javascript - Increment field on all records in Mongo? -

the error being thrown in angular itemcontroller, error: typeerror: path must string

$scope.createproduct = function() {          // validate formdata (using our exentions.js .filter) make sure there         //if form empty, nothing happen         if (!isemptyobjectfilter($scope.formdata)) {                  // call create function our service (returns promise object)                 emotions.create($scope.formdata)                          // if successful creation, call our function new emotions                         .success(function(data) {                                 $scope.formdata = {}; // clear form our user ready enter                                 $scope.products = data; // assign our new list of emotions                         })                         .error(function(data) {                                 console.log('error: ' + data);                         });         } }; 

adding else if, moving every record down when new position matches existing position, leads 500 internal server error..

 } else if(typeof doc.position == "number") {      console.log('yes, number');      // check if there existing document same position     // use mongoose.model fetch model because model not compiled yet     mongoose.model("product").where({_id: {$ne: doc._id}, position: doc.position}).count( function (err, count) {          // if there error, pass next()         if(err)             return next(err);          // if there doc same position, execute update move down $gte docs         if(count > 0) {             // use mongoose.model fetch model because model not compiled yet             mongoose.model("product").update({position: {$gte: doc.position}}, {position: {$inc: 1}}, {multi: 1}, function(err, numaffected) {                  console.log(numaffected);                  // call next() (with or without error)                 next(err);             });          } else {             //  there no docs need move down, call next()             next();         }     }); 

i have field 'position' on mongoose doc, sorting results via frontend angular loop.

var productschema = mongoose.schema({     title : string,     position: number }); 

the schema auto-incrementing 'if' statement, new documents without 'position' entered..

// before validation starts, number of products counted // afterwards, position set productschema.pre("validate", function(next) {      var doc = this;      // if 'position' not filled in, fill in     // not using !position because 0 might valid value     if(typeof doc.position !== "number") {         // count number of products *         // use mongoose.model fetch model..because it's not compiled yet         mongoose.model("product").count(function(err, num) {             // if there error, pass next()             if(err)                 return next(err);              // set position, call next();             doc.position = num;             return next();         }); 

..and schema otherwise storing doc because of 'else' statement, new documents manually-entered form-field 'position'.

    } else {         //  there no need count or update positions, call next()         next();     } });  module.exports = mongoose.model('product', productschema); 

frontend: input type="number" class="form-control" placeholder="0" ng-model="formdata.position"