Gin: examples about validator.v9 Translations & Custom Errors

[YahuiAn]

I know in the validator.v9,it has the function of Translations & Custom Errors

now I see gin v1.5.0 has upgraded validator to v9, but I didn't find out some examples about
Translations & Custom Errors in gin.

can anyone help me,thanks in advance.

Environment

• go version: 1.13
• gin version (or commit ref): v1.5.0
• operating system: win10

[swrap]

There is an example in the validators repo like you mentioned. To mix it in with gin you just have to access the underlying validator engine to set it up:

import (
    "github.com/gin-gonic/gin/binding"
    "github.com/go-playground/locales/en"
    ut "github.com/go-playground/universal-translator"
    en_translations "gopkg.in/go-playground/validator.v9/translations/en"
)
...
var trans ut.Translator
...
if v, ok := binding.Validator.Engine().(*validator.Validate); ok {
    en := en.New()
    uni := ut.New(en, en)
    // this is usually know or extracted from http 'Accept-Language' header
    // also see uni.FindTranslator(...)
    trans, _ = uni.GetTranslator("en")
    en_translations.RegisterDefaultTranslations(v, trans)
}
...

and then when you validate:

...
type IceCream struct {
    Title           string `json:"title" binding:"required,min=4,max=30"`
}

var iceCream IceCream 
if err := c.ShouldBindJSON(&iceCream); err != nil {
    c.AbortWithStatusJSON(http.StatusBadRequest, gin.H{
        "error" : err.(validator.ValidationErrors).Translate(trans),
    })
    return
}
...

Its basically just copying and pasting some code from both repos, so that all the pieces come together. Best of luck!

[YahuiAn]

@swrap Thank you very much.It's an elegant solution.