Firebase.Xamarin的OrderBy（）方法不对数据进行排序

Question

This is a question about Firebase.Xamarin NuGet package. I'm using the statement await Client.Child(FirebaseKeys.Users).OrderBy("FirstName").OnceAsync<object>(); to sort the users by first name, but I don't get the users in sorted order. In the source code there is a comment stating that "this is used mainly for following filtering queries and due to firebase implementation the data may actually not be ordered." I'm not sure whether it's even possible to sort the data at all.

Answer 1

If you look at the Firebase.Xamarin Github Code, it clearly states in the method documentation as such:

        /// <summary>
        /// Order data by given <see cref="propertyName"/>. Note that this is used mainly for following filtering queries and due to firebase implementation
        /// the data may actually not be ordered.
        /// </summary>
        /// <param name="child"> The child. </param>
        /// <param name="propertyName"> The property name. </param>
        /// <returns> The <see cref="OrderQuery"/>. </returns>
        public static OrderQuery OrderBy(this ChildQuery child, string propertyName)
        {
            return child.OrderBy(() => propertyName);
        }

In effect, the data may not be sorted as required.