Enum NullablePatch 

pub enum NullablePatch<T> {
    Absent,
    Null,
    Value(T),
}

Three-state nullable field used by PATCH-style request DTOs.

Absent means the request omitted the field and the existing value should be preserved. Null means the request explicitly supplied null and the existing value should be cleared. Value means the request supplied a concrete replacement value.

Variants

Absent

Field was omitted from the request.

Null

Field was present with JSON null.

Value(T)

Field was present with a concrete value.

Implementations

impl<T> NullablePatch<T>

pub fn is_present(&self) -> bool

Returns whether the request supplied this field as either null or a concrete value.

Trait Implementations

impl<T: Clone> Clone for NullablePatch<T>

fn clone(&self) -> NullablePatch<T>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T: Debug> Debug for NullablePatch<T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T> Default for NullablePatch<T>

fn default() -> NullablePatch<T>

Returns the “default value” for a type.

impl<'de, T> Deserialize<'de> for NullablePatch<T>

where T: Deserialize<'de>,

fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>

where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl<T> From<Option<T>> for NullablePatch<T>

fn from(value: Option<T>) -> Self

Converts to this type from the input type.

impl<T: PartialEq> PartialEq for NullablePatch<T>

fn eq(&self, other: &NullablePatch<T>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T: Copy> Copy for NullablePatch<T>

impl<T: Eq> Eq for NullablePatch<T>

impl<T> StructuralPartialEq for NullablePatch<T>