control flow confusion

app.js

/* map query string fields to search filters */

var inexactFilters = {
	date_added : function(queryVal, job, cb) {
		cb(moment(job.date_added).format('MM-DD-YYYY') === queryVal);
	},
	tags : function(queryVal, job, cb) {
		console.log(cb.toString());
		app.get('db').tag.getBelongingToJob(job.job_id).then(function(tags) {
			cb(queryVal.split(',').filter(function(tag) { return tags.map(function(tag) { return tag.tag_content; }).indexOf(tag) !== -1; }).length > 0);
		});
	}
};

/* filter the list of filter functions to only include those pertinent to the query string fields */

function selectFilters(filters, query) {
	var result = [];
	for (var key in query)
		if (key in filters)
			result.push(filters[key].bind(null, key));
	return result;
}

/* if query string is present, filter out the job set */

app.route('/search-jobs')
	.all(middleware.restrict)
	.all(middleware.onlyEmployers)
	.get(function(req, res) {
		var query = separateQuery(req.query);
		if (Object.keys(query).length > 0) {
			app.get('db').job.search(query.exact).then(function(jobs) {
				console.log(jobs.length + ' jobs found');

				var filters = selectFilters(inexactFilters, query.inexact);

				async.each(jobs, function(job, cb) {
					async.applyEach(filters, job, function() {
					});
				});

				console.log(jobs.length + ' jobs found post inexact filters');
				res.render('search-jobs');

			});
		} else {
			res.render('search-jobs');
		}
	});