Struct serde_with::NoneAsEmptyString
source · [−]pub struct NoneAsEmptyString;
Expand description
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.
The same functionality is also available as serde_with::rust::string_empty_as_none
compatible with serde’s with-annotation.
Examples
#[serde_as]
#[derive(Deserialize, Serialize)]
struct A {
#[serde_as(as = "NoneAsEmptyString")]
tags: Option<String>,
}
let v: A = serde_json::from_value(json!({ "tags": "" })).unwrap();
assert_eq!(None, v.tags);
let v: A = serde_json::from_value(json!({ "tags": "Hi" })).unwrap();
assert_eq!(Some("Hi".to_string()), v.tags);
let x = A {
tags: Some("This is text".to_string()),
};
assert_eq!(json!({ "tags": "This is text" }), serde_json::to_value(&x).unwrap());
let x = A {
tags: None,
};
assert_eq!(json!({ "tags": "" }), serde_json::to_value(&x).unwrap());
Trait Implementations
sourceimpl Clone for NoneAsEmptyString
impl Clone for NoneAsEmptyString
sourcefn clone(&self) -> NoneAsEmptyString
fn clone(&self) -> NoneAsEmptyString
Returns a copy of the value. Read more
1.0.0 · sourcefn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
sourceimpl Debug for NoneAsEmptyString
impl Debug for NoneAsEmptyString
sourceimpl Default for NoneAsEmptyString
impl Default for NoneAsEmptyString
sourcefn default() -> NoneAsEmptyString
fn default() -> NoneAsEmptyString
Returns the “default value” for a type. Read more
sourceimpl<'de, Str> DeserializeAs<'de, Option<Str>> for NoneAsEmptyString where
Str: FromStr,
Str::Err: Display,
impl<'de, Str> DeserializeAs<'de, Option<Str>> for NoneAsEmptyString where
Str: FromStr,
Str::Err: Display,
sourcefn deserialize_as<D>(deserializer: D) -> Result<Option<Str>, D::Error> where
D: Deserializer<'de>,
fn deserialize_as<D>(deserializer: D) -> Result<Option<Str>, D::Error> where
D: Deserializer<'de>,
Deserialize this value from the given Serde deserializer.
sourceimpl<AsRefStr> SerializeAs<Option<AsRefStr>> for NoneAsEmptyString where
AsRefStr: AsRef<str>,
impl<AsRefStr> SerializeAs<Option<AsRefStr>> for NoneAsEmptyString where
AsRefStr: AsRef<str>,
sourcefn serialize_as<S>(
source: &Option<AsRefStr>,
serializer: S
) -> Result<S::Ok, S::Error> where
S: Serializer,
fn serialize_as<S>(
source: &Option<AsRefStr>,
serializer: S
) -> Result<S::Ok, S::Error> where
S: Serializer,
Serialize this value into the given Serde serializer.
impl Copy for NoneAsEmptyString
Auto Trait Implementations
impl RefUnwindSafe for NoneAsEmptyString
impl Send for NoneAsEmptyString
impl Sync for NoneAsEmptyString
impl Unpin for NoneAsEmptyString
impl UnwindSafe for NoneAsEmptyString
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more