model

type UomCategory struct {
	gorm.Model
	Name string `gorm:"size:32;not null"`
}

type UomType string

type UomUom struct {
	gorm.Model
	Name        string `gorm:"size:60;not null"` //
	UomCategory UomCategory
	Factor      float32      `gorm:"default:1.0;check:factor <> 0"`
	FactorInv   float32      `gorm:"-"` // 计算属性
	Rounding    float32      `gorm:"check:rouding > 0"`
	Active      sql.NullBool `gorm:"default:true"`
	UomType     UomType      `gorm:"size:32;default:reference"`
}