public async Task <ActionResult <PaginatedItemsViewModel <EmailDTO> > > ItemsAsync(
[FromQuery] int pageSize = 10,
[FromQuery] int pageIndex = 0,
[FromQuery] Dictionary <string, string> filter = default,
[FromQuery] Dictionary <string, int> sorting = default,
CancellationToken cancellation = default)
{
var filterSpec = GenerateFilter(filter);
var totalItems = await _emailService.CountAsync(filterSpec, cancellation);
var pagedFilterSpec = GenerateFilter(filter, pageSize, pageIndex);
var sortingSpec = GenerateSortingSpec(sorting);
var items = await _emailService.ListAsync(pagedFilterSpec, sortingSpec, cancellation);
var model = new PaginatedItemsViewModel <EmailDTO>(pageIndex, pageSize, totalItems, items.Select(_mapper.Map <EmailDTO>));
return(Ok(model));
}