detect when a Grandchild is added, very large dataset.

[Jason Rahaim]

We have an endpoint with 150,000 children. (each one has 10-100 grand children). 

I am trying to detect when a child is added (easy enough) OR when a Grandchild is added. I don't, at the moment, care about the current data set, I only want to monitor for additions to it.

[firebaseRef observeEventType:FEventTypeChildAdded

Doesn't work since it didn't detect grand children being added. 

I tried: [[firebaseRef queryLimitedToLast:30] observeEventType:FEventTypeValue]

Which detects the changes, and returns the type of data I want, but it returns the same 30 children when ever anything changes even if they are not one of the ones that changes.

-Jason

[Jacob Wenger]

Hey Jason,

To detect changes in grandchildren, you will either need to add a child_added listener at a deeper path or use a value event for each grandparent. With that many nodes, the former (using child_added) is probably your best bet. In general, adding new listeners is super cheap. Things get expensive once you start syncing a ton of data. So I would optimize for syncing less data in favor or using more Firebase listeners.

Cheers,
Jacob

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[Piotr Kaminski]

Jason, you might also be interested in this discussion from a couple months back: https://groups.google.com/d/msg/firebase-talk/Rbjwoa_PoxE/6gZkU3IxdDwJ

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