How do you store extra information of files stored in Cloud Storage for Firebase with Flutter

user_13400206 0
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I'm trying to store some files in Firebase storage and when the user accesses or downloads those files, I want to show some extra information about each file (such as a description, date, etc). File metadata can only store name, size and contentType so where and how can I store the extra information?

google-cloud-storage firebase flutter
2 Answers

As explained in the doc, when uploading a file you can add some "custom metadata" via the SettableMetadata Class, as follows:

  // Create your custom metadata.
  firebase_storage.SettableMetadata metadata =
      firebase_storage.SettableMetadata(
        cacheControl: 'max-age=60',
        customMetadata: <String, String>{
          'userId': 'ABC123',
        },
      );

  try {
    // Pass metadata to any file upload method e.g putFile.
    await firebase_storage.FirebaseStorage.instance
        .ref('uploads/file-to-upload.png')
        .putFile(file, metadata);
  } on firebase_core.FirebaseException catch (e) {
    // e.g, e.code == 'canceled'
  }
user_33718620

You can use custom meta along with file in firebase storage like the other answer, or you could create a firestore document for it. Let me know if you need some sample code

user_138589910
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