aggregate.js
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aggregate.js
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	"use strict";
	const Promise = require("bluebird");

	module.exports = function(app) {
	return {
	name: "aggregate",
	calculate: function(context, params, item, db_document) {
	let stages = params.stages;
	if (params.stages instanceof Function) {
	stages = params.stages(context, params, item, db_document);
	}
	return app.Datastore.aggregate(params.collection, stages).then(
	function(documents) {
	if (documents.length) {
	return documents[0].result;
	} else {
	return null;
	}
	}
	);
	},
	};
	};