public IActionResult GetCommentariesForTopic(Guid topicId, CommentariesResourceParameters commentariesResourceParameters)
{
var commentaryEntities = noterRepository.GetCommentariesForTopic(topicId, commentariesResourceParameters);
var commentaryDtos = Mapper.Map <IEnumerable <CommentaryDto> >(commentaryEntities);
var previousPageLink = commentaryEntities.HasPrevious ?
CreateCommentariesResourceUri(commentariesResourceParameters, ResourceUriType.PreviousPage)
: null;
var nextPageLink = commentaryEntities.HasNext ?
CreateCommentariesResourceUri(commentariesResourceParameters, ResourceUriType.NextPage)
: null;
var paginationMetadata = new
{
totalCount = commentaryEntities.TotalCount,
pageSize = commentaryEntities.PageSize,
currentPage = commentaryEntities.CurrentPage,
totalPages = commentaryEntities.TotalPages,
previousPage = previousPageLink,
nextPage = nextPageLink
};
Response.Headers.Add("X-Pagination", JsonConvert.SerializeObject(paginationMetadata));
return(Ok(commentaryDtos));
}
private string CreateCommentariesResourceUri(CommentariesResourceParameters commentariesResourceParameters, ResourceUriType resourceUriType)
{
switch (resourceUriType)
{
case ResourceUriType.PreviousPage: return(urlHelper.Link("GetCommentariesForTopic",
new
{
pageNumber = commentariesResourceParameters.PageNumber - 1,
pageSize = commentariesResourceParameters.PageSize
}));
case ResourceUriType.NextPage: return(urlHelper.Link("GetCommentariesForTopic",
new
{
pageNumber = commentariesResourceParameters.PageNumber + 1,
pageSize = commentariesResourceParameters.PageSize
}));
default:
return(urlHelper.Link("GetCommentariesForTopic",
new
{
pageNumber = commentariesResourceParameters.PageNumber,
pageSize = commentariesResourceParameters.PageSize
}));
}
}
public PagedList <Commentary> GetCommentariesForTopic(Guid topicId, CommentariesResourceParameters commentariesResourceParameters)
{
var query = context.Commentaries.Where(e => e.TopicId == topicId);
return(PagedList <Commentary> .Create(query, commentariesResourceParameters.PageNumber, commentariesResourceParameters.PageSize));
}
