # Fetch the logged in Backbone user if any
    RB.user.fetch success: -> Backbone.history.loadUrl()

  # Overwrite the Backbone sync method to use Dnode and rbdb
  # The Recordbook database has a MongoDB compatible API, even if it sits on SQLite
  Backbone.sync = (method, model, success, error) ->
    collectionName = model.collectionName()
    # Backbone Models have a "hasChanged" function, distinguishing them from Collections
    isCollection = if model.hasChanged? then false else true

    # A generic response handler using Node style callbacks to invoke Backbone success/error handlers
    handleResponse = (err, obj) ->
      if err? then return error(err)
      return success(obj)

    switch method
      when "create"
        RB.db.insert collectionName, model.attributes().toJSON(), handleResponse
      when "read"
        findFunct = if isCollection then RB.db.find else RB.db.findOne
        findFunct.call RB.db, collectionName, {}, handleResponse