Created
June 29, 2021 14:31
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goValidatorErrorTranslation
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package main | |
import ( | |
"fmt" | |
"github.com/go-playground/locales/en" | |
ut "github.com/go-playground/universal-translator" | |
"github.com/go-playground/validator/v10" | |
en_translations "github.com/go-playground/validator/v10/translations/en" | |
"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) | |
} | |
english := en.New() | |
uni := ut.New(english, english) | |
translator, _ := uni.GetTranslator("en") | |
_ = en_translations.RegisterDefaultTranslations(appValidator, translator) | |
errStartsWith := "Field - `{0}` should starts with alpha numeric" | |
addTranslation("should_start_with_alpha_numeric", errStartsWith, appValidator, &translator) | |
print("done") | |
} | |
func addTranslation(tag string, errMessage string, appValidator *validator.Validate, translator *ut.Translator) { | |
registerFn := func(ut ut.Translator) error { | |
return ut.Add(tag, errMessage, true) | |
} | |
transFn := func(ut ut.Translator, fe validator.FieldError) string { | |
param := fe.Param() | |
tag := fe.Tag() | |
t, err := ut.T(tag, fe.Field(), param) | |
if err != nil { | |
return fe.(error).Error() | |
} | |
return t | |
} | |
_ = appValidator.RegisterTranslation(tag, *translator, registerFn, transFn) | |
} | |
func validateNoSplChars(fl validator.FieldLevel) bool { | |
stringField := fl.Field().String() | |
regex, _ := regexp.Compile("[a-zA-Z0-9].*$") | |
result := regex.MatchString(stringField) | |
return result | |
} |
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