DATE_ADD Query on Laravel show unexpected results

Question

I have this query on mySQL

SELECT updated_at 
FROM products
WHERE updated_at >= DATE_ADD(NOW(), INTERVAL -7 DAY)
GROUP BY day(updated_at)
ORDER BY updated_at desc

and I try to apply it on Laravel like this

$date = Products::select('updated_at')
            ->where('updated_at', '>=', 'DATE_ADD(NOW(), INTERVAL -7 DAY)')
            ->groupBy('updated_at')
            ->orderBy('updated_at', 'desc')
            ->get()

and the results on Laravel is show all data in updated_at column, not just 6 days before now. Is there anything wrong with my query on Laravel, thank you

Answer 1

You have to use whereRaw instead:

$date = Products::select('updated_at')
                ->whereRaw('updated_at >= DATE_ADD(NOW(), INTERVAL -7 DAY)')
                ->groupBy('updated_at')
                ->orderBy('updated_at', 'desc')
                ->get()

Answer 2

Another use case is when you need to actually add an interval to a date column and compare that to now(), like comparing 2 days after start_date to now(). You would have to do exactly like this (laravel 5.7):

• where 'start_date' is the column name,
• keywords 'interval' & 'day' must be lowercase (or any other similar needed keywords)
• and brackets surrounding comparison date

->whereRaw('start_date + interval 2 day >= ?', [now()]);

I found the working answer here: https://laracasts.com/discuss/channels/eloquent/adding-days-to-a-date-in-a-where-query