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R8244/node_modules/mongoose/lib/services/query/selectPopulatedFields.js
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selectPopulatedFields.js
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			'use strict';

			/*!
			* ignore
			*/

			module.exports = function selectPopulatedFields(query) {
			var opts = query._mongooseOptions;

			if (opts.populate != null) {
			var paths = Object.keys(opts.populate);
			var i;
			var userProvidedFields = query._userProvidedFields \|\| {};
			if (query.selectedInclusively()) {
			for (i = 0; i < paths.length; ++i) {
			if (!isPathInFields(userProvidedFields, paths[i])) {
			query.select(paths[i]);
			}
			}
			} else if (query.selectedExclusively()) {
			for (i = 0; i < paths.length; ++i) {
			if (userProvidedFields[paths[i]] == null) {
			delete query._fields[paths[i]];
			}
			}
			}
			}
			};

			/*!
			* ignore
			*/

			function isPathInFields(userProvidedFields, path) {
			var pieces = path.split('.');
			var len = pieces.length;
			var cur = pieces[0];
			for (var i = 1; i < len; ++i) {
			if (userProvidedFields[cur] != null) {
			return true;
			}
			cur += '.' + pieces[i];
			}
			return userProvidedFields[cur] != null;
			}