如何将子集合添加到 firebase 中新创建的文档？

Question

I'm creating an importer for some documents in firebase.

I need to have a sub collection(not just an array) for a specific property of each document I add.

Currently I've the following code, which doesn't seems to work:

let rawdata = fs.readFileSync("files/" + file);
let spot = JSON.parse(rawdata);
var spotFirebase = {
    id: spot.Id,
    sourceId: spot.SourceId,
    type: spot.Type,
    location: new firebase.firestore.GeoPoint(spot.Latitude, spot.Longitude),
    description: spot.Description,
    address: spot.Address,
    city: spot.City,
    country: spot.Country,
    price: spot.Price,
    parkingCost: spot.ParkingCost,
    opening: spot.Opening,
    name: spot.Name,
    features: spot.Features,
    activities: spot.Activities,
    rating: {
        ratingCount: spot.Rating.RatingCount,
        ratingAverage: spot.Rating.RatingAverage
    }
}

db.collection("spots").add(spotFirebase).then(function (docRef) {
    console.log("Document ", file, " written with ID: ", docRef.id, ", index: ", index, ". ", spot.Rating.UserRatings.length);

    spot.Rating.UserRatings.forEach(ur =>
        docRef.collection("userRatings").add(
            {
                date: ur.Date,
                username: ur.UserName,
                review: ur.Review,
                note: ur.Note,
                reviewSource: ur.ReviewSource
            }).then(function (subDocRef) {
                console.log("Review ID  ", subDocRef.id, " written");
            }).catch(function (errorReview) {
                console.error("Error adding document: ", errorReview);
            }));
})
.catch(function (error) {
    console.error("Error adding document: ", error);
});

1. I've no Error displayed
2. I've never the message "Review ID ... written"
3. Obviously, I end with the spot document written, but without any user rating.

I guess I'm not adding correctly the sub collection properly.

What did I do wrong?

Answer 1

The code wasn't waiting for the additions to the sub collection to complete before terminating.

This edit factors the addition into the subcollection into a testable function, collects the promises to create each new doc in a promises array, then waits for all of those ( Promise.all() ) to complete before terminating...

function addUserRating(parentRef, ur) {
  const newDoc = {
    date: ur.Date,
    username: ur.UserName,
    review: ur.Review,
    note: ur.Note,
    reviewSource: ur.ReviewSource
  }
  return parentRef.collection("userRatings").add(newDoc).then(result => {
    console.log("Review ID  ", result.path, " written");
    return result
  })
}

db.collection("spots").add(spotFirebase).then(function (docRef) {
  console.log("Document ", file, " written with ID: ", docRef.id, ", index: ", index, ". ", spot.Rating.UserRatings.length);
  let promises = spot.Rating.UserRatings.map(ur => addUserRating(docRef, ur))
  return Promise.all(promises)
}).catch(function (error) {
  console.error("Error adding document(s): ", error)
})