المحققون المخصصون
يستخدم Gin مكتبة go-playground/validator للتحقق على مستوى الحقول. بالإضافة إلى المحققين المدمجين (مثل required، email، min، max)، يمكنك تسجيل دوال التحقق المخصصة الخاصة بك.
المثال أدناه يسجّل محققاً bookabledate يرفض التواريخ في الماضي، مما يضمن أن تواريخ تسجيل الوصول والمغادرة تكون دائماً في المستقبل.
package main
import ( "net/http" "time"
"github.com/gin-gonic/gin" "github.com/gin-gonic/gin/binding" "github.com/go-playground/validator/v10")
// Booking contains binded and validated data.type Booking struct { CheckIn time.Time `form:"check_in" binding:"required,bookabledate" time_format:"2006-01-02"` CheckOut time.Time `form:"check_out" binding:"required,gtfield=CheckIn,bookabledate" time_format:"2006-01-02"`}
var bookableDate validator.Func = func(fl validator.FieldLevel) bool { date, ok := fl.Field().Interface().(time.Time) if ok { today := time.Now() if today.After(date) { return false } } return true}
func main() { route := gin.Default()
if v, ok := binding.Validator.Engine().(*validator.Validate); ok { v.RegisterValidation("bookabledate", bookableDate) }
route.GET("/bookable", getBookable) route.Run(":8085")}
func getBookable(c *gin.Context) { var b Booking if err := c.ShouldBindWith(&b, binding.Query); err == nil { c.JSON(http.StatusOK, gin.H{"message": "Booking dates are valid!"}) } else { c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()}) }}اختبره
# Both dates are in the future and check_out > check_incurl "http://localhost:8085/bookable?check_in=2118-04-16&check_out=2118-04-17"# Output: {"message":"Booking dates are valid!"}
# check_out is before check_in -- fails gtfield validationcurl "http://localhost:8085/bookable?check_in=2118-03-10&check_out=2118-03-09"# Output: {"error":"Key: 'Booking.CheckOut' Error:Field validation for 'CheckOut' failed on the 'gtfield' tag"}