(function($) {
   var methodMap = {
     'create': 'POST',
     'update': 'PUT',
     'delete': 'DELETE',
     'read'  : 'GET'
   };
   
   var getUrl = function(object) {
     if (!(object && object.url)) return null;
     return _.isFunction(object.url) ? object.url() : object.url;
   };
   
   var urlError = function() {
     throw new Error("A 'url' property or function must be specified");
   };
 
   Backbone.sync = function(method, model, options) {
     var type = methodMap[method];
 
     // Default JSON-request options.
     var params = _.extend({
       type:         type,
       dataType:     'json',
       beforeSend: function( xhr ) {
         if (!options.noCSRF) {
           var token = $('meta[name="csrf-token"]').attr('content');
           if (token) xhr.setRequestHeader('X-CSRF-Token', token);  
         }
         model.trigger('sync:start');
       }
     }, options);
 
     if (!params.url) {
       params.url = getUrl(model) || urlError();
     }
 
     // Ensure that we have the appropriate request data.
     if (!params.data && model && (method == 'create' || method == 'update')) {
       params.contentType = 'application/json';
 
       var data = {}
 
       if(model.paramRoot) {
         data[model.paramRoot] = model.toJSON();
       } else {
         data = model.toJSON();
       }
 
       params.data = JSON.stringify(data)
     }
 
     // Don't process data on a non-GET request.
     if (params.type !== 'GET') {
       params.processData = false;
     }
 
     // Trigger the sync end event
     var complete = options.complete;
     params.complete = function(jqXHR, textStatus) {
       model.trigger('sync:end');
       if (complete) complete(jqXHR, textStatus);
     };
     
     var success = options.success;
     params.success = function(resp) {
       if (success) success(model, resp, options);
       model.trigger('sync', model, resp, options);
     };
 
     var error = options.error;
     params.error = function(xhr) {
       if (error) error(model, xhr, options);
       model.trigger('error', model, xhr, options);
     };
     
     // Make the request.
     return $.ajax(params);
   }
   
 })(jQuery);