package utils import ( "fmt" "github.com/fatih/structs" "reflect" "strconv" ) func ApplyDefaultValues(struct_ interface{}) (err error) { o := structs.New(struct_) for _, field := range o.Fields() { defaultValue := field.Tag("default") if defaultValue == "" { continue } var val interface{} switch field.Kind() { case reflect.String: val = defaultValue case reflect.Bool: if defaultValue == "true" { val = true } else if defaultValue == "false" { val = false } else { return fmt.Errorf("invalid bool expression: %v, use true/false", defaultValue) } case reflect.Int: val, err = strconv.Atoi(defaultValue) if err != nil { return err } default: val = field.Value() } field.Set(val) } return nil }