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{Connection, ObjectLiteral, QueryRunner} from \"../\";\nimport {RelationMetadata} from \"../metadata/RelationMetadata\";\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 // -------------------------------------------------------------------------\n // Constructor\n // -------------------------------------------------------------------------\n\n constructor(private connection: Connection) {\n }\n\n // -------------------------------------------------------------------------\n // Public Methods\n // -------------------------------------------------------------------------\n\n /**\n * Loads relation data for the given entity and its relation.\n */\n load(relation: RelationMetadata, entityOrEntities: ObjectLiteral|ObjectLiteral[], queryRunner?: QueryRunner): Promise<any[]> { // 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(relation, entityOrEntities, queryRunner);\n\n } else if (relation.isOneToMany || relation.isOneToOneNotOwner) {\n return this.loadOneToManyOrOneToOneNotOwner(relation, entityOrEntities, queryRunner);\n\n } else if (relation.isManyToManyOwner) {\n return this.loadManyToManyOwner(relation, entityOrEntities, queryRunner);\n\n } else { // many-to-many non owner\n return this.loadManyToManyNotOwner(relation, entityOrEntities, queryRunner);\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(relation: RelationMetadata, entityOrEntities: ObjectLiteral|ObjectLiteral[], queryRunner?: QueryRunner): Promise<any> {\n const entities = entityOrEntities instanceof Array ? entityOrEntities : [entityOrEntities];\n const columns = relation.entityMetadata.primaryColumns;\n const joinColumns = relation.isOwning ? relation.joinColumns : relation.inverseRelation!.joinColumns;\n const conditions = joinColumns.map(joinColumn => {\n return `${relation.entityMetadata.name}.${joinColumn.propertyName} = ${relation.propertyName}.${joinColumn.referencedColumn!.propertyName}`;\n }).join(\" AND \");\n\n const joinAliasName = relation.entityMetadata.name;\n const qb = this.connection\n .createQueryBuilder(queryRunner)\n .select(relation.propertyName) // category\n .from(relation.type, relation.propertyName) // Category, category\n .innerJoin(relation.entityMetadata.target as Function, joinAliasName, conditions);\n\n if (columns.length === 1) {\n qb.where(`${joinAliasName}.${columns[0].propertyPath} IN (:...${joinAliasName + \"_\" + columns[0].propertyName})`);\n qb.setParameter(joinAliasName + \"_\" + columns[0].propertyName, entities.map(entity => columns[0].getEntityValue(entity)));\n\n } else {\n const condition = entities.map((entity, entityIndex) => {\n return columns.map((column, columnIndex) => {\n const paramName = joinAliasName + \"_entity_\" + entityIndex + \"_\" + columnIndex;\n qb.setParameter(paramName, column.getEntityValue(entity));\n return joinAliasName + \".\" + column.propertyPath + \" = :\" + paramName;\n }).join(\" AND \");\n }).map(condition => \"(\" + condition + \")\").join(\" OR \");\n qb.where(condition);\n }\n\n return qb.getMany();\n // return qb.getOne(); todo: fix all usages\n }\n\n /**\n * Loads data for one-to-many and one-to-one not owner relations.\n *\n * SELECT post\n * FROM post post\n * WHERE post.[joinColumn.name] = entity[joinColumn.referencedColumn]\n */\n loadOneToManyOrOneToOneNotOwner(relation: RelationMetadata, entityOrEntities: ObjectLiteral|ObjectLiteral[], queryRunner?: QueryRunner): Promise<any> {\n const entities = entityOrEntities instanceof Array ? entityOrEntities : [entityOrEntities];\n const aliasName = relation.propertyName;\n const columns = relation.inverseRelation!.joinColumns;\n const qb = this.connection\n .createQueryBuilder(queryRunner)\n .select(aliasName)\n .from(relation.inverseRelation!.entityMetadata.target, aliasName);\n\n if (columns.length === 1) {\n qb.where(`${aliasName}.${columns[0].propertyPath} IN (:...${aliasName + \"_\" + columns[0].propertyName})`);\n qb.setParameter(aliasName + \"_\" + columns[0].propertyName, entities.map(entity => columns[0].referencedColumn!.getEntityValue(entity)));\n\n } else {\n const condition = entities.map((entity, entityIndex) => {\n return columns.map((column, columnIndex) => {\n const paramName = aliasName + \"_entity_\" + entityIndex + \"_\" + columnIndex;\n qb.setParameter(paramName, column.referencedColumn!.getEntityValue(entity));\n return aliasName + \".