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41 lines
853 B
JavaScript
41 lines
853 B
JavaScript
'use strict';
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/**
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* Creates an object that precomputes whether a given path has child fields in
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* the projection.
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*
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* #### Example:
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*
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* const res = hasIncludedChildren({ 'a.b.c': 0 });
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* res.a; // 1
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* res['a.b']; // 1
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* res['a.b.c']; // 1
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* res['a.c']; // undefined
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*
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* @param {Object} fields
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* @api private
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*/
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module.exports = function hasIncludedChildren(fields) {
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const hasIncludedChildren = {};
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const keys = Object.keys(fields);
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for (const key of keys) {
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if (key.indexOf('.') === -1) {
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hasIncludedChildren[key] = 1;
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continue;
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}
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const parts = key.split('.');
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let c = parts[0];
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for (let i = 0; i < parts.length; ++i) {
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hasIncludedChildren[c] = 1;
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if (i + 1 < parts.length) {
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c = c + '.' + parts[i + 1];
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}
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}
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}
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return hasIncludedChildren;
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};
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