public IActionResult GetAnnouncements([FromQuery] AnnouncementsResourceParameters announcementsResourceParameters)
{
if (!_typeHelperService.TypeHasProperties <AnnouncementForGetting>(announcementsResourceParameters.Fields))
{
return(BadRequest());
}
var announcementsFromDb = _announcementsRepository.GetAnnouncements(announcementsResourceParameters);
var previousPageLink = announcementsFromDb.HasPrevious ?
CreateAnnouncementsResourceUri(announcementsResourceParameters, ResourceUriType.PreviousPage) : null;
var nextPageLink = announcementsFromDb.HasNext ?
CreateAnnouncementsResourceUri(announcementsResourceParameters, ResourceUriType.NextPage) : null;
var paginationMetadata = new
{
totalCount = announcementsFromDb.TotalCount,
pageSize = announcementsFromDb.PageSize,
currentPage = announcementsFromDb.CurrentPage,
totalPages = announcementsFromDb.TotalPages,
previousPageLink,
nextPageLink
};
Response.Headers.Add("X-Pagination", JsonConvert.SerializeObject(paginationMetadata));
var announcementsForGetting = Mapper.Map <IEnumerable <AnnouncementForGetting> >(announcementsFromDb);
return(Ok(announcementsForGetting.ShapeData(announcementsResourceParameters.Fields)));
}
private string CreateAnnouncementsResourceUri(AnnouncementsResourceParameters announcementsResourceParameters, ResourceUriType type)
{
switch (type)
{
case ResourceUriType.PreviousPage:
return(_urlHelper.Link("GetAnnouncements", new
{
fields = announcementsResourceParameters.Fields,
searchString = announcementsResourceParameters.SearchString,
pageNumber = announcementsResourceParameters.PageNumber - 1,
pageSize = announcementsResourceParameters.PageSize
}));
case ResourceUriType.NextPage:
return(_urlHelper.Link("GetAnnouncements", new
{
fields = announcementsResourceParameters.Fields,
searchString = announcementsResourceParameters.SearchString,
pageNumber = announcementsResourceParameters.PageNumber + 1,
pageSize = announcementsResourceParameters.PageSize
}));
default:
return(_urlHelper.Link("GetAnnouncements", new
{
fields = announcementsResourceParameters.Fields,
searchString = announcementsResourceParameters.SearchString,
pageNumber = announcementsResourceParameters.PageNumber,
pageSize = announcementsResourceParameters.PageSize
}));
}
}
public PagedList <Announcement> GetAnnouncements(AnnouncementsResourceParameters announcementsResourceParameters)
{
var collectionFromDb = _context.Announcements
.OrderByDescending(a => a.VipAnnouncement)
.ThenBy(a => a.Title).AsQueryable();
if (!string.IsNullOrEmpty(announcementsResourceParameters.SearchString))
{
var normalizedSearchString = announcementsResourceParameters.SearchString.Trim().ToLowerInvariant();
collectionFromDb = collectionFromDb.Where(a => a.Title.ToLowerInvariant().Contains(normalizedSearchString));
}
return(PagedList <Announcement> .Create(collectionFromDb, announcementsResourceParameters.PageNumber, announcementsResourceParameters.PageSize));
}
