在集合中插入多个条目

Question

I am attempting to create barcodes that increment by 1 for an entered quantity and add each of them to a MongoDB collection.

I use db.controlNumber.insert({controlNumber}) to do this, and I also use console.log(controlNumber) to see my result. However, in the database, the incremented number will go to the max and enter that many times, where the console.log shows it increment.

while (i < count) {
  i++;

  controlNumber.controlNumber = controlVar[0] + "-" + controlVar[1] + "-" + 
  controlVar[2] + "-" + controlVar[3] + "-000" + i;
  db.controlNumber.insert(controlNumber);
  console.log(controlNumber);     
}

I expect my mongoDB collection to have control number (for example if user wants 5 control numbers)

a-b-c-d-001  
a-b-c-d-002  
...  
a-b-c-d-005

Instead, it makes 5 entries of

a-b-c-d-005

Answer 1

You're mutating controlNumber.controlNumber . Instead, create a new object to insert:

const toInsert = Object.assign({}, controlNumber, { controlNumber: i });
db.controlNumber.insert(toInsert)

It'd likely also be worth either using async/await or promises to handle asynchronous calls. If you do await db.controlNumber.insert(controlNumber) you wouldn't have run into any problems because it would have waited for the document to be fully inserted before moving on to the next one.