MongoDB storing arrays of ObjectId's

Question

In my database I have to store an array of object ids. What should I use? Something like this:

[ObjectId(\"50350e12a36feb1be6000364\"), ObjectId(\"57350e12a37fef         


        

Answer 1

Unless you have a good reason not to, store them as an array of ObjectIds. It's more compact (12 bytes vs. 24) and it more accurately reflects what's stored. It can also enable driver-level support for following ObjectId references.