javascript - Backbone.sync scope issues -

i'm using backbone.sync send collection php function, stores information in database , returns data based on his.

everything works until success function of .sync(), lose scope of model , collection can't update them, there way around this?

i've tried using 2 methods , neither seem return anything, , can't find more information on subject on here or google. it's in preferences avoid using model.save(), it's many calls backend.

method 1 ;

var that=this; // logic done here backbone.sync("update",this.collection,{     success:function(data){         // attempt update this.collection here, `that` out of scope         // , scope of `this` different      } }); 

method 2 :

var that=this; var ondatahandler=function(data){     // attempt update this.collection here, `that` out of scope     // , scope of `this` different  }; // logic done here backbone.sync("update",this.collection,{     success:ondatahandler }); 

does know way around problem? checked backbone documentation , noticed collection.fetch() function delegates .sync(), , yet 2nd method 1 use .fetch() , works fine in keeping scope of that

try:

var that=this; var prebindhandler=function(data){     // attempt update this.collection here, `that` out of scope     // , scope of `this` different  }; successhandler = prebindhandler.bind(this); // logic done here backbone.sync("update",this.collection,{     success:successhandler }); 

further reading on .bind