public ActionResult <PagedCollectionResponse <BookDto> > GetBooks([FromQuery] BooksFilterModel filter)
{
//Get the data for the current page
var result = new PagedCollectionResponse <BookDto>
{
Items = _bookService.GetFilteredBooks(filter)
};
if (!result.Items.Any())
{
return(NoContent());
}
//Get next page URL string
BooksFilterModel nextFilter = filter.Clone() as BooksFilterModel;
nextFilter.Page += 1;
string nextUrl = !_bookService.GetFilteredBooks(nextFilter).Any()
? null
: Url.Action("GetBooks", null, nextFilter, Request.Scheme);
//Get previous page URL string
BooksFilterModel previousFilter = filter.Clone() as BooksFilterModel;
previousFilter.Page -= 1;
string previousUrl = previousFilter.Page <= 0
? null
: Url.Action("GetBooks", null, previousFilter, Request.Scheme);
result.NextPage = !IsNullOrWhiteSpace(nextUrl) ? new Uri(nextUrl) : null;
result.PreviousPage = !IsNullOrWhiteSpace(previousUrl) ? new Uri(previousUrl) : null;
return(Ok(result));
}
public IEnumerable <BookDto> GetFilteredBooks(BooksFilterModel filterModel)
{
//Filtering logic
var books = _db.Books.Include(b => b.Author)
.Include(b => b.Publisher)
.Where(b => b.Title.StartsWith(filterModel.Title ??
Empty, InvariantCultureIgnoreCase))
.Where(b => b.Author.Name.StartsWith(filterModel.AuthorName ??
Empty, InvariantCultureIgnoreCase))
.Skip((filterModel.Page - 1) * filterModel.Limit)
.Take(filterModel.Limit);
return(_mapper.Map <IEnumerable <Book>, IEnumerable <BookDto> >(books));
}