Cursor-based iteration with Mongoose

Using cursor-based iteration can be useful when there is a need to iterate (in memory) over all of the documents from a collection and every document is a big object. Every document can be projected to return only specific fields.

const cursor = Model.find()
  .select('/* several fields */')
  .cursor();
for (
  let document = await cursor.next();
  document != null;
  document = await cursor.next()
) {
  // ...
}

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