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{ DataSource } from \"../data-source/DataSource\"\nimport { ObjectLiteral } from \"../common/ObjectLiteral\"\nimport { QueryRunner } from \"../query-runner/QueryRunner\"\nimport { RelationMetadata } from \"../metadata/RelationMetadata\"\nimport { FindOptionsUtils } from \"../find-options/FindOptionsUtils\"\nimport { SelectQueryBuilder } from \"./SelectQueryBuilder\"\n\n/**\n * Wraps entities and creates getters/setters for their relations\n * to be able to lazily load relations when accessing these relations.\n */\nexport class RelationLoader {\n // -------------------------------------------------------------------------\n // Constructor\n // -------------------------------------------------------------------------\n\n constructor(private connection: DataSource) {}\n\n // -------------------------------------------------------------------------\n // Public Methods\n // -------------------------------------------------------------------------\n\n /**\n * Loads relation data for the given entity and its relation.\n */\n load(\n relation: RelationMetadata,\n entityOrEntities: ObjectLiteral | ObjectLiteral[],\n queryRunner?: QueryRunner,\n queryBuilder?: SelectQueryBuilder,\n ): Promise {\n // todo: check all places where it uses non array\n if (queryRunner && queryRunner.isReleased) queryRunner = undefined // get new one if already closed\n if (relation.isManyToOne || relation.isOneToOneOwner) {\n return this.loadManyToOneOrOneToOneOwner(\n relation,\n entityOrEntities,\n queryRunner,\n queryBuilder,\n )\n } else if (relation.isOneToMany || relation.isOneToOneNotOwner) {\n return this.loadOneToManyOrOneToOneNotOwner(\n relation,\n entityOrEntities,\n queryRunner,\n queryBuilder,\n )\n } else if (relation.isManyToManyOwner) {\n return this.loadManyToManyOwner(\n relation,\n entityOrEntities,\n queryRunner,\n queryBuilder,\n )\n } else {\n // many-to-many non owner\n return this.loadManyToManyNotOwner(\n relation,\n entityOrEntities,\n queryRunner,\n queryBuilder,\n )\n }\n }\n\n /**\n * Loads data for many-to-one and one-to-one owner relations.\n *\n * (ow) post.category<=>category.post\n * loaded: category from post\n * example: SELECT category.id AS category_id, category.name AS category_name FROM category category\n * INNER JOIN post Post ON Post.category=category.id WHERE Post.id=1\n */\n loadManyToOneOrOneToOneOwner(\n relation: RelationMetadata,\n entityOrEntities: ObjectLiteral | ObjectLiteral[],\n queryRunner?: QueryRunner,\n queryBuilder?: SelectQueryBuilder,\n ): Promise {\n const entities = Array.isArray(entityOrEntities)\n ? entityOrEntities\n : [entityOrEntities]\n\n const joinAliasName = relation.entityMetadata.name\n const qb = queryBuilder\n ? queryBuilder\n : this.connection\n .createQueryBuilder(queryRunner)\n .select(relation.propertyName) // category\n .from(relation.type, relation.propertyName)\n\n const mainAlias = qb.expressionMap.mainAlias!.name\n const columns = relation.entityMetadata.primaryColumns\n const joinColumns = relation.isOwning\n ? relation.joinColumns\n : relation.inverseRelation!.joinColumns\n const conditions = joinColumns\n .map((joinColumn) => {\n return `${relation.entityMetadata.name}.${\n joinColumn.propertyName\n } = ${mainAlias}.${joinColumn.referencedColumn!.propertyName}`\n })\n .join(\" AND \")\n\n qb.innerJoin(\n relation.entityMetadata.target as Function,\n joinAliasName,\n conditions,\n )\n\n if (columns.length === 1) {\n qb.where(\n `${joinAliasName}.${columns[0].propertyPath} IN (:...${\n joinAliasName + \"_\" + columns[0].propertyName\n })`,\n )\n qb.setParameter(\n joinAliasName + \"_\" + columns[0].propertyName,\n entities.map((entity) =>\n columns[0].getEntityValue(entity, true),\n ),\n )\n } else {\n const condition = entities\n .map((entity, entityIndex) => {\n return columns\n .map((column, columnIndex) => {\n const paramName =\n joinAliasName +\n \"_entity_\" +\n entityIndex +\n \"_\" +\n columnIndex\n qb.setParameter(\n paramName,\n column.getEntityValue(entity, true),\n )\n return (\n joinAliasName +\n \".