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33 lines
685 B
33 lines
685 B
3 years ago
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'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[keys[ki]];
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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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if (keys[ki] !== '_id' && isDefiningProjection(projection[keys[ki]])) {
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exclude = !projection[keys[ki]];
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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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