Update is ignoring the Limit clause - postgresql

Question

Gorm doesn't seem to support the use of Limit with Update, and doesn't throw an error either.
resUpdate := tx.Model(&daos.Voucher{}).
Where("status = ?", models.VoucherStatusAvailable).
Limit(quantity).
Scan(&vouchers).
Update("status", models.VoucherStatusBooked)
This query will update every field in my DB from VoucherStatusAvailable to VoucherStatusBooked, without regards for the use of Limit.
Someone quickly addressed the subject here : https://penkovski.com/post/gorm-update-returning/
But their solution of putting the Limit in the Where clause :
resUpdate := tx.Model(&daos.Voucher{}).
Where("status = ? LIMIT ?", models.VoucherStatusAvailable, quantity).
Update("status", models.VoucherStatusBooked)
doesn't work when using gorm soft delete, since it put parentheses around the where clause, and the AND deleted_at = NULL filter after it.
Initially I was doing it with two separated query (a select then an update) but in this case there is a chance of conflict.
Does anyone have an idea of how I should do the selection of X members of the table, then update their status, without having a risk of conflict with the selected items ?
Edit : The DBMS I'm using is PostgreSQL

Answer 1

Different point were answered :
Postgre doesn't support LIMIT and ORDER BY, so I needed an alternative.
The right alternative seemed to be CTEs, as pointed out in a comment.
gorm support custom plugin, and there is a plugin that implement CTE : https://github.com/WinterYukky/gorm-extra-clause-plugin. Unfortunately, it isn't compatible with the Update clause.
So ultimately, the only solution I found is to do a CTE in raw SQL :
var updated []Voucher
resUpdate := tx.Raw(`WITH v AS (
SELECT * from vouchers WHERE status = ?
LIMIT ?
)
UPDATE vouchers SET status = ?
WHERE EXISTS (SELECT * FROM v WHERE vouchers.id = v.id)
RETURNING *`,
models.ArticleStatusAvailable, quantity, models.VoucherStatusBooked).
Scan(&updated)