Struct RelationLoader 

pub struct RelationLoader<E: QueryEngine> { /* private fields */ }

Relation loader for executing relation queries.

Implementations

impl<E: QueryEngine> RelationLoader<E>

pub fn new(engine: E) -> Self

Create a new relation loader.

pub fn with_strategy(self, strategy: RelationLoadStrategy) -> Self

Set the loading strategy.

pub fn with_batch_size(self, size: usize) -> Self

Set the batch size for separate queries.

pub fn engine(&self) -> &E

Get the engine.

pub fn build_one_to_many_query( &self, spec: &RelationSpec, include: &IncludeSpec, parent_ids: &[FilterValue], ) -> (String, Vec<FilterValue>)

Build a query for loading a one-to-many relation.

pub fn build_many_to_one_query( &self, spec: &RelationSpec, child_foreign_keys: &[FilterValue], ) -> (String, Vec<FilterValue>)

Build a query for loading a many-to-one relation.

pub fn build_many_to_many_query( &self, spec: &RelationSpec, include: &IncludeSpec, parent_ids: &[FilterValue], ) -> (String, Vec<FilterValue>)

Build a query for loading a many-to-many relation.

Trait Implementations

impl<E: QueryEngine + Clone> Clone for RelationLoader<E>

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.