/// <summary>
/// Order then by the string expression provided.
/// </summary>
/// <param name="query">The IOrderedQueryable to add additional sorting to.</param>
/// <param name="propertyName">The path to the property to order by (e.g. Path.To.Property).</param>
/// <param name="direction">Order by which to sort items.</param>
/// <typeparam name="T"></typeparam>
/// <returns></returns>
public static IOrderedQueryable <T> ThenBy <T>(
this IOrderedQueryable <T> query,
string propertyName,
OrderByDirection direction = OrderByDirection.Ascending
) => query.AppendOrderByExpression(propertyName, direction, true);