Aggregating firestore collectionGroups (e.g. find root document maximum) - PeakU

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Aggregating firestore collectionGroups (e.g. find root document maximum)

I use Firestore JavaScript v9. I have a data structure of items with deeply nested tasks, like this:

item A
- task1
  - task1.1
- task2
item B
- task1
- task2
  - task2.1
    - task2.1.1

Every Task has an endDate Timestamp and a subcollection "subTasks".

How can I query the max / latest endDate of all subTasks within an item?

about 4 years ago · Juan Pablo Isaza

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