Source: core/delete_documents_spanned.js

/*
 * This file is part of PKM (Persistent Knowledge Monitor).
 * Copyright (c) 2020 Capgemini Group, Commissariat à l'énergie atomique et aux énergies alternatives,
 *                    OW2, Sysgo AG, Technikon, Tree Technology, Universitat Politècnica de València.
 * 
 * PKM is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3 as published by
 * the Free Software Foundation.
 * 
 * PKM is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with PKM.  If not, see <https://www.gnu.org/licenses/>.
 */

/**
 * Delete some documents in a generic manner from several collections of a database
 * 
 * @memberof PKM
 * @instance
 * @param {string} dbName - database name
 * @param {Array.<string>} collection_names - collection names
 * @param {Object} [query] - query
 * @param {Object} [options] - options
 * 
 * @return {Promise} a promise
 */
function delete_documents_spanned(dbName, collection_names, query = {}, options = {})
{
	return new Promise(function(resolve, reject)
	{
		// request for document deletion in each collections
		Promise.allSettled(collection_names.map((collection_name) => this.delete_documents(dbName, collection_name, query, options))).then((promise_values) =>
		{
			// if there are no rejected promises
			if(promise_values.find((promise_value) => promise_value.status === 'rejected') === undefined)
			{
				// then resolve
				resolve();
			}
			else
			{
				// otherwise
				const error = require('./error');
				
				// if there are no failures, i.e. there are no rejected promises which are not 404 not found errors
				const failure = promise_values.find((promise_value) => (promise_value.status === 'rejected') && !(promise_value.reason instanceof error.PKM_NotFound));
				if(failure === undefined)
				{
					// then if there's a resolved promise (at least one of the others is a 404 not found error)
					const found = promise_values.find((promise_value) => (promise_value.status === 'fulfilled'));
					if(found !== undefined)
					{
						// then resolve
						resolve();
					}
					else
					{
						// otherwise reject with Not found
						reject(this.NotFound());
					}
				}
				else
				{
					// otherwise, reject with the first failure
					reject(failure.reason);
				}
			}
		});
	}.bind(this));
}

module.exports.delete_documents_spanned = delete_documents_spanned;