east-mongo/lib/helpers.js

mongodb adapter for east (node.js database migration tool)

'use strict';

exports.dropIndexIfExists =
	function dropIndexIfExists(collection, index, callback) {
		let indexName = '';

		return Promise.resolve()
			.then(() => {
				// convert object to string coz `indexExists` doesn't`
				// recognize objects
				if (typeof index === 'object') {
					Object.keys(index).forEach((key) => {
						indexName += `_${key}_${index[key]}`;
					});

					indexName = indexName.replace(/^_/, '');
				} else {
					indexName = index;
				}

				return collection.indexExists(indexName);
			})
			.then((indexExist) => {
				if (indexExist) {
					return collection.dropIndex(indexName);
				}
			})
			.then(() => {
				if (typeof callback === 'function') {
					callback();
				}
			});
	};