I have a pivot table

id | product_id | user_id

I wish to update this pivot table, I do so by:

Product::find($productId)->attach($userId);

This will produce something like

id | product_id | user_id
 1        1          1

But then when I do it again I do not want to update the pivot table if the values already exists.

The above attach method would do something like:

id | product_id | user_id
 1        1          1
 1        1          1

I know you can use sync, but this removes everything from the table, I do not wish to do this. I also know you can use:

Product::find(1)->user()->updateExistingPivot(1, []);

But this only works when data is in the table.

What Im looking for is a way to do firstOrCreate on a pivot table.