node.js - Using a value of an document as _id when importing this document to MongoDB using NodeJS -

i'm trying import object mongo. when try use value of object _id fails. error i.e: "[casterror: cast objectid failed value "11563195" @ path "_id"]" , later "[error: document must have _id before saving]"

what doing wrong ?

// read , import csv file.     csv.frompath(filepath, {         objectmode: true,         headers: keys     })     .on('data', function (data) {          settimeout(function(){              var obj = new models[filename](data);             obj._id = obj.some_id;              obj.save(function (err, importedobj) {                  if (err) {                      console.log(err);                  } else {                      console.log('import: ok');                  }             });          }, 500);     }) 

here used schema:

    var mongoose = require('mongoose');     var schema = mongoose.schema;      var someschema = new schema(         {             some_id: string,             field01: string,             field02: string,             field03: string,             field04: string,             field05: string,             field06: string,             field07: string,             field08: string,             field09: string,             field10: string,             field11: string,             field12: string,             field13: string         },         {             collection: 'somecollection'         });  module.exports = mongoose.model('somecollection', someschema); 

many time , help.

by default mongoose validating _id field mongoid. if want store other mongoid in _id field need give _id field different type.

var someschema = new schema({     _id: { type: string, required: true } }