英文:
Custom UnmarshalJSON for custom time format returning this {0 63082400645 <nil>} instead of time with ShouldBindJSON from Gin gonic
问题
我有这个类型和处理程序
type Bday time.Timefunc (mt *Bday) UnmarshalJSON(bs []byte) (err error) {var t time.Timelayout := "2006-01-02T15:04:05Z0700" // RFC3339s := strings.Trim(string(bs), `"`)t, err = time.Parse(layout, s)if err != nil {return err}*mt = Bday(t)return}func (mt Bday) MarshalJSON() ([]byte, error) {timestamp := time.Time(mt)return json.Marshal(timestamp)}type LoginHandler struct {db *gorm.DB}func (l *LoginHandler) Signup(c *gin.Context) {// 验证姓名、姓氏、电子邮件、密码、性别、出生日期var user Userif err := c.ShouldBindJSON(&user); err != nil {c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})return}hashedPassword, err := bcrypt.GenerateFromPassword([]byte(user.Password), 8)if err != nil {c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})return}user.Password = string(hashedPassword)fmt.Println("User", user)// 保存到数据库l.db.Debug().Model(&models.User{}).Create(&user)// 返回代码201c.JSON(http.StatusCreated, gin.H{"message": "用户创建成功！"})}
这是用户
type User struct {Password string `json:"password"`Email string `json:"email"`Name string `json:"name"`LastName string `json:"last_name"`Bday Bday `json:"bday"`Gender string `json:"gender"`CreatedAt time.Time `json:"created_at"`UpdatedAt time.Time `json:"updated_at"`DeletedAt time.Time `json:"deleted_at"`}
当我在处理程序中打印用户时，我得到了Bday字段的以下输出
{0 63082400645 <nil>}
这是完整的println
User {$2a$08$uTE7Llc6YM2owu.D6UWqpOcOVFHRFRrSxbkxWV4ecR72G6kK5/SNq d.n.m@gmail.comAntonio Magalhães {0 63082400645 <nil>} M 0001-01-01 00:00:00 +0000 UTC 0001-01-0100:00:00 +0000 UTC 0001-01-01 00:00:00 +0000 UTC}
我期望的是Bday是一个类似日期的东西
2001-01-01 00:00:00 +0000 UTC
有人可以帮我理解这个吗？
英文:
I have this type and handler
type Bday time.Timefunc (mt *Bday) UnmarshalJSON(bs []byte) (err error) {var t time.Timelayout := "2006-01-02T15:04:05Z0700" // RFC3339s := strings.Trim(string(bs), `"`)t, err = time.Parse(layout, s)if err != nil {return err}*mt = Bday(t)return}func (mt Bday) MarshalJSON() ([]byte, error) {timestamp := time.Time(mt)return json.Marshal(timestamp)}type LoginHandler struct {db *gorm.DB}func (l *LoginHandler) Signup(c *gin.Context) {// Verify name, lastName, email, password, gender, birthDatevar user Userif err := c.ShouldBindJSON(&user); err != nil {c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})return}hashedPassword, err := bcrypt.GenerateFromPassword([]byte(user.Password), 8)if err != nil {c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})return}user.Password = string(hashedPassword)fmt.Println("User", user)// Save to dbl.db.Debug().Model(&models.User{}).Create(&user)// Return code 201c.JSON(http.StatusCreated, gin.H{"message": "User created successfully!"})}
This is the User
type User struct {Password string `json:"password"`Email string `json:"email"`Name string `json:"name"`LastName string `json:"last_name"`Bday Bday `json:"bday"`Gender string `json:"gender"`CreatedAt time.Time `json:"created_at"`UpdatedAt time.Time `json:"updated_at"`DeletedAt time.Time `json:"deleted_at"`}
When I print User in the handler I get this for the Bday field
{0 63082400645 <nil>}
This is the full println
User {$2a$08$uTE7Llc6YM2owu.D6UWqpOcOVFHRFRrSxbkxWV4ecR72G6kK5/SNq d.n.m@gmail.comAntonio Magalhães {0 63082400645 <nil>} M 0001-01-01 00:00:00 +0000 UTC 0001-01-0100:00:00 +0000 UTC 0001-01-01 00:00:00 +0000 UTC}
What I expected whas that Bday were something like a date
2001-01-01 00:00:00 +0000 UTC
Can somebody help me understand this?
答案1
得分: 1
你自定义的类型 Bday 既不满足 Formatter 接口，也不满足 Stringer 接口，因此会以复合结构的形式打印出来（底层 time.Time 结构的字段会逐个打印出来）。
一个简单的解决方法是实现一个 String() 方法，例如委托给 MarshalJSON：
func (mt Bday) String() string {b, _ := mt.MarshalJSON()return string(b)}
有关 fmt.Println 如何工作的更多详细信息，请参考 fmt 包 的文档。
英文:
Your custom type Bday satisfies neither Formatter nor Stringer interface, and thus gets printed as a compound struct (the fields of the underlying time.Time struct are printed individually).
An easy fix would be to implement a String() method, for example delegating to MarshalJSON:
func (mt Bday) String() string {b, _ := mt.MarshalJSON()return string(b)}
For more details on how fmt.Println works refer to fmt package documentation.
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