💯Go Struct and Field validation, including Cross Field, Cross Struct, Map, Slice and Array diving
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validator/examples/simple.go

166 lines
3.5 KiB

package main
import (
"errors"
"fmt"
"reflect"
sql "database/sql/driver"
"gopkg.in/bluesuncorp/validator.v6"
)
// User contains user information
type User struct {
FirstName string `validate:"required"`
LastName string `validate:"required"`
Age uint8 `validate:"gte=0,lte=130"`
Email string `validate:"required,email"`
FavouriteColor string `validate:"hexcolor|rgb|rgba"`
Addresses []*Address `validate:"required,dive,required"` // a person can have a home and cottage...
}
// Address houses a users address information
type Address struct {
Street string `validate:"required"`
City string `validate:"required"`
Planet string `validate:"required"`
Phone string `validate:"required"`
}
var validate *validator.Validate
func main() {
config := validator.Config{
TagName: "validate",
ValidationFuncs: validator.BakedInValidators,
}
validate = validator.New(config)
validateStruct()
validateField()
}
func validateStruct() {
address := &Address{
Street: "Eavesdown Docks",
Planet: "Persphone",
Phone: "none",
}
user := &User{
FirstName: "Badger",
LastName: "Smith",
Age: 135,
Email: "Badger.Smith@gmail.com",
FavouriteColor: "#000",
Addresses: []*Address{address},
}
// returns nil or ValidationErrors ( map[string]*FieldError )
errs := validate.Struct(user)
if errs != nil {
fmt.Println(errs) // output: Key: "User.Age" Error:Field validation for "Age" failed on the "lte" tag
// Key: "User.Addresses[0].City" Error:Field validation for "City" failed on the "required" tag
err := errs["User.Addresses[0].City"]
fmt.Println(err.Field) // output: City
fmt.Println(err.Tag) // output: required
fmt.Println(err.Kind) // output: string
fmt.Println(err.Type) // output: string
fmt.Println(err.Param) // output:
fmt.Println(err.Value) // output:
// from here you can create your own error messages in whatever language you wish
return
}
// save user to database
}
func validateField() {
myEmail := "joeybloggs.gmail.com"
errs := validate.Field(myEmail, "required,email")
if errs != nil {
fmt.Println(errs) // output: Key: "" Error:Field validation for "" failed on the "email" tag
return
}
// email ok, move on
}
var validate2 *validator.Validate
type valuer struct {
Name string
}
func (v valuer) Value() (sql.Value, error) {
if v.Name == "errorme" {
return nil, errors.New("some kind of error")
}
if v.Name == "blankme" {
return "", nil
}
if len(v.Name) == 0 {
return nil, nil
}
return v.Name, nil
}
// ValidateValuerType implements validator.CustomTypeFunc
func ValidateValuerType(field reflect.Value) interface{} {
if valuer, ok := field.Interface().(sql.Valuer); ok {
val, err := valuer.Value()
if err != nil {
// handle the error how you want
return nil
}
return val
}
return nil
}
func main2() {
customTypes := map[reflect.Type]validator.CustomTypeFunc{}
customTypes[reflect.TypeOf((*sql.Valuer)(nil))] = ValidateValuerType
customTypes[reflect.TypeOf(valuer{})] = ValidateValuerType
config := validator.Config{
TagName: "validate",
ValidationFuncs: validator.BakedInValidators,
CustomTypeFuncs: customTypes,
}
validate2 = validator.New(config)
validateCustomFieldType()
}
func validateCustomFieldType() {
val := valuer{
Name: "blankme",
}
errs := validate2.Field(val, "required")
if errs != nil {
fmt.Println(errs) // output: Key: "" Error:Field validation for "" failed on the "required" tag
return
}
// all ok
}