\" + column.propertyPath + \" = :\" + paramName;\n }).join(\" AND \");\n }).map(condition => \"(\" + condition + \")\").join(\" OR \");\n qb.where(condition);\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(relation: RelationMetadata, entityOrEntities: ObjectLiteral|ObjectLiteral[], queryRunner?: QueryRunner): Promise<any> {\n const entities = entityOrEntities instanceof Array ? entityOrEntities : [entityOrEntities];\n const mainAlias = relation.propertyName;\n const joinAlias = relation.junctionEntityMetadata!.tableName;\n const joinColumnConditions = relation.joinColumns.map(joinColumn => {\n return `${joinAlias}.${joinColumn.propertyName} IN (:...${joinColumn.propertyName})`;\n });\n const inverseJoinColumnConditions = relation.inverseJoinColumns.map(inverseJoinColumn => {\n return `${joinAlias}.${inverseJoinColumn.propertyName}=${mainAlias}.${inverseJoinColumn.referencedColumn!.propertyName}`;\n });\n const parameters = relation.joinColumns.reduce((parameters, joinColumn) => {\n parameters[joinColumn.propertyName] = entities.map(entity => joinColumn.referencedColumn!.getEntityValue(entity));\n return parameters;\n }, {} as ObjectLiteral);\n\n return this.connection\n .createQueryBuilder(queryRunner)\n .select(mainAlias)\n .from(relation.type, mainAlias)\n .innerJoin(joinAlias, joinAlias, [...joinColumnConditions, ...inverseJoinColumnConditions].join(\" AND \"))\n .setParameters(parameters)\n .getMany();\n }\n\n /**\n * Loads data for many-to-many not owner relations.\n *\n * SELECT post\n * FROM post post\n * INNER JOIN post_categories post_categories\n * ON post_categories.postId = post.id\n * AND post_categories.categoryId = post_categories.categoryId\n */\n loadManyToManyNotOwner(relation: RelationMetadata, entityOrEntities: ObjectLiteral|ObjectLiteral[], queryRunner?: QueryRunner): Promise<any> {\n const entities = entityOrEntities instanceof Array ? entityOrEntities : [entityOrEntities];\n const mainAlias = relation.propertyName;\n const joinAlias = relation.junctionEntityMetadata!.tableName;\n const joinColumnConditions = relation.inverseRelation!.joinColumns.map(joinColumn => {\n return `${joinAlias}.${joinColumn.propertyName} = ${mainAlias}.${joinColumn.referencedColumn!.propertyName}`;\n });\n const inverseJoinColumnConditions = relation.inverseRelation!.inverseJoinColumns.map(inverseJoinColumn => {\n return `${joinAlias}.${inverseJoinColumn.propertyName} IN (:...${inverseJoinColumn.propertyName})`;\n });\n const parameters = relation.inverseRelation!.inverseJoinColumns.reduce((parameters, joinColumn) => {\n parameters[joinColumn.propertyName] = entities.map(entity => joinColumn.referencedColumn!.getEntityValue(entity));\n return parameters;\n }, {} as ObjectLiteral);\n\n return this.connection\n .createQueryBuilder(queryRunner)\n .select(mainAlias)\n .from(relation.type, mainAlias)\n .innerJoin(joinAlias, joinAlias, [...joinColumnConditions, ...inverseJoinColumnConditions].join(\" AND \"))\n .setParameters(parameters)\n .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(relation: RelationMetadata, entity: ObjectLiteral, queryRunner?: QueryRunner) {\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 Object.defineProperty(entity, relation.propertyName, {\n get: function() {\n if (this[resolveIndex] === true || this[dataIndex]) // if related data already was loaded then simply return it\n return Promise.resolve(this[dataIndex]);\n\n if (this[promiseIndex]) // 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 this[promiseIndex] = relationLoader.load(relation, this, queryRunner).then(result => {\n if (relation.isOneToOne || relation.isManyToOne) result = result[0];\n this[dataIndex] = result;\n this[resolveIndex] = true;\n delete this[promiseIndex];\n return this[dataIndex];\n });\n return this[promiseIndex];\n },\n set: function(value: any|Promise<any>) {\n if (value instanceof Promise) { // if set data is a promise then wait for its resolve and save in the object\n value.then(result => {\n this[dataIndex] = result;\n this[resolveIndex] = true;\n });\n\n } else { // if its direct data set (non promise, probably not safe-typed)\n this[dataIndex] = value;\n this[resolveIndex] = true;\n }\n },\n configurable: true\n });\n }\n\n}\n"],"sourceRoot":".."}
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