mongodb update to 4.0


mongodb update to 4.0



I'm upgrading from mongodb 3.6 to mongodb 4.0 and have problem with aggregates (it seems).


mongodb 3.6


mongodb 4.0



I've got this error:



TypeError: Cannot read property 'n' of undefinedn at
result.toArray
(/eliot-local-git/node_modules/mongodb/lib/operations/collection_ops.js:237:46)n
at result
(/eliot-local-git/node_modules/mongodb/lib/utils.js:414:17)n at
executeCallback
(/eliot-local-git/node_modules/mongodb/lib/utils.js:406:9)n at
handleCallback
(/eliot-local-git/node_modules/mongodb/lib/utils.js:128:55)n at
cursor.close
(/eliot-local-git/node_modules/mongodb/lib/operations/cursor_ops.js:218:62)n at handleCallback
(/eliot-local-git/node_modules/mongodb/lib/utils.js:128:55)n at
completeClose
(/eliot-local-git/node_modules/mongodb/lib/cursor.js:887:14)n at
_endSession (/eliot-local-git/node_modules/mongodb/lib/cursor.js:898:37)n at
AggregationCursor.Cursor._endSession
(/eliot-local-git/node_modules/mongodb/node_modules/mongodb-core/lib/cursor.js:193:5)n
at AggregationCursor.Cursor._endSession
(/eliot-local-git/node_modules/mongodb/lib/cursor.js:226:59)n at
AggregationCursor.Cursor.close
(/eliot-local-git/node_modules/mongodb/lib/cursor.js:898:19)n at
cursor._next
(/eliot-local-git/node_modules/mongodb/lib/operations/cursor_ops.js:218:23)n at handleCallback
(/eliot-local-git/node_modules/mongodb/node_modules/mongodb-core/lib/cursor.js:202:5)n
at _setCursorNotifiedImpl
(/eliot-local-git/node_modules/mongodb/node_modules/mongodb-core/lib/cursor.js:560:38)n
at self._endSession
(/eliot-local-git/node_modules/mongodb/node_modules/mongodb-core/lib/cursor.js:568:46)n
at AggregationCursor.Cursor._endSession
(/eliot-local-git/node_modules/mongodb/node_modules/mongodb-core/lib/cursor.js:193:5)



My aggregate call look like :


collectionSchema.aggregate(query).exec();



Using :



mongodb v4.0.0



enter image description here



I've tried to use cursor aswell but it ain't worked:


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









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