For updateOrCreate I suggest work the example from documentation to get a better understanding of how it works.
Also look it up in the API to further study it's inner workings:
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If I need the upsert function but I'm using Laravel 6. Is my only option to use a foreach loop and individually insert the rows using something like updateOrCreate ?
Because I get an array from the request:
['id_x' => 'data', 'id_y' => 'data']
And I need to either insert each value to a new row, or update the row if the id exists
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