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- package main
- import (
- "fmt"
- "gopkg.in/go-playground/validator.v9"
- )
- // 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:"iscolor"` // alias for 'hexcolor|rgb|rgba|hsl|hsla'
- 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"`
- }
- // use a single instance of Validate, it caches struct info
- var validate *validator.Validate
- func main() {
- validate = validator.New()
- validateStruct()
- validateVariable()
- }
- 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 ( []FieldError )
- err := validate.Struct(user)
- if err != nil {
- // this check is only needed when your code could produce
- // an invalid value for validation such as interface with nil
- // value most including myself do not usually have code like this.
- if _, ok := err.(*validator.InvalidValidationError); ok {
- fmt.Println(err)
- return
- }
- 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.Tag())
- fmt.Println(err.ActualTag())
- fmt.Println(err.Kind())
- fmt.Println(err.Type())
- fmt.Println(err.Value())
- fmt.Println(err.Param())
- fmt.Println()
- }
- // from here you can create your own error messages in whatever language you wish
- return
- }
- // save user to database
- }
- func validateVariable() {
- myEmail := "joeybloggs.gmail.com"
- errs := validate.Var(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
- }
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