用grom 自定义字段，怎么解析mysql 字符串类型的json 数组

``` type WarehouseCheckGoods struct { ID int64 `gorm:"column:id" db:"column:id" json:"id" form:"id"` GoodsId int64 `gorm:"column:goods_id" db:"column:goods_id" json:"goods_id" form:"goods_id"` SkuCode string `gorm:"column:sku_code" db:"column:sku_code" json:"sku_code" form:"sku_code"` Remarks string `gorm:"column:remarks" db:"column:remarks" json:"remarks" form:"remarks"` RealNumber int64 `gorm:"column:real_number" db:"column:real_number" json:"real_number" form:"real_number"` BookNumber int64 `gorm:"column:book_number" db:"column:book_number" json:"book_number" form:"book_number"` AdjustNumber int64 `gorm:"column:adjust_number" db:"column:adjust_number" json:"adjust_number" form:"adjust_number"` WarehouseCheckId int64 `gorm:"column:warehouse_check_id" db:"column:warehouse_check_id" json:"warehouse_check_id" form:"warehouse_check_id"` ThreeWarehouse AutoGenerated `gorm:"column:three_warehouse" db:"column:three_warehouse" json:"three_warehouse" form:"three_warehouse"` CreatedAt time.Time `gorm:"column:created_at" db:"column:created_at" json:"created_at" form:"created_at"` UpdatedAt time.Time `gorm:"column:updated_at" db:"column:updated_at" json:"updated_at" form:"updated_at"` } type AutoGenerated []struct { WarehouseID int `json:"warehouse_id"` BookNumber string `json:"book_number"` AdjustNumber string `json:"adjust_number"` } func (j *AutoGenerated) Scan(value interface{}) error { bytes, _ := value.([]uint8) var lins AutoGenerated json.Unmarshal([]byte(bytes), &lins) //打印lins ，输出正常 j = &lins // 把值赋给 指针，输出是null return nil } func (j AutoGenerated) Value() (driver.Value, error) { return j, nil } ``` 其中ThreeWarehouse 这个字段为json 数组格式的字符 格式 ``` [{"warehouse_id":1,"book_number":"0","adjust_number":"15"}] ``` 然后我自定义的类型AutoGenerated，代码如上方，我把json绑定到结构体，打印都正常，但是赋值给指针，后接口请求不正常；哪位大神知道下，我这种怎么处理，谢谢🙏