is there a way to prevent others from changing data in a row in mongodb

Question

I'm designing an application using mongodb and python and I need some way to read a row then based on its contents update it but I don't know of a way to make sure than another process isn't accessing that row also. My searched for 'locking a row in mongodb' don't return anything useful.

I'm currently accessing the data using:

row = db.table.find_one({'_id' : id})
if row['value'] > 10:
    db.table.save(update_row(row))

But I worry that between row being created and the updated record being saved the data could have been accessed.

What sort of design pattern should i be using

Answer 1

Here is JavaScript Code to update the document only if it is original as initially read. Sorry I'm not good with python but you could use this code as a starting point.