Module serde_with::rust::string_empty_as_none

De/Serialize a Option<String> type while transforming the empty string to None

Convert an Option<T> from/to string using FromStr and AsRef<str> implementations. An empty string is deserialized as None and a None vice versa.

Examples

#[derive(Deserialize, Serialize)]
struct A {
    #[serde(with = "serde_with::rust::string_empty_as_none")]
    tags: Option<String>,
}

let v: A = serde_json::from_str(r##"{
    "tags": ""
}"##).unwrap();
assert!(v.tags.is_none());

let v: A = serde_json::from_str(r##"{
    "tags": "Hi"
}"##).unwrap();
assert_eq!(Some("Hi".to_string()), v.tags);

let x = A {
    tags: Some("This is text".to_string()),
};
assert_eq!(r#"{"tags":"This is text"}"#, serde_json::to_string(&x).unwrap());

let x = A {
    tags: None,
};
assert_eq!(r#"{"tags":""}"#, serde_json::to_string(&x).unwrap());

Functions

deserialize	Deserialize an Option<T> from a string using FromStr
serialize	Serialize a string from Option<T> using AsRef<str> or using the empty string if None.