/// <summary>
/// Multisorts an enumeration of posts applied in order
/// </summary>
/// <param name="posts"></param>
/// <param name="options"></param>
/// <returns>sorted posts</returns>
public static IEnumerable <Post> SortBy(this IEnumerable <Post> posts, SortOptions options)
{
if (options == null)
{
return(posts);
}
var sorters = options.GetKeyValuePairs()
.Where(sorter =>
{
var validSorterProperties = new string[] { "pricePerUnit", "price" };
if (!validSorterProperties.Contains(sorter.Key))
{
return(false);
}
var validSorterOrder = new string[] { "asc", "desc" };
if (!validSorterOrder.Contains(sorter.Value))
{
return(false);
}
return(true);
});
return(sorters.Count() <= 0
? posts
: posts.Aggregate(new List <Post>(), (acc, post) =>
{
acc.Add(post);
foreach (var sorter in sorters)
{
var sorterType = sorter.Value;
if (sorter.Key == "pricePerUnit")
{
if (sorterType == "asc")
{
acc = acc.OrderBy(post => post.PricePerUnit).ToList();
}
if (sorterType == "desc")
{
acc = acc.OrderByDescending(post => post.PricePerUnit).ToList();
}
}
if (sorter.Key == "price")
{
if (sorterType == "asc")
{
acc = acc.OrderBy(order => order.Article.Price).ToList();
}
if (sorterType == "desc")
{
acc = acc.OrderByDescending(order => order.Article.Price).ToList();
}
}
}
return acc;
}));
}
