Function serialize 

pub fn serialize<T, S>(
    value: &Option<T>,
    serializer: S,
) -> Result<<S as Serializer>::Ok, <S as Serializer>::Error>
where
    T: Serialize,
    S: Serializer,

Serialize an optional value as a singleton map.

For Some(value), this serializes the value using singleton map format. For None, this serializes as null.

Examples

use noyalib::with::singleton_map_optional;
use serde::{Deserialize, Serialize};

#[derive(Debug, Serialize, Deserialize)]
enum Action {
    Start,
    Stop,
}

#[derive(Debug, Serialize, Deserialize)]
struct Command {
    #[serde(
        with = "singleton_map_optional",
        skip_serializing_if = "Option::is_none",
        default
    )]
    action: Option<Action>,
}