Optimistic update with a patch method

Hello there, i'm trying a optimistic update (patch), it look like working good but I don't really know if my code is good for that.

The goal is to update the status of my users. If anyone can tell my if the I do the thing are good or not.
I'm wondering too if is normal that i can't get the total info of my user in the 'previousUser' ? It look like it return nothing.
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