copyStruct.go

// assign Copy one struct into another of same type
// Accepts pointer to struct
func assign(t interface{}, t2 interface{}) {
	s := reflect.ValueOf(t)
	s2 := reflect.ValueOf(t2)

	if s.Kind() == reflect.Ptr {
		s = reflect.Indirect(s)
	}

	if s2.Kind() == reflect.Ptr {
		s2 = reflect.Indirect(s2)
	}

	if s.Kind() != reflect.Struct || s2.Kind() != reflect.Struct {
		log.Fatal("unexpected type 1")
	}

	num := s.NumField()

	for i := 0; i < num; i++ {
		f := s.Field(i)
		f2 := s2.Field(i)

		if reflect.Value(f).String() != "" && f.CanSet() {
			f2.Set(reflect.Value(f))
		}
	}
}