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{QueryBuilder} from \"./QueryBuilder\";\nimport {RelationUpdater} from \"./RelationUpdater\";\nimport {RelationRemover} from \"./RelationRemover\";\n\n/**\n * Allows to work with entity relations and perform specific operations with those relations.\n *\n * todo: add transactions everywhere\n */\nexport class RelationQueryBuilder<Entity> extends QueryBuilder<Entity> {\n\n // -------------------------------------------------------------------------\n // Public Implemented Methods\n // -------------------------------------------------------------------------\n\n /**\n * Gets generated sql query without parameters being replaced.\n */\n getQuery(): string {\n return \"\";\n }\n\n // -------------------------------------------------------------------------\n // Public Methods\n // -------------------------------------------------------------------------\n\n /**\n * Sets entity (target) which relations will be updated.\n */\n of(entity: any|any[]): this {\n this.expressionMap.of = entity;\n return this;\n }\n\n /**\n * Sets entity relation's value.\n * Value can be entity, entity id or entity id map (if entity has composite ids).\n * Works only for many-to-one and one-to-one relations.\n * For many-to-many and one-to-many relations use #add and #remove methods instead.\n */\n async set(value: any): Promise<void> {\n const relation = this.expressionMap.relationMetadata;\n\n if (!this.expressionMap.of) // todo: move this check before relation query builder creation?\n throw new Error(`Entity whose relation needs to be set is not set. Use .of method to define whose relation you want to set.`);\n\n if (relation.isManyToMany || relation.isOneToMany)\n throw new Error(`Set operation is only supported for many-to-one and one-to-one relations. ` +\n `However given \"${relation.propertyPath}\" has ${relation.relationType} relation. ` +\n `Use .add() method instead.`);\n\n // if there are multiple join columns then user must send id map as \"value\" argument. check if he really did it\n if (relation.joinColumns &&\n relation.joinColumns.length > 1 &&\n (!(value instanceof Object) || Object.keys(value).length < relation.joinColumns.length))\n throw new Error(`Value to be set into the relation must be a map of relation ids, for example: .set({ firstName: \"...\", lastName: \"...\" })`);\n\n const updater = new RelationUpdater(this, this.expressionMap);\n return updater.update(value);\n }\n\n /**\n * Adds (binds) given value to entity relation.\n * Value can be entity, entity id or entity id map (if entity has composite ids).\n * Value also can be array of entities, array of entity ids or array of entity id maps (if entity has composite ids).\n * Works only for many-to-many and one-to-many relations.\n * For many-to-one and one-to-one use #set method instead.\n */\n async add(value: any|any[]): Promise<void> {\n if (value instanceof Array && value.length === 0)\n return;\n\n const relation = this.expressionMap.relationMetadata;\n\n if (!this.expressionMap.of) // todo: move this check before relation query builder creation?\n throw new Error(`Entity whose relation needs to be set is not set. Use .of method to define whose relation you want to set.`);\n\n if (relation.isManyToOne || relation.isOneToOne)\n throw new Error(`Add operation is only supported for many-to-many and one-to-many relations. ` +\n `However given \"${relation.propertyPath}\" has ${relation.relationType} relation. ` +\n `Use .set() method instead.`);\n\n // if there are multiple join columns then user must send id map as \"value\" argument. check if he really did it\n if (relation.joinColumns &&\n relation.joinColumns.length > 1 &&\n (!(value instanceof Object) || Object.keys(value).length < relation.joinColumns.length))\n throw new Error(`Value to be set into the relation must be a map of relation ids, for example: .set({ firstName: \"...\", lastName: \"...\" })`);\n\n const updater = new RelationUpdater(this, this.expressionMap);\n return updater.update(value);\n }\n\n /**\n * Removes (unbinds) given value from entity relation.\n * Value can be entity, entity id or entity id map (if entity has composite ids).\n * Value also can be array of entities, array of entity ids or array of entity id maps (if entity has composite ids).\n * Works only for many-to-many and one-to-many relations.\n * For many-to-one and one-to-one use #set method instead.\n */\n async remove(value: any|any[]): Promise<void> {\n if (value instanceof Array && value.length === 0)\n return;\n\n const relation = this.expressionMap.relationMetadata;\n\n if (!this.expressionMap.of) // todo: move this check before relation query builder creation?\n throw new Error(`Entity whose relation needs to be set is not set. Use .of method to define whose relation you want to set.`);\n\n if (relation.isManyToOne || relation.isOneToOne)\n throw new Error(`Add operation is only supported for many-to-many and one-to-many relations. ` +\n `However given \"${relation.propertyPath}\" has ${relation.relationType} relation. ` +\n `Use .set(null) method instead.`);\n\n const remover = new RelationRemover(this, this.expressionMap);\n return remover.remove(value);\n }\n\n /**\n * Adds (binds) and removes (unbinds) given values to/from entity relation.\n * Value can be entity, entity id or entity id map (if entity has composite ids).\n * Value also can be array of entities, array of entity ids or array of entity id maps (if entity has composite ids).\n * Works only for many-to-many and one-to-many relations.\n * For many-to-one and one-to-one use #set method instead.\n */\n async addAndRemove(added: any|any[], removed: any|any[]): Promise<void> {\n await this.remove(removed);\n await this.add(added);\n }\n\n /**\n * Gets entity's relation id.\n async getId(): Promise<any> {\n\n }*/\n\n /**\n * Gets entity's relation ids.\n async getIds(): Promise<any[]> {\n return [];\n }*/\n\n /**\n * Loads a single entity (relational) from the relation.\n * You can also provide id of relational entity to filter by.\n */\n async loadOne<T = any>(): Promise<T|undefined> {\n return this.loadMany<T>().then(results => results[0]);\n }\n\n /**\n * Loads many entities (relational) from the relation.\n * You can also provide ids of relational entities to filter by.\n */\n async loadMany<T = any>(): Promise<T[]> {\n let of = this.expressionMap.of;\n if (!(of instanceof Object)) {\n const metadata = this.expressionMap.mainAlias!.metadata;\n if (metadata.hasMultiplePrimaryKeys)\n throw new Error(`Cannot load entity because only one primary key was specified, however entity contains multiple primary keys`);\n\n of = metadata.primaryColumns[0].createValueMap(of);\n }\n\n return this.connection.relationLoader.load(this.expressionMap.relationMetadata, of);\n }\n\n}"],"sourceRoot":".."}
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