\" +\n column.propertyPath +\n \" = :\" +\n paramName\n )\n })\n .join(\" AND \")\n })\n .map((condition) => \"(\" + condition + \")\")\n .join(\" OR \")\n qb.where(condition)\n }\n\n FindOptionsUtils.joinEagerRelations(\n qb,\n qb.alias,\n qb.expressionMap.mainAlias!.metadata,\n )\n\n return qb.getMany()\n // return qb.getOne(); todo: fix all usages\n }\n\n /**\n * Loads data for one-to-many and one-to-one not owner relations.\n *\n * SELECT post\n * FROM post post\n * WHERE post.[joinColumn.name] = entity[joinColumn.referencedColumn]\n */\n loadOneToManyOrOneToOneNotOwner(\n relation: RelationMetadata,\n entityOrEntities: ObjectLiteral | ObjectLiteral[],\n queryRunner?: QueryRunner,\n queryBuilder?: SelectQueryBuilder,\n ): Promise {\n const entities = Array.isArray(entityOrEntities)\n ? entityOrEntities\n : [entityOrEntities]\n const columns = relation.inverseRelation!.joinColumns\n const qb = queryBuilder\n ? queryBuilder\n : this.connection\n .createQueryBuilder(queryRunner)\n .select(relation.propertyName)\n .from(\n relation.inverseRelation!.entityMetadata.target,\n relation.propertyName,\n )\n\n const aliasName = qb.expressionMap.mainAlias!.name\n\n if (columns.length === 1) {\n qb.where(\n `${aliasName}.${columns[0].propertyPath} IN (:...${\n aliasName + \"_\" + columns[0].propertyName\n })`,\n )\n qb.setParameter(\n aliasName + \"_\" + columns[0].propertyName,\n entities.map((entity) =>\n columns[0].referencedColumn!.getEntityValue(entity, true),\n ),\n )\n } else {\n const condition = entities\n .map((entity, entityIndex) => {\n return columns\n .map((column, columnIndex) => {\n const paramName =\n aliasName +\n \"_entity_\" +\n entityIndex +\n \"_\" +\n columnIndex\n qb.setParameter(\n paramName,\n column.referencedColumn!.getEntityValue(\n entity,\n true,\n ),\n )\n return (\n aliasName +\n \".\" +\n column.propertyPath +\n \" = :\" +\n paramName\n )\n })\n .join(\" AND \")\n })\n .map((condition) => \"(\" + condition + \")\")\n .join(\" OR \")\n qb.where(condition)\n }\n\n FindOptionsUtils.joinEagerRelations(\n qb,\n qb.alias,\n qb.expressionMap.mainAlias!.metadata,\n )\n\n return qb.getMany()\n // return relation.isOneToMany ? qb.getMany() : qb.getOne(); todo: fix all usages\n }\n\n /**\n * Loads data for many-to-many owner relations.\n *\n * SELECT category\n * FROM category category\n * INNER JOIN post_categories post_categories\n * ON post_categories.postId = :postId\n * AND post_categories.categoryId = category.id\n */\n loadManyToManyOwner(\n relation: RelationMetadata,\n entityOrEntities: ObjectLiteral | ObjectLiteral[],\n queryRunner?: QueryRunner,\n queryBuilder?: SelectQueryBuilder,\n ): Promise {\n const entities = Array.isArray(entityOrEntities)\n ? entityOrEntities\n : [entityOrEntities]\n const parameters = relation.joinColumns.reduce(\n (parameters, joinColumn) => {\n parameters[joinColumn.propertyName] = entities.map((entity) =>\n joinColumn.referencedColumn!.getEntityValue(entity, true),\n )\n return parameters\n },\n {} as ObjectLiteral,\n )\n\n const qb = queryBuilder\n ? queryBuilder\n : this.connection\n .createQueryBuilder(queryRunner)\n .select(relation.propertyName)\n .from(relation.type, relation.propertyName)\n\n const mainAlias = qb.expressionMap.mainAlias!.name\n const joinAlias = relation.junctionEntityMetadata!.tableName\n const joinColumnConditions = relation.joinColumns.map((joinColumn) => {\n return `${joinAlias}.${joinColumn.propertyName} IN (:...${joinColumn.propertyName})`\n })\n const inverseJoinColumnConditions = relation.inverseJoinColumns.map(\n (inverseJoinColumn) => {\n return `${joinAlias}.${\n inverseJoinColumn.propertyName\n }=${mainAlias}.${\n inverseJoinColumn.referencedColumn!.propertyName\n }`\n },\n )\n\n qb.innerJoin(\n joinAlias,\n joinAlias,\n [...joinColumnConditions, ...inverseJoinColumnConditions].join(\n \" AND \",\n ),\n ).setParameters(parameters)\n\n FindOptionsUtils.joinEagerRelations(\n qb,\n qb.alias,\n qb.expressionMap.mainAlias!.metadata,\n )\n\n return qb.getMany()\n }\n\n /**\n * Loads data for many-to-many not owner relations.