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129 lines
3.1 KiB
129 lines
3.1 KiB
package main
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import (
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"fmt"
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"github.com/go-playground/locales/en"
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ut "github.com/go-playground/universal-translator"
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"gopkg.in/go-playground/validator.v9"
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en_translations "gopkg.in/go-playground/validator.v9/translations/en"
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)
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// User contains user information
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type User struct {
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FirstName string `validate:"required"`
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LastName string `validate:"required"`
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Age uint8 `validate:"gte=0,lte=130"`
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Email string `validate:"required,email"`
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FavouriteColor string `validate:"iscolor"` // alias for 'hexcolor|rgb|rgba|hsl|hsla'
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Addresses []*Address `validate:"required,dive,required"` // a person can have a home and cottage...
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}
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// Address houses a users address information
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type Address struct {
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Street string `validate:"required"`
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City string `validate:"required"`
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Planet string `validate:"required"`
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Phone string `validate:"required"`
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}
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// use a single instance , it caches struct info
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var (
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uni *ut.UniversalTranslator
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validate *validator.Validate
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)
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func main() {
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// NOTE: ommitting allot of error checking for brevity
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en := en.New()
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uni = ut.New(en, en)
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// this is usually know or extracted from http 'Accept-Language' header
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// also see uni.FindTranslator(...)
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trans, _ := uni.GetTranslator("en")
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validate = validator.New()
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en_translations.RegisterDefaultTranslations(validate, trans)
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translateAll(trans)
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translateIndividual(trans)
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translateOverride(trans) // yep you can specify your own in whatever locale you want!
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}
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func translateAll(trans ut.Translator) {
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type User struct {
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Username string `validate:"required"`
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Tagline string `validate:"required,lt=10"`
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Tagline2 string `validate:"required,gt=1"`
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}
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user := User{
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Username: "Joeybloggs",
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Tagline: "This tagline is way too long.",
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Tagline2: "1",
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}
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err := validate.Struct(user)
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if err != nil {
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// translate all error at once
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errs := err.(validator.ValidationErrors)
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// returns a map with key = namespace & value = translated error
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// NOTICE: 2 errors are returned and you'll see something surprising
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// translations are i18n aware!!!!
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// eg. '10 characters' vs '1 character'
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fmt.Println(errs.Translate(trans))
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}
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}
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func translateIndividual(trans ut.Translator) {
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type User struct {
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Username string `validate:"required"`
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}
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var user User
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err := validate.Struct(user)
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if err != nil {
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errs := err.(validator.ValidationErrors)
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for _, e := range errs {
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// can translate each error one at a time.
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fmt.Println(e.Translate(trans))
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}
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}
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}
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func translateOverride(trans ut.Translator) {
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validate.RegisterTranslation("required", trans, func(ut ut.Translator) error {
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return ut.Add("required", "{0} must have a value!", true) // see universal-translator for details
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}, func(ut ut.Translator, fe validator.FieldError) string {
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t, _ := ut.T("required", fe.Field())
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return t
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})
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type User struct {
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Username string `validate:"required"`
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}
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var user User
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err := validate.Struct(user)
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if err != nil {
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errs := err.(validator.ValidationErrors)
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for _, e := range errs {
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// can translate each error one at a time.
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fmt.Println(e.Translate(trans))
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}
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}
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}
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