Laravel - update is incrementing the ID?

Hello guys,

I'm making an API using Laravel. In one of my scripts, I make an update on a field, like this :

user::where('uuid', $uuid)->update(['date' => $date]);

I noticed that the primary key increments when doing this. My obvious conclusion is that Eloquent makes a delete - insert in place of a regular MySQL update.

And so the question is, why ?

Thanks ahead.

via Chebli Mohamed