Model Fields with *[]byte Are Not Set to NULL When Assigned nil

[KiddoV]

Description

When attempting to set a *[]byte field to nil in the database, GORM does not update the field to NULL as expected. Instead, the field retains its previous value in the database.

Reproduction Steps:

1. Define a model with a *[]byte field:

type AoiPcb struct {
    ID              uint      `gorm:"primaryKey"`
    PcbActualImgBot *[]byte   `gorm:"default:NULL"`
}

2. Attempt to set the PcbActualImgBot field to nil using:

tx.Model(&AoiPcb{}).Where("id = ?", 1).Update("PcbActualImgBot", nil)

3. Observe that the field does not update to NULL in the database.

Expected Behavior:

The field should be updated to NULL in the database when nil is assigned.

Actual Behavior:

The field retains its previous value and does not update to NULL.

[github-actions]

The issue has been automatically marked as stale as it missing playground pull request link, which is important to help others understand your issue effectively and make sure the issue hasn't been fixed on latest master, checkout https://github.com/go-gorm/playground for details. it will be closed in 30 days if no further activity occurs. if you are asking question, please use the Question template, most likely your question already answered https://github.com/go-gorm/gorm/issues or described in the document https://gorm.io ✨ Search Before Asking ✨