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RelationLoader

shaperail_runtime::graphql

Struct RelationLoader 

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pub struct RelationLoader { /* private fields */ }
Expand description

Batched relation loader. Caches results per request to prevent N+1 queries.

Thread-safe via Mutex — shared across all resolvers in a single request.

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impl RelationLoader

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pub fn new(state: Arc<AppState>, resources: Vec<ResourceDefinition>) -> Self

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pub async fn load_by_id( &self, resource_name: &str, id: &Uuid, ) -> Result<Option<ResourceRow>, ShaperailError>

Load a single record by ID (belongs_to). Uses cache to avoid duplicate queries.

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pub async fn load_by_filter( &self, resource_name: &str, filter_field: &str, filter_value: &str, ) -> Result<Vec<ResourceRow>, ShaperailError>

Load related records by a filter field (has_many/has_one). Results are cached per (resource, field, value) triple.

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pub async fn cache_size(&self) -> usize

Returns the number of cached entries (for testing N+1 prevention).

Trait Implementations§

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impl Clone for RelationLoader

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fn clone(&self) -> RelationLoader

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<T> Conv for T

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fn conv<T>(self) -> T
where Self: Into<T>,

Converts self into T using Into<T>. Read more
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impl<T> FmtForward for T

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fn fmt_binary(self) -> FmtBinary<Self>
where Self: Binary,

Causes self to use its Binary implementation when Debug-formatted.
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fn fmt_display(self) -> FmtDisplay<Self>
where Self: Display,

Causes self to use its Display implementation when Debug-formatted.
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fn fmt_lower_exp(self) -> FmtLowerExp<Self>
where Self: LowerExp,

Causes self to use its LowerExp implementation when Debug-formatted.
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fn fmt_lower_hex(self) -> FmtLowerHex<Self>
where Self: LowerHex,

Causes self to use its LowerHex implementation when Debug-formatted.
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fn fmt_octal(self) -> FmtOctal<Self>
where Self: Octal,

Causes self to use its Octal implementation when Debug-formatted.
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fn fmt_pointer(self) -> FmtPointer<Self>
where Self: Pointer,

Causes self to use its Pointer implementation when Debug-formatted.
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where Self: UpperExp,

Causes self to use its UpperExp implementation when Debug-formatted.
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where Self: UpperHex,

Causes self to use its UpperHex implementation when Debug-formatted.
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fn fmt_list(self) -> FmtList<Self>
where &'a Self: for<'a> IntoIterator,

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impl<T> From<T> for T

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fn from(t: T) -> T

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where T: Clone,

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fn from_ref(input: &T) -> T

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fn instrument(self, span: Span) -> Instrumented<Self>

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Calls U::from(self).

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_request(self) -> Request<T>

Wrap the input message T in a tonic::Request
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fn into_request(self) -> Request<T>

Wrap the input message T in a tonic::Request
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fn named_layer<S>(&self, service: S) -> Layered<<L as Layer<S>>::Service, S>
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fn pipe<R>(self, func: impl FnOnce(Self) -> R) -> R
where Self: Sized,

Pipes by value. This is generally the method you want to use. Read more
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where R: 'a,

Borrows self and passes that borrow into the pipe function. Read more
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where R: 'a,

Mutably borrows self and passes that borrow into the pipe function. Read more
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where Self: Borrow<B>, B: 'a + ?Sized, R: 'a,

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where Self: BorrowMut<B>, B: 'a + ?Sized, R: 'a,

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const ALIGN: usize

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type Init = T

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fn tap(self, func: impl FnOnce(&Self)) -> Self

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fn tap_mut(self, func: impl FnOnce(&mut Self)) -> Self

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where Self: Deref<Target = T>, T: ?Sized,

Calls .tap_deref() only in debug builds, and is erased in release builds.
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type Owned = T

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