Struct MapAsPairs 

pub struct MapAsPairs<KA = Same, VA = Same>(/* private fields */);

A map that is written as a sequence of key and value pairs.

When serializing, the entries are written as a sequence of pairs ([["a", 1], ["b", 2]]). This is useful for maps whose keys cannot be keys in the format, like tuples or structs in JSON. When deserializing, a sequence of pairs and a map are accepted. The keys are deserialized with the adapter KA and the values with VA (both Same by default). Keys that are given more than once are handled like in maps (see DuplicateKeys).

Supported are BTreeMap<K, V> and HashMap<K, V>.

use std::collections::BTreeMap;
use deser::adapters::MapAsPairs;
use deser::{Deserialize, Serialize};

#[derive(Serialize, Deserialize)]
pub struct Grid {
    #[deser(as = MapAsPairs)]
    cells: BTreeMap<(u32, u32), String>,
}

let grid: Grid = deser_json::from_str(r#"{"cells": [[[0, 1], "x"]]}"#).unwrap();
assert_eq!(grid.cells[&(0, 1)], "x");
assert_eq!(
    deser_json::to_string(&grid).unwrap(),
    r#"{"cells":[[[0,1],"x"]]}"#
);

Trait Implementations

impl<'de, K: Ord + Send, V: Send, KA: Deserialize<'de, K>, VA: Deserialize<'de, V>> Deserialize<'de, BTreeMap<K, V>> for MapAsPairs<KA, VA>

fn deserialize_into<'out>( out: &'out mut Option<BTreeMap<K, V>>, 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 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 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_update<'out>( value: &'out mut T, state: &mut State, ) -> SinkHandle<'out, 'de>

Creates a sink that updates an existing value.

impl<'de, K: Hash + Eq + Send, V: Send, H: BuildHasher + Default + Send, KA: Deserialize<'de, K>, VA: Deserialize<'de, V>> Deserialize<'de, HashMap<K, V, H>> for MapAsPairs<KA, VA>

fn deserialize_into<'out>( out: &'out mut Option<HashMap<K, V, H>>, 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 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 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_update<'out>( value: &'out mut T, state: &mut State, ) -> SinkHandle<'out, 'de>

Creates a sink that updates an existing value.

impl<K: Sync, V: Sync, KA: Serialize<K>, VA: Serialize<V>> Serialize<BTreeMap<K, V>> for MapAsPairs<KA, VA>

fn serialize<'a>( value: &'a BTreeMap<K, V>, state: &mut State, ) -> Result<Emit<'a>, Error>

Serializes the value.

fn container_shape(value: &BTreeMap<K, V>) -> ContainerShape

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

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

Describes the Rust shape of the value.

impl<K: Sync, V: Sync, H: BuildHasher + Sync, KA: Serialize<K>, VA: Serialize<V>> Serialize<HashMap<K, V, H>> for MapAsPairs<KA, VA>

fn serialize<'a>( value: &'a HashMap<K, V, H>, state: &mut State, ) -> Result<Emit<'a>, Error>

Serializes the value.

fn container_shape(value: &HashMap<K, V, H>) -> ContainerShape

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

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

Describes the Rust shape of the value.