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{QueryBuilder} from \"./QueryBuilder\";\nimport {ObjectLiteral} from \"../common/ObjectLiteral\";\nimport {QueryExpressionMap} from \"./QueryExpressionMap\";\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 RelationRemover {\n\n // -------------------------------------------------------------------------\n // Constructor\n // -------------------------------------------------------------------------\n\n constructor(protected queryBuilder: QueryBuilder<any>,\n protected expressionMap: QueryExpressionMap) {\n }\n\n // -------------------------------------------------------------------------\n // Public Methods\n // -------------------------------------------------------------------------\n\n /**\n * Performs remove operation on a relation.\n */\n async remove(value: any|any[]): Promise<void> {\n const relation = this.expressionMap.relationMetadata;\n\n if (relation.isOneToMany) {\n\n // if (this.expressionMap.of instanceof Array)\n // throw new Error(`You cannot update relations of multiple entities with the same related object. Provide a single entity into .of method.`);\n\n // DELETE FROM post WHERE post.categoryId = of AND post.id = id\n const ofs = this.expressionMap.of instanceof Array ? this.expressionMap.of : [this.expressionMap.of];\n const values = value instanceof Array ? value : [value];\n\n const updateSet: ObjectLiteral = {};\n relation.inverseRelation!.joinColumns.forEach(column => {\n updateSet[column.propertyName] = null;\n });\n\n const parameters: ObjectLiteral = {};\n const conditions: string[] = [];\n ofs.forEach((of, ofIndex) => {\n conditions.push(...values.map((value, valueIndex) => {\n return [\n ...relation.inverseRelation!.joinColumns.map((column, columnIndex) => {\n const parameterName = \"joinColumn_\" + ofIndex + \"_\" + valueIndex + \"_\" + columnIndex;\n parameters[parameterName] = of instanceof Object ? column.referencedColumn!.getEntityValue(of) : of;\n return `${column.propertyPath} = :${parameterName}`;\n }),\n ...relation.inverseRelation!.entityMetadata.primaryColumns.map((column, columnIndex) => {\n const parameterName = \"primaryColumn_\" + valueIndex + \"_\" + valueIndex + \"_\" + columnIndex;\n parameters[parameterName] = value instanceof Object ? column.getEntityValue(value) : value;\n return `${column.propertyPath} = :${parameterName}`;\n })\n ].join(\" AND \");\n }));\n });\n const condition = conditions.map(str => \"(\" + str + \")\").join(\" OR \");\n if (!condition) return;\n\n await this.queryBuilder\n .createQueryBuilder()\n .update(relation.inverseEntityMetadata.target)\n .set(updateSet)\n .where(condition)\n .setParameters(parameters)\n .execute();\n\n } else { // many to many\n\n const junctionMetadata = relation.junctionEntityMetadata!;\n const ofs = this.expressionMap.of instanceof Array ? this.expressionMap.of : [this.expressionMap.of];\n const values = value instanceof Array ? value : [value];\n const firstColumnValues = relation.isManyToManyOwner ? ofs : values;\n const secondColumnValues = relation.isManyToManyOwner ? values : ofs;\n\n const parameters: ObjectLiteral = {};\n const conditions: string[] = [];\n firstColumnValues.forEach((firstColumnVal, firstColumnValIndex) => {\n conditions.push(...secondColumnValues.map((secondColumnVal, secondColumnValIndex) => {\n return [\n ...junctionMetadata.ownerColumns.map((column, columnIndex) => {\n const parameterName = \"firstValue_\" + firstColumnValIndex + \"_\" + secondColumnValIndex + \"_\" + columnIndex;\n parameters[parameterName] = firstColumnVal instanceof Object ? column.referencedColumn!.getEntityValue(firstColumnVal) : firstColumnVal;\n return `${column.databaseName} = :${parameterName}`;\n }),\n ...junctionMetadata.inverseColumns.map((column, columnIndex) => {\n const parameterName = \"secondValue_\" + firstColumnValIndex + \"_\" + secondColumnValIndex + \"_\" + columnIndex;\n parameters[parameterName] = firstColumnVal instanceof Object ? column.referencedColumn!.getEntityValue(secondColumnVal) : secondColumnVal;\n return `${column.databaseName} = :${parameterName}`;\n })\n ].join(\" AND \");\n }));\n });\n const condition = conditions.map(str => \"(\" + str + \")\").join(\" OR \");\n\n await this.queryBuilder\n .createQueryBuilder()\n .delete()\n .from(junctionMetadata.tableName)\n .where(condition)\n .setParameters(parameters)\n .execute();\n }\n }\n\n}"],"sourceRoot":".."} |