1package apiform
 2
 3import (
 4	"github.com/openai/openai-go/packages/param"
 5	"mime/multipart"
 6	"reflect"
 7)
 8
 9func (e *encoder) newRichFieldTypeEncoder(t reflect.Type, underlyingValueIdx []int) encoderFunc {
10	underlying := t.FieldByIndex(underlyingValueIdx)
11	primitiveEncoder := e.newPrimitiveTypeEncoder(underlying.Type)
12	return func(key string, value reflect.Value, writer *multipart.Writer) error {
13		if opt, ok := value.Interface().(param.Optional); ok && opt.IsPresent() {
14			return primitiveEncoder(key, value.FieldByIndex(underlyingValueIdx), writer)
15		} else if ok && opt.IsNull() {
16			return writer.WriteField(key, "null")
17		}
18		return nil
19	}
20}