A Map-Reduce listing remaining dataset coverage zones with slashes in identifiers

zones-with-slashes.js

/*
 * List zones with slahes in identifiers with their occurence count
 */

function mapZonesWithSlahes() {
    this.spatial.zones.forEach(function(zone) {
	if (zone.indexOf('/') >= 0) {
	    emit(zone, 1);
	}
    });
}

function countOccurences(key, values) {
    return Array.sum(values);
}

db.dataset.mapReduce(mapZonesWithSlahes, countOccurences, {
    // See https://docs.mongodb.com/manual/reference/method/db.collection.mapReduce/#out-options
    out: 'zones_with_slashes',
    query: {'spatial.zones': {$exists: true}}
});