In the previous recipe, we saw how documents can be expired after a fixed time period. However, there can be some cases where we might want to have documents that expire at different times. This is not what we saw in the previous recipe. In this recipe, we will see how we can specify the time at which a document can be expired (it might be different for different documents).
For this recipe, we will create a collection called ttlTest2. We will require a server to be up and running. Refer to the Single node installation of MongoDB recipe in Chapter 1, Installing and Starting the MongoDB Server, to learn how to start the server. Also, start the shell with the TTLData.js script loaded. This script will be available on the book's website for download. To know how to start the shell with a script reloaded, refer to the Connecting to a single node from the Mongo shell with a preloaded JavaScript recipe in Chapter 1, Installing...