Using for loop and forEach to extract html from website for JSON array of objects.remove item from nested array using $pull.Deleting a single item from an array using mongoose.Req.body not fetching array value from schema when save data using node.How to search for records by using a value in object array from mongoose?.So, even if you execute this query twice, on the same time, on the same object, you would end up with friendsTotal = 2, because MongoDB use these update operators to better handle parallelism, data locking and more. Folllowing your example, if two requests are made at the same time on the same object, passing. When you execute this multiple times, MongoDB will take care of the parallelism for you.
This is ok when you don't need to worry about parallelism or multiple queries to the same object.įindByIdAndUpdate is atomic. The main difference is that when you use findById and save, you first get the object from MongoDB and then update whatever you want to and then save.
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