问如何将MongoDB游标的结果返回Actix以供显示？

EN

pub async fn get_aggregation_as_json_response(
    db: &Database,
    aggr_pipeline: Vec<Document>,
) -> HttpResponse {
    let mut cursor = db
        .collection_with_type::<ExampleModel>("examplemodel")
        .aggregate(aggr_pipeline, None)
        .await
        .expect("Error performing aggregation on examplemodel  collection.");

    let mut results: Vec<Document> = Vec::new();

    while let Some(result) = cursor.next().await {
        match result {
            Ok(document) => {
                results.push(document);
            }
            Err(_) => {
                return HttpResponse::InternalServerError().finish();
            }
        }
    }

    HttpResponse::Ok().json(results)
}