Simple [incomplete] node.js example of using MongoDB change streams for monitoring flight inventory in real-time as it changes in the database.

This only handles the following cases, for 1 seat

• Finding initial flights available
• Showing flights added (inserted)
• Showing any inventory made available for the initial flight results
• Noting a flight needs to be deleted if any initial flights get full

To start a mongod, you can create a directory for the data such as /data and then use this command

mongod --replSet "rs0" --dbpath=/data

More details on: running MongoDB in a replica set

It uses a few example documents in the dump directory, which you can import with a command like

cd watch-flights
mongorestore

1. Run create script

sh scripts/start-replica.sh

This will launch mongod running on localhost ports 27018, 27019, and 27020.

2. Run replica init script

sh scripts/create-replica.sh

This will connect to one instance running locally and initialize the replica set watchflights.

If you need to stop the replica set for any reason, use the following:

sh scripts/stop-replica.sh