自定义验证器

注册自定义验证器，查看示例代码.

  1. package main
  3. import (
  4.     "net/http"
  5.     "reflect"
  6.     "time"
  8.     "github.com/gin-gonic/gin"
  9.     "github.com/gin-gonic/gin/binding"
  10.     "github.com/go-playground/validator/v10"
  11. )
  13. // Booking 包含绑定和验证的数据。
  14. type Booking struct {
  15.     CheckIn  time.Time `form:"check_in" binding:"required,bookabledate" time_format:"2006-01-02"`
  16.     CheckOut time.Time `form:"check_out" binding:"required,gtfield=CheckIn,bookabledate" time_format:"2006-01-02"`
  17. }
  19. var bookableDate validator.Func = func(fl validator.FieldLevel) bool {
  20.     date, ok := fl.Field().Interface().(time.Time)
  21.     if ok {
  22.         today := time.Now()
  23.         if today.After(date) {
  24.             return false
  25.         }
  26.     }
  27.     return true
  28. }
  30. func main() {
  31.     route := gin.Default()
  33.     if v, ok := binding.Validator.Engine().(*validator.Validate); ok {
  34.         v.RegisterValidation("bookabledate", bookableDate)
  35.     }
  37.     route.GET("/bookable", getBookable)
  38.     route.Run(":8085")
  39. }
  41. func getBookable(c *gin.Context) {
  42.     var b Booking
  43.     if err := c.ShouldBindWith(&b, binding.Query); err == nil {
  44.         c.JSON(http.StatusOK, gin.H{"message": "Booking dates are valid!"})
  45.     } else {
  46.         c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
  47.     }
  48. }
  1. $ curl "localhost:8085/bookable?check_in=2018-04-16&check_out=2018-04-17"
  2. {"message":"Booking dates are valid!"}
  4. $ curl "localhost:8085/bookable?check_in=2018-03-08&check_out=2018-03-09"
  5. {"error":"Key: 'Booking.CheckIn' Error:Field validation for 'CheckIn' failed on the 'bookabledate' tag"}

结构体级别的验证器 也可以通过其他的方式注册。更多信息请参阅 struct-lvl-validation 示例。

Last modified 01.08.2020 : chore: update Custom validators (a39a8b4)