selectPopulatedFields.js
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'use strict';
/*!
* ignore
*/
module.exports = function selectPopulatedFields(query) {
const opts = query._mongooseOptions;
if (opts.populate != null) {
const paths = Object.keys(opts.populate);
const userProvidedFields = query._userProvidedFields || {};
if (query.selectedInclusively()) {
for (const path of paths) {
if (!isPathInFields(userProvidedFields, path)) {
query.select(path);
} else if (userProvidedFields[path] === 0) {
delete query._fields[path];
}
}
} else if (query.selectedExclusively()) {
for (const path of paths) {
if (userProvidedFields[path] == null) {
delete query._fields[path];
}
}
}
}
};
/*!
* ignore
*/
function isPathInFields(userProvidedFields, path) {
const pieces = path.split('.');
const len = pieces.length;
let cur = pieces[0];
for (let i = 1; i < len; ++i) {
if (userProvidedFields[cur] != null) {
return true;
}
cur += '.' + pieces[i];
}
return userProvidedFields[cur] != null;
}