Mongoose - Return a single document instead of an array of documents with Aggregate

Question

Before starting to use aggregate in order to create a timestamp of the document, I was using findOne so I could get a single object but now I\'m getting an array with a single o

Answer 1

Aggregate method returns an array; this is the defined behavior. If you want to adapt this behavior to your way, you can either re-create your own aggregate function; or deal with the array at every call; like :

async function aggregate(model, func) {
  const aggregateObject = func(News.aggregate());

  const ret = await aggregateObject.exec();

  // Deal with the fact there is no answer
  if (ret && ret.length) {
    return ret[0];
  }

  return false;
}

const directData = await aggregate(News, (aggregateObj) => {
  return aggregateObj
    .match(...)
    .project(...);
});