I Always get the same group about mapswipe HOT 6 CLOSED

Here's an idea: download N groups to the app, and randomly select one of them to actually use. The data to download isn't more than a couple hundred bytes * N, which should be negligible compared to the volume of imagery.

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Hey,
I like that idea. It seems to reduce the chance of getting the same group again. I discussed with @Matthias-Schaub another potential option here: mapswipe/python-mapswipe-workers#134

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The advantage of this is that it's 2 lines of code. I had a look at your other proposed solutions, which seem more complicated in terms of code to write. Given that there is a limited number of groups to choose from, I think there will always be a (number of groups / numbers of concurrent users) situation where two users get the same group at the same time, or a user sees the same group twice. Any of our proposed solutions will only reduce the likelihood of it. So I'd go for easy to implement :)

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Hey,
sounds perfect. Let's go for the simple 2-line solution.
Download a limited number of groups. (Maybe it's even enough to download just the group keys. But that's up to you.) Then select one group randomly to work on. 👍

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and maybe just one additional question:

• How much effort is it to check the downloaded groups and the groups a users has already finished?

The finished groups should be available from the user profile. A strategy on the app side could be

1. to download 15 groups from firebase
2. remove the groups a user has already worked on (based on user profile)
3. randomly select one of the remaining groups

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I've implemented your suggestion above, and it seems to work ok. There will be an edge case where a user has worked on all 15 groups that have the highest requiredCount, which would result in no groups left to work on at a given point in time. While this is theoretically possible, I think the practical risk of this happening is pretty low, so I'd go with it anyway. Maybe you could check what the highest number of groups a single user has mapped in one project is, which would give us a clue as to how likely that case is to happen, but I don't think it's a high priority :)

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