@loopback/repository
Version:
Define and implement a common set of interfaces for interacting with databases
42 lines • 2.16 kB
JavaScript
;
// Copyright IBM Corp. and LoopBack contributors 2019,2020. All Rights Reserved.
// Node module: @loopback/repository
// This file is licensed under the MIT License.
// License text available at https://opensource.org/licenses/MIT
Object.defineProperty(exports, "__esModule", { value: true });
exports.createReferencesManyInclusionResolver = void 0;
const relation_helpers_1 = require("../relation.helpers");
const references_many_helpers_1 = require("./references-many.helpers");
/**
* Creates InclusionResolver for ReferencesMany relation.
* Notice that this function only generates the inclusionResolver.
* It doesn't register it for the source repository.
*
* Notice: scope field for inclusion is not supported yet
*
* @param meta - resolved ReferencesManyMetadata
* @param getTargetRepo - target repository i.e where related instances are
*/
function createReferencesManyInclusionResolver(meta, getTargetRepo) {
const relationMeta = (0, references_many_helpers_1.resolveReferencesManyMetadata)(meta);
return async function fetchIncludedModels(entities, inclusion, options) {
if (!entities.length)
return [];
const sourceKey = relationMeta.keyFrom;
const sourceMap = entities.map(e => e[sourceKey]);
const sourceIds = sourceMap.flat();
const targetKey = relationMeta.keyTo;
const dedupedSourceIds = (0, relation_helpers_1.deduplicate)(sourceIds);
const scope = typeof inclusion === 'string' ? {} : inclusion.scope;
const targetRepo = await getTargetRepo();
const targetsFound = await (0, relation_helpers_1.findByForeignKeys)(targetRepo, targetKey, dedupedSourceIds.filter(e => e), scope, options);
return sourceMap.map(chainIds => {
if (!chainIds)
return [];
const targets = (0, relation_helpers_1.flattenTargetsOfOneToOneRelation)(chainIds, targetsFound, targetKey);
return targets.filter((v) => v != null);
});
};
}
exports.createReferencesManyInclusionResolver = createReferencesManyInclusionResolver;
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