mongoose - Receiving "TypeError: Object #<EventEmitter> has no methods 'updateMyField'" in a post-save hook -

this relevant part of code think i'm getting error in - says

"if (this.ended && !this.hasrejectlisteners()) throw reason;

typeerror: object # has no methods 'updatemyfield'"

fieldschema   .post('save', function () {     var self = this;     self.updatemyfield();   });  fieldschema.methods = {     updatemyfield: function() {     var deferred = q.defer();     // things here     return deferred.promise;   } }; 

i'm pretty confused why claims there's no method - love kind of give!

the issue post hooks require use doc access object, explained , answered in why "this" keyword different in mongoose pre-save hook versus post-save hook?.