Gorm foreign 密钥

有谁知道为什么这个代码不能工作，以及如何解决它？

type Model struct {
    ID        uuid.UUID `gorm:"type:uuid;primary_key;"`
    CreatedAt time.Time
    UpdatedAt time.Time
    DeletedAt *time.Time `sql:"index"`
}

func (model *Model) BeforeCreate(tx *gorm.DB) (err error) {
    model.ID = uuid.New()
    return
}

type User struct {
    Model
    Name                string
    Email               string `gorm:"primaryKey"`
    Description         string
    AccountCredentials  AccountCredentials  `gorm:"foreignKey:Email,constraint:OnUpdate:CASCADE,onDelete:CASCADE"`
    AccountVerification AccountVerification `gorm:"foreignKey:Email,constraint:OnUpdate:CASCADE,onDelete:CASCADE"`
}

type AccountCredentials struct {
    Email    string `gorm:"primaryKey"`
    Password string
}

type AccountVerification struct {
    Email               string `gorm:"primaryKey"`
    VerificationCode    string
    VerificationCodeTTL int64
    IsVerified          bool
    CreatedAt           time.Time `gorm:"autoCreateTime:true"`
}

当我自动迁移DB时:

    db.AutoMigrate(&model.AccountCredentials{}, &model.AccountVerification{}, &model.User{})

我收到以下错误:

为struct pkg/Model找到无效的字段.用户的字段Account Credentials:为关系定义有效的外键或实现Valuer/Scanner接口