1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
'use strict';
const MongooseError = require('../../error/mongooseError');const isPathExcluded = require('../projection/isPathExcluded');const lookupLocalFields = require('./lookupLocalFields');const mpath = require('mpath');const util = require('util');const utils = require('../../utils');
const hasNumericPropRE = /(\.\d+$|\.\d+\.)/g;
module.exports = function modelNamesFromRefPath(refPath, doc, populatedPath, modelSchema, queryProjection) {  if (refPath == null) {    return [];  }
  if (typeof refPath === 'string' && queryProjection != null && isPathExcluded(queryProjection, refPath)) {    throw new MongooseError('refPath `' + refPath + '` must not be excluded in projection, got ' +      util.inspect(queryProjection));  }
  // 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.
  if (hasNumericPropRE.test(populatedPath)) {    const chunks = populatedPath.split(hasNumericPropRE);
    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.substring(0, chunk.length) + chunks[i + 1];        _remaining = _remaining.substring(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');      }    }
    const refValue = mpath.get(_refPath, doc, lookupLocalFields);    let modelNames = Array.isArray(refValue) ? refValue : [refValue];    modelNames = utils.array.flatten(modelNames);    return modelNames;  }
  const refValue = mpath.get(refPath, doc, lookupLocalFields);
  let modelNames;  if (modelSchema != null && modelSchema.virtuals.hasOwnProperty(refPath)) {    modelNames = [modelSchema.virtuals[refPath].applyGetters(void 0, doc)];  } else {    modelNames = Array.isArray(refValue) ? refValue : [refValue];  }
  modelNames = utils.array.flatten(modelNames);
  return modelNames;};