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Clarify and complete tag names example

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This commit is contained in:
Jean-Philippe Moal 2019-10-17 20:02:12 +02:00 • committed by Dean Karn
parent 703c0b681a
commit 1effcb06a7
2 changed files with 21 additions and 10 deletions
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4
_examples/simple/main.go
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@ -68,8 +68,8 @@ func validateStruct() {
fmt.Println(err.Namespace())
fmt.Println(err.Field())
fmt.Println(err.StructNamespace()) // can differ when a custom TagNameFunc is registered or
fmt.Println(err.StructField()) // by passing alt name to ReportError like below
fmt.Println(err.StructNamespace())
fmt.Println(err.StructField())
fmt.Println(err.Tag())
fmt.Println(err.ActualTag())
fmt.Println(err.Kind())

27
_examples/struct-level/main.go
View file

@ -2,6 +2,8 @@ package main
import (
"fmt"
"reflect"
"strings"
"github.com/go-playground/validator/v10"
)
@ -11,7 +13,7 @@ type User struct {
FirstName string `json:"fname"`
LastName string `json:"lname"`
Age uint8 `validate:"gte=0,lte=130"`
Email string `validate:"required,email"`
Email string `json:"e-mail" validate:"required,email"`
FavouriteColor string `validate:"hexcolor|rgb|rgba"`
Addresses []*Address `validate:"required,dive,required"` // a person can have a home and cottage...
}
@ -31,6 +33,15 @@ func main() {
validate = validator.New()
// register function to get tag name from json tags.
validate.RegisterTagNameFunc(func(fld reflect.StructField) string {
name := strings.SplitN(fld.Tag.Get("json"), ",", 2)[0]
if name == "-" {
return ""
}
return name
})
// register validation for 'User'
// NOTE: only have to register a non-pointer type for 'User', validator
// interanlly dereferences during it's type checks.
@ -48,7 +59,7 @@ func main() {
FirstName: "",
LastName: "",
Age: 45,
Email: "Badger.Smith@gmail.com",
Email: "Badger.Smith@gmail",
FavouriteColor: "#000",
Addresses: []*Address{address},
}
@ -67,10 +78,10 @@ func main() {
for _, err := range err.(validator.ValidationErrors) {
fmt.Println(err.Namespace())
fmt.Println(err.Field())
fmt.Println(err.StructNamespace()) // can differ when a custom TagNameFunc is registered or
fmt.Println(err.StructField()) // by passing alt name to ReportError like below
fmt.Println(err.Namespace()) // can differ when a custom TagNameFunc is registered or
fmt.Println(err.Field()) // by passing alt name to ReportError like below
fmt.Println(err.StructNamespace())
fmt.Println(err.StructField())
fmt.Println(err.Tag())
fmt.Println(err.ActualTag())
fmt.Println(err.Kind())
@ -101,8 +112,8 @@ func UserStructLevelValidation(sl validator.StructLevel) {
user := sl.Current().Interface().(User)
if len(user.FirstName) == 0 && len(user.LastName) == 0 {
sl.ReportError(user.FirstName, "FirstName", "fname", "fnameorlname", "")
sl.ReportError(user.LastName, "LastName", "lname", "fnameorlname", "")
sl.ReportError(user.FirstName, "fname", "FirstName", "fnameorlname", "")
sl.ReportError(user.LastName, "lname", "LastName", "fnameorlname", "")
}
// plus can do more, even with different tag than "fnameorlname"