how to get Extjs Store last insert id? -

i use rest proxy, want know last 'id' of last insert record, server side respond should be:

before saving:

id:-1

save:

var values = this.getfrmreciept().getvalues(); var record = this.getfrmreciept().getrecord(); var store  = ext.getstore('recstore'); record.set(values); record.save(); store.add(record); alert(record.data.id);//result '-1' 

respond server:

{"success":true,"reciept":[{"id":"366","c_id":"57","crdt_auth":"test","typ":"2","clerk_id":"1"}]} 

after saving use same record new 'id':

alert(record.data.id);//result '-1' 

how can new 'id' returned server?

thank in advice

var newid = -1;  record.save({     success: function (rec, op) {         newid = rec.getid();         alert(newid);     } }); 

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look fiddle example