gistfile1.js

$("#taskSortable").children();
       var patchList = [];

       taskList.each(function(){
               var $this = $(this);
               var item = { resource_uri : "/api/task-adventure/"+$this.attr("id")+"/",
                            order : $this.index()}
               patchList.push(item);
       });

       $.ajax({type:"PATCH",
               url:"/api/task-adventure/",
               data: JSON.stringify({objects : patchList}),
               contentType: "application/json",
               success:function(message){
                       alert("Task order updated.");
                       },
               error:function(message){
                             alert(JSON.stringify(message));
                       },
               async:false
               });