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
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
'use strict';
const get = require('../get');const helperIsObject = require('../isObject');const decorateDiscriminatorIndexOptions = require('../indexes/decorateDiscriminatorIndexOptions');
/** * Gather all indexes defined in the schema, including single nested, * document arrays, and embedded discriminators. * @param {Schema} schema * @api private */
module.exports = function getIndexes(schema) {  let indexes = [];  const schemaStack = new WeakMap();  const indexTypes = schema.constructor.indexTypes;  const indexByName = new Map();
  collectIndexes(schema);  return indexes;
  function collectIndexes(schema, prefix, baseSchema) {    // Ignore infinitely nested schemas, if we've already seen this schema    // along this path there must be a cycle    if (schemaStack.has(schema)) {      return;    }    schemaStack.set(schema, true);
    prefix = prefix || '';    const keys = Object.keys(schema.paths);
    for (const key of keys) {      const path = schema.paths[key];      if (baseSchema != null && baseSchema.paths[key]) {        // If looking at an embedded discriminator schema, don't look at paths        // that the        continue;      }
      if (path.$isMongooseDocumentArray || path.$isSingleNested) {        if (get(path, 'options.excludeIndexes') !== true &&            get(path, 'schemaOptions.excludeIndexes') !== true &&            get(path, 'schema.options.excludeIndexes') !== true) {          collectIndexes(path.schema, prefix + key + '.');        }
        if (path.schema.discriminators != null) {          const discriminators = path.schema.discriminators;          const discriminatorKeys = Object.keys(discriminators);          for (const discriminatorKey of discriminatorKeys) {            collectIndexes(discriminators[discriminatorKey],              prefix + key + '.', path.schema);          }        }
        // Retained to minimize risk of backwards breaking changes due to        // gh-6113        if (path.$isMongooseDocumentArray) {          continue;        }      }
      const index = path._index || (path.caster && path.caster._index);
      if (index !== false && index !== null && index !== undefined) {        const field = {};        const isObject = helperIsObject(index);        const options = isObject ? index : {};        const type = typeof index === 'string' ? index :          isObject ? index.type :            false;
        if (type && indexTypes.indexOf(type) !== -1) {          field[prefix + key] = type;        } else if (options.text) {          field[prefix + key] = 'text';          delete options.text;        } else {          const isDescendingIndex = Number(index) === -1;          field[prefix + key] = isDescendingIndex ? -1 : 1;        }
        delete options.type;        if (!('background' in options)) {          options.background = true;        }        if (schema.options.autoIndex != null) {          options._autoIndex = schema.options.autoIndex;        }
        const indexName = options && options.name;
        if (typeof indexName === 'string') {          if (indexByName.has(indexName)) {            Object.assign(indexByName.get(indexName), field);          } else {            indexes.push([field, options]);            indexByName.set(indexName, field);          }        } else {          indexes.push([field, options]);          indexByName.set(indexName, field);        }      }    }
    schemaStack.delete(schema);
    if (prefix) {      fixSubIndexPaths(schema, prefix);    } else {      schema._indexes.forEach(function(index) {        const options = index[1];        if (!('background' in options)) {          options.background = true;        }        decorateDiscriminatorIndexOptions(schema, options);      });      indexes = indexes.concat(schema._indexes);    }  }
  /**   * Checks for indexes added to subdocs using Schema.index().   * These indexes need their paths prefixed properly.   *   * schema._indexes = [ [indexObj, options], [indexObj, options] ..]   * @param {Schema} schema   * @param {String} prefix   * @api private   */
  function fixSubIndexPaths(schema, prefix) {    const subindexes = schema._indexes;    const len = subindexes.length;    for (let i = 0; i < len; ++i) {      const indexObj = subindexes[i][0];      const indexOptions = subindexes[i][1];      const keys = Object.keys(indexObj);      const klen = keys.length;      const newindex = {};
      // use forward iteration, order matters      for (let j = 0; j < klen; ++j) {        const key = keys[j];        newindex[prefix + key] = indexObj[key];      }
      const newIndexOptions = Object.assign({}, indexOptions);      if (indexOptions != null && indexOptions.partialFilterExpression != null) {        newIndexOptions.partialFilterExpression = {};        const partialFilterExpression = indexOptions.partialFilterExpression;        for (const key of Object.keys(partialFilterExpression)) {          newIndexOptions.partialFilterExpression[prefix + key] =            partialFilterExpression[key];        }      }
      indexes.push([newindex, newIndexOptions]);    }  }};