public ActionResult <IEnumerable <SongResult> > Get(SongResourceParameters parameters)
{
_logger.LogDebug("SongController.Get called with pageNumber {@pageNumber} and {@pageSize}", parameters.PageNumber, parameters.PageSize);
//TODO: Enable a way to retrieve child objects without returning the whole parent
var songbook = _repository.GetById(parameters.SongbookId);
if (songbook == null)
{
return(NotFound());
}
var songs = PagedList <SongResult> .Create(_mapper.Map <IEnumerable <SongResult> >(songbook.Songs.Skip(parameters.PageNumber - 1).Take(parameters.PageSize)), parameters.PageNumber, parameters.PageSize);
var paginationMetadata = new
{
totalCount = songs.TotalCount,
pageSize = songs.PageSize,
currentPage = songs.CurrentPage,
totalPages = songs.TotalPages
};
Response.Headers.Add("X-Pagination", JsonSerializer.Serialize(paginationMetadata));
var songResults = _mapper.Map <IEnumerable <SongResult> >(songs);
var collectionResult = new SongCollectionResult()
{
Results = songResults, Links = CreateLinksForSongs(parameters, songs.HasNext, songs.HasPrevious)
};
return(Ok(collectionResult));
}
private string CreateSongResourceUri(SongResourceParameters parameters, ResourceUriType type)
{
switch (type)
{
case ResourceUriType.PreviousPage:
return(Url.Link("GetSongs", new
{
pageNumber = parameters.PageNumber - 1,
pageSize = parameters.PageSize
}));
case ResourceUriType.NextPage:
return(Url.Link("GetSongs", new
{
pageNumber = parameters.PageNumber + 1,
pageSize = parameters.PageSize
}));
default:
return(Url.Link("GetSongs", new
{
pageNumber = parameters.PageNumber,
pageSize = parameters.PageSize
}));
}
}
private List <Link> CreateLinksForSongs(SongResourceParameters parameters, bool hasNext, bool hasPrevious)
{
var links = new List <Link>();
links.Add(new Link(CreateSongResourceUri(parameters, ResourceUriType.Current), "self", "GET"));
links.Add(new Link(CreateSongResourceUri(parameters, ResourceUriType.Current), "delete_song", "DELETE"));
if (hasNext)
{
links.Add(new Link(CreateSongResourceUri(parameters, ResourceUriType.NextPage), "next_page", "GET"));
}
if (hasPrevious)
{
links.Add(new Link(CreateSongResourceUri(parameters, ResourceUriType.PreviousPage), "previous_page", "GET"));
}
return(links);
}
