Question 184810 in Flutter Question posted in
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Can not read firebase collection with user id with Flutter web, while there is not problem on mobile flutter

I have flutter mobile and flutter web using same firebase firestore. But somehow I can not read all data from web.

final collection = FirebaseFirestore.instance.collection(_allReports);      
print('* * * allReports - ${(await collection.get()).docs.length}');

on output 0, while there is a two item showed on above screen shot.
I had some experience, if I create item with random symbols instead of user id, it works. And if try to get reports by providing whole path ‘all_reports/user_id/reports/’ it works also.

firebase

Rules:

service cloud.firestore {
  match /databases/{database}/documents {
    match /{document=**} {
      allow read, write: if isUserAuthenticated();
    }
    match /all_reports/{document=**} {
        allow read: if true;
    }
    
    /* Functions */
    function isUserAuthenticated() {
      return request.auth.uid != null; 
    }
  }
}

Can anyone solve this?

Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0

    I found the solution! It is easier than I thought.

    final groupReportCollections = fb.collectionGroup(_reports);
groupReportCollections.get().then((value) 
=> value.docs.forEach((e) => log('item: ${e.data()}')));

  2. 0

    Look at how your documents are displayed in an italic font: This means that these documents are only present as "container" of one or more sub-collection but that they are not "genuine" documents.

    They are shown in the Firestore console (in italic) for you to be able to open the subcollection (i.e. reports) but they actually don’t exist, hence the value of 0 for docs.length (the QuerySnapshot returned by the query is empty).

    And this also explains why you get a non empty QuerySnapshot when you query the subcollection with the following path: all_reports/user_id/reports/.

    If you want to query the all_reports collection you need to create the corresponding documents. But are you sure you need to query this collection?

    Update following your comment:

    I want to get all reports of all users

    You can use a Collection Group query.: A Collection Group consists of all collections with the same ID (i.e. reports in your case).

    Note that if you need the user’s uid for each report (i.e. the "fake" parent document), you can use the approach explained in this SO answer, i.e. getting the parent ref of the report document (it is the reports subcollection for the user) and then the parent document of this subcollection.

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