I am having trouble defining path for Firebase cloud storage. I would like it to be -

user id -> firestore doc id -> folder's name.

currently, I successfully save the images in this way.

class FirebaseStorageService {
final String imageName;
FirebaseStorageService({required this.imageName});

  get imageFileName =>
      imageName   DateTime.now().millisecondsSinceEpoch.toString();

//get firestore doc id  
final postid = FirebaseFirestore.instance.collection('properties').doc().id;

//get user id
final String? userid = FirebaseAuth.instance.currentUser!.uid;

  //! Upload gallery
  Future<String> saveGalleryInCloudStorage({
    required File file,
  }) async =>
      await upload(
          file: file,
          path: '$userid/$postid/Property Gallery/$imageFileName',
          contentType: 'image/png');


  /// Generic file upload for any [path] and [contentType]
  Future<String> upload({
    required File file,
    required String path,
    required String contentType,
  }) async {
    final storageReference = FirebaseStorage.instance.ref().child(path);
    final uploadTask = storageReference.putFile(
        file, SettableMetadata(contentType: contentType));
    final snapshot = await uploadTask;
    final downloadUrl = await snapshot.ref.getDownloadURL();
    return downloadUrl;
  }
}

However, the problem I am having is the postid (that is used in firebase cloud storage path) is not same with firestore doc id.

How do I make them to be the same? Thanks in advance!!

CodePudding user response：

.collection('properties').doc() the doc is empty hence firebase generates an auto id.

What you can do is Create an empty doc get a doc id, use the id to save the file, and when saving your firestore doc just update the empty doc

1. create empty doc

final documentReference = await FirebaseFirestore.instance.collection('mycoll').add({'id':''});

2. use doc id to save file obtained from documentReference.id

makes this redudant

//get firestore doc id  
final postid = FirebaseFirestore.instance.collection('properties').doc().id;

3. on done saving file , save your doc with the id above

FirebaseFirestore.instance.collection('properties').doc(documentReference.id)
        .set(servicemodel.toJson());```

CodePudding user response：

You can upload Image and update fields related withthis function. Its work for me.

static String staticImagePath= "";
 final FirebaseAuth _auth = FirebaseAuth.instance;
  File? file;

  Future uploadImageToFirebaseStorage() async {
        var _user = _auth.currentUser!.uid;
     
    
        var _propertiesCollection= FirebaseFirestore.instance
            .collection('Properties')
            .where('postId', isEqualTo: _user);
        var querySnapshots = await _propertiesCollection.get();
    
        try {
          var _image = await ImagePicker().pickImage(source: ImageSource.gallery);
          file = File(_image!.path);
          firebase_storage.Reference _refPath = firebase_storage
              .FirebaseStorage.instance
              .ref()
              .child('MyImageRepo')
              .child(_auth.currentUser!.uid);
          firebase_storage.UploadTask _uploadTask = _refPath.putFile(file!);
    
          String _url = await (await _uploadTask).ref.getDownloadURL();
          staticImagePath = _url.toString();
    
          await _propertiesCollection.doc(_auth.currentUser!.uid).update(({
                'postId': staticImagePath,
              }));
         
        } catch (e) {
          return Center(child: Text(e.toString()));
        }

  }