laravel - Updating a pivot table -

i have pivot table

id | product_id | user_id

i wish update pivot table, by:

product::find($productid)->attach($userid);

this produce like

id | product_id | user_id  1        1          1

but when again not want update pivot table if values exists.

the above attach method like:

id | product_id | user_id  1        1          1  1        1          1

i know can use sync, removes table, not wish this. know can use:

product::find(1)->user()->updateexistingpivot(1, []);

but works when data in table.

what im looking way firstorcreate on pivot table.

you can add boolean sync method adds value , doesn't remove existing value.

the code looks this. first value can int or array.

product::find(1)->user()->sync([1], false);

harsh