在写Restful API时,时常要序列化嵌套的资源,有时还需要定制序列化的字段。传统的方法只有进行结构体嵌套,然后还有将结构体转成map,剔除掉不需要的字段,比较繁琐。而jsonfn使用对象方法的思路,简化了这一流程。
一、序列化指定的字段
import "github.com/liamylian/jsonfn"
type Book struct {
Id int
Title string
AuthorId int
}
// 只序列化Id, Title
// bytes = {"Id":1,"Title":"Jane Eyre"}
bytes, _, := jsonfn.Marshal(Book{Id: 1, Title: "Jane Eyre", AuthorId: 2}, "Id", "Title")
// 序列化所有字段
// bytes = {"AuthorId":2,Id":1,"Title":"Jane Eyre"}
bytes, _, := jsonfn.Marshal(Book{Id: 1, Title: "Jane Eyre", AuthorId: 2})
bytes, _, := jsonfn.Marshal(Book{Id: 1, Title: "Jane Eyre", AuthorId: 2}, "*")
二、序列化嵌套资源
通过给Book和Author,分别添加Author和Country方法,可以在序列化Book时嵌套Author,而Author又嵌套了Country。
import (
"github.com/liamylian/jsonfn"
"strconv"
"time"
)
type Book struct {
Id int
Title string
AuthorId int
CreatedAt time.Time
}
func (b Book) Author() Author {
return Author{
Id: b.AuthorId,
Name: "author" + strconv.Itoa(b.AuthorId),
}
}
type Author struct {
Id int
Name string
CountryId int
}
func (a Author) Country() Country {
return Country{
Id: a.CountryId,
Name: "country" + strconv.Itoa(a.CountryId),
}
}
type Country struct {
Id int
Name string
}
func main() {
book := Book{
Id: 1,
Title: "Jane Eyre",
AuthorId: 2,
CreatedAt: time.Now(),
}
// output:
//
// {
// "Id": 1,
// "Title": "Jane Eyre",
// "Author": {
// "Id": 2,
// "Name": "author2"
// "Country": {
// "Id": 0,
// "Name": "country0"
// }
// }
// }
jsonStr, _ := jsonfn.Marshal(book, "Id", "Title", "Author{Id,Name}", "Author:Country{}")
fmt.Println("%s", jsonStr)
}
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