WEBPACK_IMPORTED_MODULE_3 CollectionGroup is not a function - firebase collection group querying nes-CodePudding

Prompt: There are 5 products. Each product has 5 video reviews. These reviews are nested in the following data structure.

products > docs > productReviewClips > docs {videoUrl: https://videoclip.mp4, uid: 1234}.

Each productReviewClips doc has a videoUrl.

Am I querying the videoUrls from all the products the wrong way?

const [feed, setFeed] = useState([]);

useEffect(() => { 
        firestore.collection('products').doc().collectionGroup('productReviewClips')
        .onSnapshot((snapshot) => {
            // console.log(JSON.stringify(snapshot)   "1")

            setFeed([...snapshot.docs.map((doc) => {
                return {
                    ...doc.data(),
                    documentID: doc.id,
                };
            })
        ])

        })
        },
   [])

CodePudding user response：

When you call doc() without arguments, it generates a new unique ID. For a collection group query, skip the initial collection('products').doc() altogether and do:

firestore.collectionGroup('productReviewClips')...

The collectionGroup function is a part of the Firestore object, it's not available on a CollectionReference or DocumentReference object which is also why you get the "not a function" error.

If you want to search only productReviewClips collections under a specific path, that is possible with a trick Sam explains here: CollectionGroupQuery but limit search to subcollections under a particular document