50 lines
1.2 KiB
JavaScript
50 lines
1.2 KiB
JavaScript
'use strict';
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const isExclusive = require('../projection/isExclusive');
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const isInclusive = require('../projection/isInclusive');
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/*!
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* ignore
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*/
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module.exports = function selectPopulatedFields(fields, userProvidedFields, populateOptions) {
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if (populateOptions == null) {
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return;
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}
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const paths = Object.keys(populateOptions);
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userProvidedFields = userProvidedFields || {};
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if (isInclusive(fields)) {
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for (const path of paths) {
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if (!isPathInFields(userProvidedFields, path)) {
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fields[path] = 1;
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} else if (userProvidedFields[path] === 0) {
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delete fields[path];
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}
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}
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} else if (isExclusive(fields)) {
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for (const path of paths) {
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if (userProvidedFields[path] == null) {
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delete fields[path];
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}
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}
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}
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};
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/*!
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* ignore
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*/
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function isPathInFields(userProvidedFields, path) {
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const pieces = path.split('.');
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const len = pieces.length;
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let cur = pieces[0];
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for (let i = 1; i < len; ++i) {
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if (userProvidedFields[cur] != null || userProvidedFields[cur + '.$'] != null) {
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return true;
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}
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cur += '.' + pieces[i];
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}
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return userProvidedFields[cur] != null || userProvidedFields[cur + '.$'] != null;
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}
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