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36 lines
809 B
JavaScript
36 lines
809 B
JavaScript
'use strict';
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const isDefiningProjection = require('./isDefiningProjection');
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/*!
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* ignore
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*/
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module.exports = function isExclusive(projection) {
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if (projection == null) {
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return null;
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}
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const keys = Object.keys(projection);
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let ki = keys.length;
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let exclude = null;
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if (ki === 1 && keys[0] === '_id') {
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exclude = !projection._id;
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} else {
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while (ki--) {
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// Does this projection explicitly define inclusion/exclusion?
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// Explicitly avoid `$meta` and `$slice`
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const key = keys[ki];
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if (key !== '_id' && isDefiningProjection(projection[key])) {
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exclude = (projection[key] != null && typeof projection[key] === 'object') ?
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isExclusive(projection[key]) :
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!projection[key];
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break;
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}
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}
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}
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return exclude;
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};
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