Enum Undefinable 

pub enum Undefinable<T> {
    Undefined,
    Null,
    Value(T),
}

GraphQL nullable-input tri-state: absent (leave unchanged) / null (clear) / value (set).

Input convention across this crate: create inputs use Option<T> with #[serde(skip_serializing_if = "Option::is_none")] (absent-when-None); update inputs use Undefinable<T> for clearable fields, with #[serde(skip_serializing_if = "Undefinable::is_undefined", default)] and #[builder(default, into)].

Variants

Undefined

Field is omitted from the request: leave unchanged.

Null

Field is sent as null: clear the value.

Value(T)

Field is sent with a concrete value: set it.

Implementations

impl<T> Undefinable<T>

pub fn is_undefined(&self) -> bool

true when the field should be omitted from serialization entirely.

Trait Implementations

impl<T: Clone> Clone for Undefinable<T>

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

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for Undefinable<T>

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

Formats the value using the given formatter.

impl<T> Default for Undefinable<T>

fn default() -> Undefinable<T>

Returns the “default value” for a type.

impl<T> From<T> for Undefinable<T>

fn from(value: T) -> Self

Converts to this type from the input type.

impl<T: PartialEq> PartialEq for Undefinable<T>

fn eq(&self, other: &Undefinable<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: Serialize> Serialize for Undefinable<T>

fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error>

Serialize this value into the given Serde serializer.

impl<T: PartialEq> StructuralPartialEq for Undefinable<T>