Using govalidator custom validation messages to implement i18n

readme.md

This example uses the LANG env var so these commands set it as courtesy.

LANG=zh_CN.UTF-8 go run main.go
格式错误

LANG=en_GB.UTF-8 go run main.go
Invalid email address

main.go

package main

import (
	"fmt"
	"os"

	"github.com/asaskevich/govalidator"
	// my pretend module with some translation logic
	"github.com/my/translations"
)

type person struct {
	Name  string `valid:"-"`
	Email string `valid:"email~EMAIL_INVALID"` // email is not correct || email 格式错误
}

func main() {
	translations.SetLocale("en_GB.UTF-8")

	p := person{Name: "clearcodecdn", Email: "jjj"}
	_, err := govalidator.ValidateStruct(p)
	if err != nil {
		localeAwareText := translations.Translate(err.Error())
		fmt.Println(localeAwareText)
		return
	}

	// no validation errors
	fmt.Println("All OK")
}

translations.go

package translations

import (
  "github.com/my/translations/en_gb"
  "github.com/my/translations/zh_CN"
)

var locale string

func SetLocale(myLocale string) {
  // checked against some whitelist
  locale = myLocale
}

func Translate(myStr string) (string, ok) {
  if locale == "en_GB.UTF-8" {
    // the particular translations could come from a file, a database, an API or whatever.
    translation, ok := en_gb.Lookup(myStr)
  }

  // etc, or a switch or something

  return translation, ok
}