public static Paginated <TItem, TId> Empty <TItem, TId>(PaginationRequest <TId> request)
{
return(new Paginated <TItem, TId>
{
Pagination = new Pagination <TId>
{
Order = request.Order,
Cursor = request.Cursor
},
Items = ArraySegment <TItem> .Empty
});
}
public static Paginated <TItem, TId> Paginate <TItem, TId>(this IReadOnlyCollection <TItem> source,
PaginationRequest <TId> request,
IUrlHelper url,
Func <TItem, TId> idProjection)
{
return(new Paginated <TItem, TId>
{
Items = source,
Pagination = MapPaginationModel(request,
url,
source,
idProjection)
});
}
private static Pagination <TId> MapPaginationModel <TId, TItem>(PaginationRequest <TId> request,
IUrlHelper url,
IReadOnlyCollection <TItem> items,
Func <TItem, TId> idProjection)
{
var result = new Pagination <TId>
{
Count = items.Count,
Order = request.Order,
Cursor = request.Cursor,
};
if (items.Any() && items.Count == request.Limit)
{
request.Cursor = idProjection(items.Last());
result.NextUrl = BuildUrl(url, request);
}
return(result);
}
