How can I transform a Go validator.FieldLevel.Field() to string array

Question

I have a complex object with this structure.

type People struct {
    Objectives    []string  `validate:"required,ValidateCustom" json:"Objectives"`
}

And I need to test the list thinking in a enum, using gopkg.in/go-playground/validator.v9:

//ValidateCustom -- ValidateCustom
func ValidateCustom(field validator.FieldLevel) bool {
    switch strings.ToUpper(field.Field().String()) {
    case "emumA":
    case "enumB":
        return true
    default:
        return false
    }
}

This example uses a idea of string but how can I build to []string to iterate?

Answer 1

I founded the answer... using slice and Interface

//ValidateCustom -- ValidateCustom
func ValidateCustom(field validator.FieldLevel) bool {
  inter := field.Field()
  slice, ok := inter.Interface().([]string)
  if !ok {
      return false
  }
  for _, v := range slice {
      switch strings.ToUpper(v) {
         case "enumA":
         case "enumB":
           return true
         default:
           return false
     }
}