May I add custom my validator rule ?

[aloha1003]

I want to add some custom validator rule base on your validator
How can I do to add custom rule ?

[renatosuero]

Hi @aloha1003 , in the readme there is a example how to use custom validators.

Custom validators

It is possible to define custom validators by using SetValidationFunc. First, one needs to create a validation function.

// Very simple validator
func notZZ(v interface{}, param string) error {
	st := reflect.ValueOf(v)
	if st.Kind() != reflect.String {
		return errors.New("notZZ only validates strings")
	}
	if st.String() == "ZZ" {
		return errors.New("value cannot be ZZ")
	}
	return nil
}

Then one needs to add it to the list of validators and give it a "tag" name.

validator.SetValidationFunc("notzz", notZZ)

Then it is possible to use the notzz validation tag. This will print "Field A error: value cannot be ZZ"

type T struct {
	A string  `validate:"nonzero,notzz"`
}
t := T{"ZZ"}
if errs := validator.Validate(t); errs != nil {
	fmt.Printf("Field A error: %s\n", errs["A"][0])
}