_checkbidder() async {
  var result = await databases!
      .listDocuments(collectionId: Appconstants.collectionID2, queries: [
    Query.equal('bidderNumber', ['${user!.id}'])
  ]);
  if (result.total == 0) {
    createbidder();
  }
}

createbidder() async {
  try {
    var result = await databases!.createDocument(
      collectionId: Appconstants.collectionID2,
      documentId: 'unique()',
      data: {
        'bidderNumber': user!.id,
      },
    );
  } catch (e) {
    rethrow;
  }
}