Gorm composite primary key does not work as expected

h2. model

type PriceDaily struct {
    Product string `gorm:"primaryKey"`
    Date    string `gorm:"primaryKey"`
    Price   uint64
}

h2. code

func somefn()  error{
    pd1 := PriceDaily{Product: "jinzhu", Date: "20220110", Price: 100}
    pd2 := PriceDaily{Product: "jinzhu", Date: "20220111", Price: 10000}
    err := DB.Save(&pd1).Error
    if err != nil {
        return err
    }
    err = DB.Save(&pd2).Error
    if err != nil {
        return err
    }
}

h2. ERROR

Error 1062: Duplicate entry 'jinzhu' for key 'PRIMARY'

h2.truth

after describe table I found only the product field is PRI, the date field is MUL instead of PRI.

h2. question

am I using gorm wrong or this is a bug?

Comment From: jinzhu

tests pass for me, maybe the table is not created GORM?

FYI, GORM can't auto migrate primary fields.