Question

我正在从mongodb 3.6升级到mongodb 4.0，并对聚合（似乎）有问题。

我遇到了这个错误：

TypeError：无法读取未定义的属性'n'\ n result.toArray （/eliot-local-git/node_modules/mongodb/lib/operations/collection_ops.js:237:46)\n 结果（/eliot-local-git/node_modules/mongodb/lib/utils.js:414:17)\n在 executeCallback （/eliot-local-git/node_modules/mongodb/lib/utils.js:406:9)\n在 handleCallback （/eliot-local-git/node_modules/mongodb/lib/utils.js:128:55)\n在 cursor.close （/eliot-local-git/node_modules/mongodb/lib/operations/cursor_ops.js:218:62)\n在handleCallback （/eliot-local-git/node_modules/mongodb/lib/utils.js:128:55)\n在 complete关闭（/eliot-local-git/node_modules/mongodb/lib/cursor.js:887:14)\n在 _endSession（/eliot-local-git/node_modules/mongodb/lib/cursor.js:898:37)\n在 AggregationCursor.Cursor._endSession （/eliot-local-git/node_modules/mongodb/node_modules/mongodb-core/lib/cursor.js:193:5)\n 在AggregationCursor.Cursor._endSession中（/eliot-local-git/node_modules/mongodb/lib/cursor.js:226:59)\n在 AggregationCursor.Cursor.close （/eliot-local-git/node_modules/mongodb/lib/cursor.js:898:19)\n在 cursor._next （/eliot-local-git/node_modules/mongodb/lib/operations/cursor_ops.js:218:23)\n在handleCallback （/eliot-local-git/node_modules/mongodb/node_modules/mongodb-core/lib/cursor.js:202:5)\n 在_setCursorNotifiedImpl （/eliot-local-git/node_modules/mongodb/node_modules/mongodb-core/lib/cursor.js:560:38)\n 在self._endSession （/eliot-local-git/node_modules/mongodb/node_modules/mongodb-core/lib/cursor.js:568:46)\n 在AggregationCursor.Cursor._endSession中（/eliot-local-git/node_modules/mongodb/node_modules/mongodb-core/lib/cursor.js:193:5）

我的总通话如下：

collectionSchema.aggregate(query).exec();

使用：

mongodb v4.0.0

我也尝试过使用游标，但是它没有用：

collectionSchema.aggregate(query)
        .cursor({
          batchSize: 10
        })
        .exec();

@Alex Blex here是我看到的与mongodb-native-driver 3.1兼容的地方

Answer 1

有一个错误https://jira.mongodb.org/browse/NODE-1543，已在14小时前的v3.1.1版中修复：https://github.com/mongodb/node-mongodb-native/commit/09c7d8e4ce302f1c8f6339dd19ee4b86e40b30a8

TypeError：无法在result.toArray读取未定义\ n的属性'n'

1 个答案: