deleteAll method
      
dynamic
deleteAll()
      
     
    
    
Implementation
deleteAll() {
  database().get().then((value) {
    for (var element in value.docs) {
      element.reference.delete();
    }
  });
}
deleteAll() {
  database().get().then((value) {
    for (var element in value.docs) {
      element.reference.delete();
    }
  });
}