Struct MappedQuery 

pub struct MappedQuery<Q, F> { /* private fields */ }

A serializable query with a typed projection of its validated answers.

Trait Implementations

impl<Q: Clone, F: Clone> Clone for MappedQuery<Q, F>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<Q: Debug, F: Debug> Debug for MappedQuery<Q, F>

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

Formats the value using the given formatter.

impl<Q: Query, F, A> Query for MappedQuery<Q, F>

where F: Fn(Q::Output) -> A + WasmCompatSend + WasmCompatSync,

type Response = <Q as Query>::Response

The intermediate response shape deserialized by Serde.

type Output = A

The validated application answer shape.

fn decode(&self, response: Self::Response) -> Result<A, ProviderError>

Validate and convert a deserialized response. Composite queries delegate to their fields, keeping validation inside the evaluation error boundary.

fn named(self, id: impl Into<String>) -> Result<NamedQuery<Self>, ProviderError>

where Self: Sized,

Give a standalone question a runtime ID. Named struct fields do not need this.

fn join<Q: Query>(self, other: Q) -> JoinedQuery<Self, Q>

where Self: Sized,

Flatten two object-shaped queries into one evaluation request. Duplicate IDs are rejected before sending the request. Child queries must serialize with stable field names: decoding uses those names to partition the response before delegating to each child.

fn map<A, F>(self, map: F) -> MappedQuery<Self, F>

where Self: Sized, F: Fn(Self::Output) -> A + WasmCompatSend + WasmCompatSync,

Project validated answers into an application value.

impl<Q, F> Serialize for MappedQuery<Q, F>

where Q: Serialize,

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.