How to retrieve the last element from a nested node in firebase?

MIT App Inventor Help
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1

Hello,

This is my node of interest:
fb_retrieval pblm
The (sub) tags are milli seconds in UTC and I noticed that they seem to be getting added at the last (the most recent instant would be the largest no. so they are being added at the last place I guess) I would like to retrieve the last instant but the below blocks give the entries in jumbled order (see textbox o/p in the screenshot) and ultimately results in random entry to be extracted!

fb_retrieval_app screen shot
fb_retrieval_app screen shot1080×2280 90.6 KB

These are the code blocks:

firebase retrieval pblm
firebase retrieval pblm556×614 42.8 KB

I tried just taking the taglist for “FEED TIME STAMP” but the o/p is still similar to the one in the screenshot!

I could just find the MAX( taglist from FEED TIME STAMP) and retrieve its value but I am hoping there’ll be an elegant solution to this !!

Thanks,

2

That is the way to do it!

Unless you do some additional work, setup some indexes in firebase, and then use the REST API/WEB approach with the web component and webviewer to call back the tags with orderBy