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{ Subject } from \"./Subject\"\nimport { ObjectLiteral } from \"../common/ObjectLiteral\"\nimport { QueryRunner } from \"../query-runner/QueryRunner\"\nimport { FindManyOptions } from \"../find-options/FindManyOptions\"\nimport { MongoRepository } from \"../repository/MongoRepository\"\n\n/**\n * Loads database entities for all operate subjects which do not have database entity set.\n * All entities that we load database entities for are marked as updated or inserted.\n * To understand which of them really needs to be inserted or updated we need to load\n * their original representations from the database.\n */\nexport class SubjectDatabaseEntityLoader {\n    // ---------------------------------------------------------------------\n    // Constructor\n    // ---------------------------------------------------------------------\n\n    constructor(\n        protected queryRunner: QueryRunner,\n        protected subjects: Subject[],\n    ) {}\n\n    // ---------------------------------------------------------------------\n    // Public Methods\n    // ---------------------------------------------------------------------\n\n    /**\n     * Loads database entities for all subjects.\n     *\n     * loadAllRelations flag is used to load all relation ids of the object, no matter if they present in subject entity or not.\n     * This option is used for deletion.\n     */\n    async load(\n        operationType: \"save\" | \"remove\" | \"soft-remove\" | \"recover\",\n    ): Promise<void> {\n        // we are grouping subjects by target to perform more optimized queries using WHERE IN operator\n        // go through the groups and perform loading of database entities of each subject in the group\n        const promises = this.groupByEntityTargets().map(\n            async (subjectGroup) => {\n                // prepare entity ids of the subjects we need to load\n                const allIds: ObjectLiteral[] = []\n                const allSubjects: Subject[] = []\n                subjectGroup.subjects.forEach((subject) => {\n                    // we don't load if subject already has a database entity loaded\n                    if (subject.databaseEntity || !subject.identifier) return\n\n                    allIds.push(subject.identifier)\n                    allSubjects.push(subject)\n                })\n\n                // if there no ids found (means all entities are new and have generated ids) - then nothing to load there\n                if (!allIds.length) return\n\n                const loadRelationPropertyPaths: string[] = []\n\n                // for the save, soft-remove and recover operation\n                // extract all property paths of the relations we need to load relation ids for\n                // this is for optimization purpose - this way we don't load relation ids for entities\n                // whose relations are undefined, and since they are undefined its really pointless to\n                // load something for them, since undefined properties are skipped by the orm\n                if (\n                    operationType === \"save\" ||\n                    operationType === \"soft-remove\" ||\n                    operationType === \"recover\"\n                ) {\n                    subjectGroup.subjects.forEach((subject) => {\n                        // gets all relation property paths that exist in the persisted entity.\n                        subject.metadata.relations.forEach((relation) => {\n                            const value = relation.getEntityValue(\n                                subject.entityWithFulfilledIds!,\n                            )\n                            if (value === undefined) return\n\n                            if (\n                                loadRelationPropertyPaths.indexOf(\n                                    relation.propertyPath,\n                                ) === -1\n                            )\n                                loadRelationPropertyPaths.push(\n                                    relation.propertyPath,\n                                )\n                        })\n                    })\n                } else {\n                    // remove\n\n                    // for remove operation\n                    // we only need to load junction relation ids since only they are removed by cascades\n                    loadRelationPropertyPaths.push(\n                        ...subjectGroup.subjects[0].metadata.manyToManyRelations.map(\n                            (relation) => relation.propertyPath,\n                        ),\n                    )\n                }\n\n                const findOptions: FindManyOptions<any> = {\n                    loadEagerRelations: false,\n                    loadRelationIds: {\n                        relations: loadRelationPropertyPaths,\n                        disableMixedMap: true,\n                    },\n                    // the soft-deleted entities should be included in the loaded entities for recover operation\n                    withDeleted: true,\n                }\n\n                // load database entities for all given ids\n                let entities: any[] = []\n                if (\n                    this.queryRunner.connection.driver.options.type ===\n                    \"mongodb\"\n                ) {\n                    const mongoRepo =\n                        this.queryRunner.manager.getRepository<ObjectLiteral>(\n                            subjectGroup.target,\n                        ) as MongoRepository<ObjectLiteral>\n                    entities = await mongoRepo.findByIds(allIds, findOptions)\n                } else {\n                    entities = await this.queryRunner.manager\n                        .getRepository<ObjectLiteral>(subjectGroup.target)\n                        .createQueryBuilder()\n                        .setFindOptions(findOptions)\n                        .whereInIds(allIds)\n                        .getMany()\n                }\n\n                // now when we have entities we need to find subject of each entity\n                // and insert that entity into database entity of the found subjects\n                entities.forEach((entity) => {\n                    const subjects = this.findByPersistEntityLike(\n                        subjectGroup.target,\n                        entity,\n                    )\n                    subjects.forEach((subject) => {\n                        subject.databaseEntity = entity\n                        if (!subject.identifier)\n                            subject.identifier =\n                                subject.metadata.hasAllPrimaryKeys(entity)\n                                    ? subject.metadata.getEntityIdMap(entity)\n                                    : undefined\n                    })\n                })\n\n                // this way we tell what subjects we tried to load database entities of\n                for (let subject of allSubjects) {\n                    subject.databaseEntityLoaded = true\n                }\n            },\n        )\n\n        await Promise.all(promises)\n    }\n\n    // ---------------------------------------------------------------------\n    // Protected Methods\n    // ---------------------------------------------------------------------\n\n    /**\n     * Finds subjects where entity like given subject's entity.\n     * Comparison made by entity id.\n     * Multiple subjects may be returned if duplicates are present in the subject array.\n     * This will likely result in the same row being updated multiple times during a transaction.\n     */\n    protected findByPersistEntityLike(\n        entityTarget: Function | string,\n        entity: ObjectLiteral,\n    ): Subject[] {\n        return this.subjects.filter((subject) => {\n            if (!subject.entity) return false\n\n            if (subject.entity === entity) return true\n\n            return (\n                subject.metadata.target === entityTarget &&\n                subject.metadata.compareEntities(\n                    subject.entityWithFulfilledIds!,\n                    entity,\n                )\n            )\n        })\n    }\n\n    /**\n     * Groups given Subject objects into groups separated by entity targets.\n     */\n    protected groupByEntityTargets(): {\n        target: Function | string\n        subjects: Subject[]\n    }[] {\n        return this.subjects.reduce((groups, operatedEntity) => {\n            let group = groups.find(\n                (group) => group.target === operatedEntity.metadata.target,\n            )\n            if (!group) {\n                group = { target: operatedEntity.metadata.target, subjects: [] }\n                groups.push(group)\n            }\n            group.subjects.push(operatedEntity)\n            return groups\n        }, [] as { target: Function | string; subjects: Subject[] }[])\n    }\n}\n"],"sourceRoot":".."}