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101 lines
2.5 KiB
101 lines
2.5 KiB
package main
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import (
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"fmt"
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"gopkg.in/go-playground/validator.v9"
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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:"iscolor"` // alias for 'hexcolor|rgb|rgba|hsl|hsla'
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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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// use a single instance of Validate, it caches struct info
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var validate *validator.Validate
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func main() {
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validate = validator.New()
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validateStruct()
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validateVariable()
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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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err := validate.Struct(user)
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if err != nil {
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// this check is only needed when your code could produce
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// an invalid value for validation such as interface with nil
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// value most including myself do not usually have code like this.
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if _, ok := err.(*validator.InvalidValidationError); ok {
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fmt.Println(err)
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return
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}
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for _, err := range err.(validator.ValidationErrors) {
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fmt.Println(err.Namespace())
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fmt.Println(err.Field())
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fmt.Println(err.StructNamespace()) // can differ when a custom TagNameFunc is registered or
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fmt.Println(err.StructField()) // by passing alt name to ReportError like below
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fmt.Println(err.Tag())
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fmt.Println(err.ActualTag())
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fmt.Println(err.Kind())
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fmt.Println(err.Type())
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fmt.Println(err.Value())
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fmt.Println(err.Param())
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fmt.Println()
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}
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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 validateVariable() {
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myEmail := "joeybloggs.gmail.com"
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errs := validate.Var(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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