Simple Chat Room in NodeJS, expressJS and mongoDB in Docker Swarm
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4 years ago
'use strict';
module.exports = function normalizeRefPath(refPath, doc, populatedPath) {
if (refPath == null) {
return refPath;
}
if (typeof refPath === 'function') {
refPath = refPath.call(doc, doc, populatedPath);
}
// If populated path has numerics, the end `refPath` should too. For example,
// if populating `a.0.b` instead of `a.b` and `b` has `refPath = a.c`, we
// should return `a.0.c` for the refPath.
const hasNumericProp = /(\.\d+$|\.\d+\.)/g;
if (hasNumericProp.test(populatedPath)) {
const chunks = populatedPath.split(hasNumericProp);
if (chunks[chunks.length - 1] === '') {
throw new Error('Can\'t populate individual element in an array');
}
let _refPath = '';
let _remaining = refPath;
// 2nd, 4th, etc. will be numeric props. For example: `[ 'a', '.0.', 'b' ]`
for (let i = 0; i < chunks.length; i += 2) {
const chunk = chunks[i];
if (_remaining.startsWith(chunk + '.')) {
_refPath += _remaining.substr(0, chunk.length) + chunks[i + 1];
_remaining = _remaining.substr(chunk.length + 1);
} else if (i === chunks.length - 1) {
_refPath += _remaining;
_remaining = '';
break;
} else {
throw new Error('Could not normalize ref path, chunk ' + chunk + ' not in populated path');
}
}
return _refPath;
}
return refPath;
};