[−][src]Struct serde_with::NoneAsEmptyString
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
impl Clone for NoneAsEmptyString
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pub fn clone(&self) -> NoneAsEmptyString
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pub fn clone_from(&mut self, source: &Self)
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impl Copy for NoneAsEmptyString
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impl Debug for NoneAsEmptyString
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impl Default for NoneAsEmptyString
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pub fn default() -> NoneAsEmptyString
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impl<'de, Str> DeserializeAs<'de, Option<Str>> for NoneAsEmptyString where
Str: for<'a> From<&'a str>,
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Str: for<'a> From<&'a str>,
pub fn deserialize_as<D>(deserializer: D) -> Result<Option<Str>, D::Error> where
D: Deserializer<'de>,
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D: Deserializer<'de>,
impl<AsRefStr> SerializeAs<Option<AsRefStr>> for NoneAsEmptyString where
AsRefStr: AsRef<str>,
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AsRefStr: AsRef<str>,
pub fn serialize_as<S>(
source: &Option<AsRefStr>,
serializer: S
) -> Result<S::Ok, S::Error> where
S: Serializer,
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source: &Option<AsRefStr>,
serializer: S
) -> Result<S::Ok, S::Error> where
S: Serializer,
Auto Trait Implementations
impl RefUnwindSafe for NoneAsEmptyString
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impl Send for NoneAsEmptyString
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impl Sync for NoneAsEmptyString
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impl Unpin for NoneAsEmptyString
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impl UnwindSafe for NoneAsEmptyString
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Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
pub fn borrow_mut(&mut self) -> &mut T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
pub fn to_owned(&self) -> T
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pub fn clone_into(&self, target: &mut T)
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,