Replacing stream with cursor and stringifying at the same time

[Tom Piercy]

I recently upgraded an old project to Mongoose 4.5.10 and I've started getting the "Mongoose: Query.prototype.stream() is deprecated in mongoose >= 4.5.0, use Query.prototype.cursor() instead" warnings.

I'm using stream to pipe the stringified content to the response:

Model.find({conditions}).stream({transform:JSON.stringify}).pipe(response);

If I directly replace cursor in the above I get a huge stack trace which I cannot make head or tail of:

    TypeError: first argument must be a string or Buffer

        at ServerResponse.OutgoingMessage.write (_http_outgoing.js:447:11)

        at QueryCursor.ondata (_stream_readable.js:542:20)

        at emitOne (events.js:77:13)

        at QueryCursor.emit (events.js:169:7)

        at readableAddChunk (_stream_readable.js:153:18)

        at QueryCursor.Readable.push (_stream_readable.js:111:10)

        at [node_modules_path]/mongoose/lib/querycursor.js:70:11

        at [node_modules_path]/mongoose/lib/querycursor.js:258:5

        at model.Document.init ([node_modules_path]/mongoose/lib/document.js:296:5)

        at _create ([node_modules_path]/mongoose/lib/querycursor.js:254:12)

        at [node_modules_path]/mongoose/lib/querycursor.js:219:17

        at handleCallback ([node_modules_path]/mongoose/node_modules/mongodb/lib/utils.js:96:12)

        at [node_modules_path]/mongoose/node_modules/mongodb/lib/cursor.js:661:5

        at handleCallback ([node_modules_path]/mongoose/node_modules/mongodb/node_modules/mongodb-core/lib/cursor.js:159:5)

        at nextFunction ([node_modules_path]/mongoose/node_modules/mongodb/node_modules/mongodb-core/lib/cursor.js:683:5)

        at [node_modules_path]/mongoose/node_modules/mongodb/node_modules/mongodb-core/lib/cursor.js:585:7

        at queryCallback ([node_modules_path]/mongoose/node_modules/mongodb/node_modules/mongodb-core/lib/cursor.js:241:5)

        at Callbacks.emit ([node_modules_path]/mongoose/node_modules/mongodb/node_modules/mongodb-core/lib/topologies/server.js:119:3)

        at null.messageHandler ([node_modules_path]/mongoose/node_modules/mongodb/node_modules/mongodb-core/lib/topologies/server.js:358:23)

        at Socket.<anonymous> ([node_modules_path]/mongoose/node_modules/mongodb/node_modules/mongodb-core/lib/connection/connection.js:211:18)

        at emitOne (events.js:77:13)

        at Socket.emit (events.js:169:7)

    

I was wondering what the new form of the call should be once query.stream() disappears? I've not managed to find any suggestions other than using a combination of lean and exec. Most suggestions seem to suggest the old form using stream.