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has-many.inclusion-resolver.ts
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has-many.inclusion-resolver.ts
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// Copyright IBM Corp. 2019. All Rights Reserved.
// Node module: @loopback/repository
// This file is licensed under the MIT License.
// License text available at https://opensource.org/licenses/MIT
import {AnyObject, Options} from '../../common-types';
import {Entity} from '../../model';
import {Filter, Inclusion} from '../../query';
import {EntityCrudRepository} from '../../repositories/repository';
import {
findByForeignKeys,
flattenTargetsOfOneToManyRelation,
StringKeyOf,
} from '../relation.helpers';
import {Getter, HasManyDefinition, InclusionResolver} from '../relation.types';
import {resolveHasManyMetadata} from './has-many.helpers';
export function createHasManyInclusionResolver<
Target extends Entity,
TargetID,
TargetRelations extends object
>(
meta: HasManyDefinition,
getTargetRepo: Getter<
EntityCrudRepository<Target, TargetID, TargetRelations>
>,
): InclusionResolver {
const relationMeta = resolveHasManyMetadata(meta);
return async function fetchHasManyModels(
entities: Entity[],
inclusion: Inclusion<Entity>,
options?: Options,
): Promise<((Target & TargetRelations)[] | undefined)[]> {
if (!entities.length) return [];
const sourceKey = relationMeta.keyFrom;
const sourceIds = entities.map(e => (e as AnyObject)[sourceKey]);
const targetKey = relationMeta.keyTo as StringKeyOf<Target>;
const targetRepo = await getTargetRepo();
const targetsFound = await findByForeignKeys(
targetRepo,
targetKey,
sourceIds,
inclusion.scope as Filter<Target>,
options,
);
return flattenTargetsOfOneToManyRelation(
sourceIds,
targetsFound,
targetKey,
);
};
}