Struct DefaultOnError 

pub struct DefaultOnError<A = Same>(/* private fields */);

Uses the Default if a value cannot be deserialized.

The value is deserialized with the adapter A (by default Same). If that fails, the default value is used instead and the rest of the value is skipped (see Sink::recover). Only errors of the value are handled, errors of the data format and of layers (such as Limits) still fail the deserialization. Missing values are handled by the inner adapter. Serialization uses the inner adapter.

use deser::Deserialize;
use deser::adapters::DefaultOnError;

#[derive(Deserialize)]
pub enum Kind {
    A,
    B,
}

#[derive(Deserialize)]
pub struct Item {
    // unknown kinds become `None`
    #[deser(as = DefaultOnError)]
    kind: Option<Kind>,
}

Trait Implementations

impl<'de, T: Default + Send, A: Deserialize<'de, T>> Deserialize<'de, T> for DefaultOnError<A>

fn deserialize_into<'out>( out: &'out mut Option<T>, state: &mut State, ) -> SinkHandle<'out, 'de>

Creates a sink that deserializes the value into the given slot.

fn expecting() -> Cow<'static, str>

Returns what the value expects, for error messages.

fn describe_type(d: &mut dyn Describe)

Describes the Rust shape of the type.

fn initial_value() -> Option<T>

Provides the value of a missing struct field.

fn deserialize_atom( slot: &mut Slot<T, Self>, atom: Atom<'_>, state: &mut State, ) -> Result<(), Error>

Deserializes an atom into the slot.

fn deserialize_borrowed_atom( slot: &mut Slot<T, Self>, atom: Atom<'de>, state: &mut State, ) -> Result<(), Error>

Deserializes an atom that borrows from the data being deserialized into the slot.

fn deserialize_update<'out>( value: &'out mut T, state: &mut State, ) -> SinkHandle<'out, 'de>

Creates a sink that updates an existing value.

impl<T: ?Sized, A: Serialize<T>> Serialize<T> for DefaultOnError<A>

fn serialize<'a>(value: &'a T, state: &mut State) -> Result<Emit<'a>, Error>

Serializes the value.

fn finish(value: &T, state: &mut State) -> Result<(), Error>

Invoked after the serialization finished.

fn is_optional(value: &T) -> bool

Checks if the value represents an optional value.

fn container_shape(value: &T) -> ContainerShape

Returns the shape of the value if it’s a map or sequence.

fn describe(value: &T, d: &mut dyn Describe)

Describes the Rust shape of the value.