public async Task<JsonNetResult> ByUser(GetUserCommentsViewModel model)
{
// If no user was specified, default to the current logged in user
Guid? userId = model.UserId ?? User.GetCurrentUserId();
if (userId == null)
{
ModelState.AddModelError(string.Empty, "No user specified and no user currently logged in.");
return JsonFailure();
}
// Get a page of comments for the user, then look up video details for those videos
UserComments result = await _comments.GetUserComments(new GetUserComments
{
UserId = userId.Value,
PageSize = model.PageSize,
FirstCommentIdOnPage = model.FirstCommentIdOnPage
});
// For the ViewModel, we want to add information about the video to each comment as well, so get the video preview
// information for the comments and then use a LINQ to objects Join to merge the two together (this should be OK since
// the dataset should be small since we're doing a page at a time)
IEnumerable<VideoPreview> videoPreviews = await _videoCatalog.GetVideoPreviews(result.Comments.Select(c => c.VideoId).ToHashSet());
var returnModel = new UserCommentsViewModel
{
UserId = result.UserId,
Comments = result.Comments.Join(videoPreviews, c => c.VideoId, vp => vp.VideoId, (c, vp) => new UserCommentViewModel
{
CommentId = c.CommentId,
Comment = c.Comment,
CommentTimestamp = c.CommentTimestamp,
VideoViewUrl = Url.Action("View", "Videos", new { videoId = c.VideoId }),
VideoName = vp.Name,
VideoPreviewImageLocation = vp.PreviewImageLocation
}).ToList()
};
return JsonSuccess(returnModel);
}
