goValidatorProvideErrorOnJsonTags

goValidatorProvideErrorOnJsonTags.go

package main

import (
	"fmt"
	"github.com/go-playground/validator"
	"reflect"
	"regexp"
	"strings"
)


type Student struct {
	Name      string    `json:"name" validate:"omitempty,noSplChars"`
}
func main() {
	bob := &Student{
		Name: "*^*(&^*&",
	}

	appValidator := validator.New()
	_ = appValidator.RegisterValidation("noSplChars", validateNoSplChars)

	appValidator.RegisterTagNameFunc(func(fld reflect.StructField) string {
		name := strings.SplitN(fld.Tag.Get("json"), ",", 2)[0]

		if name == "-" {
			return ""
		}

		return name
	})

	err := appValidator.Struct(bob)
	if err != nil{

		validationErrors := err.(validator.ValidationErrors)
		fmt.Println("validationErrors",validationErrors)
	}

	print("done")
}


func validateNoSplChars(fl validator.FieldLevel) bool {
	stringField := fl.Field().String()

	regex, _ := regexp.Compile("[a-zA-Z0-9].*$")
	result := regex.MatchString(stringField)
	return result
}