public ActionResult <IEnumerable <Product> > GetAllProducts([FromQuery] Criterion criterion)
{
var products = ProductStub();
var numberOfProducts = products.Count();
var paginationMetadata = new
{
totalCount = numberOfProducts,
pageSize = criterion.PageSize,
currentPage = criterion.CurrentPage,
totalPages = criterion.GetTotalPages(numberOfProducts)
};
Response.Headers.Add("X-Pagination",
Newtonsoft.Json.JsonConvert.SerializeObject(paginationMetadata));
var links = CreateLinksForCollection(criterion, numberOfProducts);
var toReturn = products.Select(x => ExpandSingleFoodItem(x));
return(Ok(new
{
value = toReturn,
links
}));
}
public static void AddPaginateInfo(this HttpResponse httpResponse, Criterion criterion, int numberOfItems)
{
var paginationMetadata = new
{
totalCount = numberOfItems,
pageSize = criterion.PageSize,
currentPage = criterion.CurrentPage,
totalPages = criterion.GetTotalPages(numberOfItems)
};
httpResponse.Headers.Add("X-Pagination", JsonConvert.SerializeObject(paginationMetadata));
}
public static List <LinkItem> CreateLinksForCollection(this IUrlHelper urlHelper, string methodName,
Criterion criterion, int totalCount)
{
var links = new List <LinkItem>();
// self
links.Add(
new LinkItem(urlHelper.Link(methodName, new
{
pagecount = criterion.PageSize,
page = criterion.CurrentPage,
orderby = criterion.SortBy
}), "self", "GET"));
links.Add(new LinkItem(urlHelper.Link(methodName, new
{
pagecount = criterion.PageSize,
page = 1,
orderby = criterion.SortBy
}), "first", "GET"));
links.Add(new LinkItem(urlHelper.Link(methodName, new
{
pagecount = criterion.PageSize,
page = criterion.GetTotalPages(totalCount),
orderby = criterion.SortBy
}), "last", "GET"));
if (criterion.HasNext(totalCount))
{
links.Add(new LinkItem(urlHelper.Link(methodName, new
{
pagecount = criterion.PageSize,
page = criterion.CurrentPage + 1,
orderby = criterion.SortBy
}), "next", "GET"));
}
if (criterion.HasPrevious())
{
links.Add(new LinkItem(urlHelper.Link(methodName, new
{
pagecount = criterion.PageSize,
page = criterion.CurrentPage - 1,
orderby = criterion.SortBy
}), "previous", "GET"));
}
return(links);
}
private List <LinkItem> CreateLinksForCollection(Criterion criterion, int totalCount)
{
var links = new List <LinkItem>();
// self
links.Add(
new LinkItem(_urlHelper.Link(nameof(GetAllProducts), new
{
pagecount = criterion.PageSize,
page = criterion.CurrentPage,
orderby = criterion.SortBy
}), "self", "GET"));
links.Add(new LinkItem(_urlHelper.Link(nameof(GetAllProducts), new
{
pagecount = criterion.PageSize,
page = 1,
orderby = criterion.SortBy
}), "first", "GET"));
links.Add(new LinkItem(_urlHelper.Link(nameof(GetAllProducts), new
{
pagecount = criterion.PageSize,
page = criterion.GetTotalPages(totalCount),
orderby = criterion.SortBy
}), "last", "GET"));
if (criterion.HasNext(totalCount))
{
links.Add(new LinkItem(_urlHelper.Link(nameof(GetAllProducts), new
{
pagecount = criterion.PageSize,
page = criterion.CurrentPage + 1,
orderby = criterion.SortBy
}), "next", "GET"));
}
if (criterion.HasPrevious())
{
links.Add(new LinkItem(_urlHelper.Link(nameof(GetAllProducts), new
{
pagecount = criterion.PageSize,
page = criterion.CurrentPage - 1,
orderby = criterion.SortBy
}), "previous", "GET"));
}
return(links);
}