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I have to build an app that manages orders between customers who submit the orders and riders who deliver them. Riders work in shifts, so when a customer submits an order, only the riders that are active in that particular shift should recieve a notification.

I chose Firebase as backend for my app, so I'd use cloud firestore, cloud functions, auth and FCM.

My question is: how should I organize my data to achieve what I've mentioned before?

I've already made some options:

  1. I have a collections for shifts, where all riders active in that shift are recorded. When an order is submitted, then i query all the riders active in that shift (queried by time) and then send a notification to each one.
  2. I have a message topic where active riders are subscribed, and then i post the notification there.

Option #1 seems too cumbersome for me. There are a lot of queries to do. Option #2 doesn't need a query at all, but how should i handle riders subscriptions to it (to be more precise, how can active riders in that shift subscribe to the topic) ?

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  • I guess the app is not backed by a proprietary backend. Right? The interaction is app <-> Firebase. Do you track raiders' state? I mean, when they are active and available to pick the next job (delivery)? Commented May 27, 2019 at 10:49
  • Yes, you hit the point. I only interact with firebase. And yes, when a rider picks a job cannot pick another one until he completes the delivery. Commented May 27, 2019 at 11:30
  • Are these shifts always the same? I mean could you create topics per shift? Commented May 27, 2019 at 12:32
  • Well, for each day shift are quite the same. For instance, a day could be split in 4-hours shifts. The problem is that my sakeholders want to be able to customize shifts. In particular, they want that every week, riders have to pre-subscribe to the shifts of the next week, so that they know who is warking in each shift a week before. I don't know if I was clear. Commented May 27, 2019 at 12:47
  • This pre-subscription happens at the end of the current shift? Anytime between the current date and the starting date of the next shift? Commented May 27, 2019 at 13:34

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