file-reference.js
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file-reference.js
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	module.exports = function(app) {
	return {
	name: "file_reference",
	is_proper_value: function(context, params, value) {
	return app.Datastore.find("files", { id: value }).then(function(
	results
	) {
	if (results.length === 0) {
	return Promise.reject("Bad file id: " + value);
	} else {
	return Promise.resolve();
	}
	});
	},
	format: function(context, params, file_id, format) {
	if (format === "internal") {
	return app.Datastore.find("files", { id: file_id }).then(
	a => a[0]
	);
	} else {
	return file_id;
	}
	},
	};
	};