The ObjectId

Now that you have inserted some documents into your MongoDB collections, I want to take a moment to talk about the _id property in the context of MongoDB because it's a little different than the IDs that you're probably used to if you've used other database systems, like Postgres or MySQL.

The _id property in the context of MongoDB

To kick off our discussion of the _id property, let's go ahead and rerun the mongodb-connect file. This is going to insert a new document into the Users collection, like we've defined in the db.collection line. I'm going to go ahead and do that by running the file through the node. It's in the playground folder, and the file itself is called mongodb...