Create和NewRecord有什么区别？

Question

According to the document and gorm repo's issue,
db.Create is insert record.
db.NewRecord is only check if current value has primary key or not. So do not insert record.

I wrote below this code.
But I could insert record with db.Create and db.NewRecord.

What's different between this two methods?

for _, v := range oneday.Onedays {
    if err := tx.Create(&v).Error; err != nil {
        tx.Rollback()
        return model.ResOnedays{}, err
    }

    // Photos
    for i, pv := range v.Photos {
        res := tx.NewRecord(&pv)
    }

    // Tags
    for _, tv := range v.Tags {
        tx.NewRecord(&tv)
    }
}

Answer 1

As you pointed out, Create creates a new row by issuing an INSERT.

NewRecord doesn't affect the database at all, it just returns true if the current value's primary key is unset, meaning it's a new record. This means calling NewRecord in void context, as you have done, is meaningless, since you're ignoring the return value.