在golang xorm中使用postgresql的json,array类型的操作

type Int64Array []int64

func (s *Int64Array) FromDB(bts []byte) error {
	if len(bts) == 0 {
		return nil
	}

	str := string(bts)
	if strings.HasPrefix(str, "{") {
		str = "[" + str[1:len(str)]
	}

	if strings.HasSuffix(str, "}") {
		str = str[0: len(str)-1] + "]"
	}

	var ia = &[]int64{}

	err := json.Unmarshal([]byte(str), ia)
	if err != nil {
		return err
	}

	*s = Int64Array(*ia)
	return nil
}

func (s *Int64Array) ToDB() ([]byte, error) {
	return serializeBigIntArray(*s, "{", "}"), nil
}

func (arr Int64Array) MarshalJSON() ([]byte, error) {
	return serializeBigIntArrayAsString(arr, "[", "]"), nil
}

func (arr *Int64Array) UnmarshalJSON(b []byte) error {
	var strarr []string
	var intarr []int64

	err := json.Unmarshal(b, &strarr)
	if err != nil {
		return err
	}

	for _, s := range strarr {
		i, err := strconv.ParseInt(s, 10, 64)
		if err != nil {
			return err
		}

		intarr = append(intarr, i)
	}

	*arr = intarr
	return nil
}

func serializeBigIntArray(s []int64, prefix string, suffix string) []byte {
	var buffer bytes.Buffer

	buffer.WriteString(prefix)

	for idx, val := range s {
		if idx > 0 {
			buffer.WriteString(",")
		}
		buffer.WriteString(strconv.FormatInt(val, 10))
	}

	buffer.WriteString(suffix)

	return buffer.Bytes()
}

func serializeBigIntArrayAsString(s []int64, prefix string, suffix string) []byte {
	var buffer bytes.Buffer

	buffer.WriteString(prefix)

	for idx, val := range s {
		if idx > 0 {
			buffer.WriteString(",")
		}
		buffer.WriteString("\"")
		buffer.WriteString(strconv.FormatInt(val, 10))
		buffer.WriteString("\"")
	}
	buffer.WriteString(suffix)
	return buffer.Bytes()
}

type Cover struct {
 Id   int64  `json:"id,omitempty"`
 Fid  string `json:"fid,omitempty"`
 Type int8   `json:"type,omitempty"`
 Url  string `json:"url,omitempty"`
}

func (c *Cover) FromDB(bytes []byte) error {
 return json.Unmarshal(bytes, c)
}

func (c *Cover) ToDB() (bytes []byte, err error) {
 bytes, err = json.Marshal(c)
 return
}

type Course struct {
	Id            int64             `json:"id,string" form:"id"`
	Name          string            `json:"name" form:"name"`
	Brief         string            `json:"brief" form:"brief"`
	Description   string            `json:"description" form:"description"`
	Cover         common.Cover      `xorm:"Text" json:"cover" form:"cover"`
	Categories    common.Int64Array `xorm:"Text" json:"categories" form:"categories[]"`
	Tags          common.Int64Array `json:"tags" form:"tags[]"`
	Difficulty    float64           `json:"difficulty" form:"difficulty"`
	Price         float64           `json:"price" form:"price"`
	Markets       common.Int64Array `json:"markets" form:"markets[]"`
	StudentAmount int64             `json:"studentAmount" form:"studentAmount"`
	SubjectAmount int64             `json:"subjectAmount" form:"subjectAmount"`
	Crt           time.Time         `json:"crt"`
	Lut           time.Time         `json:"lut"`
	Status        int16             `json:"status" form:"status"`
	common.Page                     `xorm:"-"`
}

c.JSON(http.StatusOK,gin.H{})操作

type UserGroup struct {
    MyUser  User `xorm:"extends" json:"你要json中返回的名字"`
    MyGroup Group `xorm:"extends" json:"你要json中返回的名字"`
}