156 lines
3.3 KiB
Go
156 lines
3.3 KiB
Go
package main
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import (
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"errors"
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"fmt"
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"reflect"
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sql "database/sql/driver"
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"gopkg.in/go-playground/validator.v8"
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)
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// User contains user information
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type User struct {
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FirstName string `validate:"required"`
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LastName string `validate:"required"`
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Age uint8 `validate:"gte=0,lte=130"`
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Email string `validate:"required,email"`
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FavouriteColor string `validate:"hexcolor|rgb|rgba"`
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Addresses []*Address `validate:"required,dive,required"` // a person can have a home and cottage...
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}
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// Address houses a users address information
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type Address struct {
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Street string `validate:"required"`
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City string `validate:"required"`
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Planet string `validate:"required"`
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Phone string `validate:"required"`
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}
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var validate *validator.Validate
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func main() {
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config := &validator.Config{TagName: "validate"}
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validate = validator.New(config)
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validateStruct()
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validateField()
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}
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func validateStruct() {
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address := &Address{
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Street: "Eavesdown Docks",
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Planet: "Persphone",
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Phone: "none",
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}
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user := &User{
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FirstName: "Badger",
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LastName: "Smith",
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Age: 135,
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Email: "Badger.Smith@gmail.com",
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FavouriteColor: "#000",
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Addresses: []*Address{address},
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}
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// returns nil or ValidationErrors ( map[string]*FieldError )
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errs := validate.Struct(user)
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if errs != nil {
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fmt.Println(errs) // output: Key: "User.Age" Error:Field validation for "Age" failed on the "lte" tag
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// Key: "User.Addresses[0].City" Error:Field validation for "City" failed on the "required" tag
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err := errs.(validator.ValidationErrors)["User.Addresses[0].City"]
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fmt.Println(err.Field) // output: City
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fmt.Println(err.Tag) // output: required
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fmt.Println(err.Kind) // output: string
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fmt.Println(err.Type) // output: string
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fmt.Println(err.Param) // output:
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fmt.Println(err.Value) // output:
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// from here you can create your own error messages in whatever language you wish
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return
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}
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// save user to database
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}
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func validateField() {
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myEmail := "joeybloggs.gmail.com"
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errs := validate.Field(myEmail, "required,email")
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if errs != nil {
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fmt.Println(errs) // output: Key: "" Error:Field validation for "" failed on the "email" tag
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return
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}
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// email ok, move on
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}
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var validate2 *validator.Validate
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type valuer struct {
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Name string
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}
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func (v valuer) Value() (sql.Value, error) {
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if v.Name == "errorme" {
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return nil, errors.New("some kind of error")
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}
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if v.Name == "blankme" {
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return "", nil
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}
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if len(v.Name) == 0 {
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return nil, nil
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}
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return v.Name, nil
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}
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// ValidateValuerType implements validator.CustomTypeFunc
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func ValidateValuerType(field reflect.Value) interface{} {
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if valuer, ok := field.Interface().(sql.Valuer); ok {
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val, err := valuer.Value()
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if err != nil {
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// handle the error how you want
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return nil
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}
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return val
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}
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return nil
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}
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func main2() {
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config := &validator.Config{TagName: "validate"}
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validate2 = validator.New(config)
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validate2.RegisterCustomTypeFunc(ValidateValuerType, (*sql.Valuer)(nil), valuer{})
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validateCustomFieldType()
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}
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func validateCustomFieldType() {
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val := valuer{
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Name: "blankme",
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}
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errs := validate2.Field(val, "required")
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if errs != nil {
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fmt.Println(errs) // output: Key: "" Error:Field validation for "" failed on the "required" tag
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return
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}
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// all ok
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}
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