public HashtagController(OmissionContext context, HashtagService hashtagService)
{
_context = context;
_hashtagService = hashtagService;
}
public HashtagController(HashtagService service)
{
_service = service;
}
public async Task <int> CreatePostAsync(CreatePostDto createPostDto)
{
if (createPostDto == null ||
createPostDto.ImageIds == null ||
!createPostDto.ImageIds.Any() ||
createPostDto.ImageIds.Count > 10)
{
throw new ArgumentOutOfRangeException("Post must contain from 1 to 10 pictures.");
}
if (createPostDto.Description == null)
{
createPostDto.Description = string.Empty;
}
using (var transaction = _photoSNDbContext.Database.BeginTransaction())
{
try
{
var user = await _photoSNDbContext.Users
.FirstOrDefaultAsync(u => u.Id == createPostDto.UserId);
if (user == null)
{
throw new ArgumentException($"User with id {createPostDto.UserId} does not exist.");
}
var images = await _photoSNDbContext.Images
.Include(i => i.User)
.Where(i => createPostDto.ImageIds.Contains(i.ImageId) && i.User.Id == createPostDto.UserId)
.ToListAsync();
if (images.Count != createPostDto.ImageIds.Count)
{
throw new ArgumentException("All images must be presented in DB and be uploaded by the same user who is creating the post.");
}
var post = new Post
{
User = user,
Description = createPostDto.Description,
Created = DateTime.Now
};
await _photoSNDbContext.Posts.AddAsync(post);
byte orderNumber = 1;
foreach (var image in images)
{
var postImage = new PostImage
{
Image = image,
OrderNumber = orderNumber,
Post = post
};
await _photoSNDbContext.PostImages.AddAsync(postImage);
orderNumber++;
}
var hashtags = HashtagService.GetHashtags(createPostDto.Description);
foreach (var hashtag in hashtags)
{
var existingHashtag = await _photoSNDbContext.Hashtags
.FirstOrDefaultAsync(h => h.Text == hashtag);
var inPostHashtag = new InPostHashtag();
if (existingHashtag == null)
{
var newHashtag = new Hashtag {
Text = hashtag
};
_photoSNDbContext.Hashtags.Add(newHashtag);
inPostHashtag.Hashtag = newHashtag;
}
else
{
inPostHashtag.Hashtag = existingHashtag;
}
inPostHashtag.Post = post;
_photoSNDbContext.InPostHashtags.Add(inPostHashtag);
}
await _photoSNDbContext.SaveChangesAsync();
await transaction.CommitAsync();
return(post.PostId);
}
catch (Exception e)
{
transaction.Rollback();
throw e;
}
}
}