\n *\n * SELECT post\n * FROM post post\n * INNER JOIN post_categories post_categories\n * ON post_categories.postId = post.id\n * AND post_categories.categoryId = post_categories.categoryId\n */\n loadManyToManyNotOwner(\n relation: RelationMetadata,\n entityOrEntities: ObjectLiteral | ObjectLiteral[],\n queryRunner?: QueryRunner,\n queryBuilder?: SelectQueryBuilder,\n ): Promise {\n const entities = Array.isArray(entityOrEntities)\n ? entityOrEntities\n : [entityOrEntities]\n\n const qb = queryBuilder\n ? queryBuilder\n : this.connection\n .createQueryBuilder(queryRunner)\n .select(relation.propertyName)\n .from(relation.type, relation.propertyName)\n\n const mainAlias = qb.expressionMap.mainAlias!.name\n const joinAlias = relation.junctionEntityMetadata!.tableName\n const joinColumnConditions = relation.inverseRelation!.joinColumns.map(\n (joinColumn) => {\n return `${joinAlias}.${\n joinColumn.propertyName\n } = ${mainAlias}.${joinColumn.referencedColumn!.propertyName}`\n },\n )\n const inverseJoinColumnConditions =\n relation.inverseRelation!.inverseJoinColumns.map(\n (inverseJoinColumn) => {\n return `${joinAlias}.${inverseJoinColumn.propertyName} IN (:...${inverseJoinColumn.propertyName})`\n },\n )\n const parameters = relation.inverseRelation!.inverseJoinColumns.reduce(\n (parameters, joinColumn) => {\n parameters[joinColumn.propertyName] = entities.map((entity) =>\n joinColumn.referencedColumn!.getEntityValue(entity, true),\n )\n return parameters\n },\n {} as ObjectLiteral,\n )\n\n qb.innerJoin(\n joinAlias,\n joinAlias,\n [...joinColumnConditions, ...inverseJoinColumnConditions].join(\n \" AND \",\n ),\n ).setParameters(parameters)\n\n FindOptionsUtils.joinEagerRelations(\n qb,\n qb.alias,\n qb.expressionMap.mainAlias!.metadata,\n )\n\n return qb.getMany()\n }\n\n /**\n * Wraps given entity and creates getters/setters for its given relation\n * to be able to lazily load data when accessing this relation.\n */\n enableLazyLoad(\n relation: RelationMetadata,\n entity: ObjectLiteral,\n queryRunner?: QueryRunner,\n ) {\n const relationLoader = this\n const dataIndex = \"__\" + relation.propertyName + \"__\" // in what property of the entity loaded data will be stored\n const promiseIndex = \"__promise_\" + relation.propertyName + \"__\" // in what property of the entity loading promise will be stored\n const resolveIndex = \"__has_\" + relation.propertyName + \"__\" // indicates if relation data already was loaded or not, we need this flag if loaded data is empty\n\n const setData = (entity: ObjectLiteral, value: any) => {\n entity[dataIndex] = value\n entity[resolveIndex] = true\n delete entity[promiseIndex]\n return value\n }\n const setPromise = (entity: ObjectLiteral, value: Promise) => {\n delete entity[resolveIndex]\n delete entity[dataIndex]\n entity[promiseIndex] = value\n value.then(\n // ensure different value is not assigned yet\n (result) =>\n entity[promiseIndex] === value\n ? setData(entity, result)\n : result,\n )\n return value\n }\n\n Object.defineProperty(entity, relation.propertyName, {\n get: function () {\n if (\n this[resolveIndex] === true ||\n this[dataIndex] !== undefined\n )\n // if related data already was loaded then simply return it\n return Promise.resolve(this[dataIndex])\n\n if (this[promiseIndex])\n // if related data is loading then return a promise relationLoader loads it\n return this[promiseIndex]\n\n // nothing is loaded yet, load relation data and save it in the model once they are loaded\n const loader = relationLoader\n .load(relation, this, queryRunner)\n .then((result) =>\n relation.isOneToOne || relation.isManyToOne\n ? result.length === 0\n ? null\n : result[0]\n : result,\n )\n return setPromise(this, loader)\n },\n set: function (value: any | Promise) {\n if (value instanceof Promise) {\n // if set data is a promise then wait for its resolve and save in the object\n setPromise(this, value)\n } else {\n // if its direct data set (non promise, probably not safe-typed)\n setData(this, value)\n }\n },\n configurable: true,\n enumerable: false,\n })\n }\n}\n"],"sourceRoot":".."}