public async Task <IActionResult> Attach(Int32 topicId, int messageId, [FromForm] FormFileCollection attachments)
{
var message = await context.ForumMessages
.Include(m => m.ForumTopic)
.SingleOrDefaultAsync(m => m.Id == messageId);
if (message is null)
{
return(NotFound());
}
var authResult = await authorizationService.AuthorizeAsync(User, message.Id, "MessageAuthor");
if (!authResult.Succeeded)
{
return(Unauthorized());
}
if (!attachments.Any())
{
ModelState.AddModelError("attachments", "Attachments cannot be empty.");
return(View(message));
}
var files = new List <ForumMessageAttachment>();
foreach (var attachment in attachments)
{
files.Add(new ForumMessageAttachment
{
Created = DateTime.Now,
FileName = attachment.FileName,
FilePath = await CreateFile(attachment)
});
}
try
{
message.Attachments = files;
context.Entry(message).Collection(e => e.Attachments).IsModified = true;
await context.SaveChangesAsync();
}
catch (Exception)
{
throw;
}
return(RedirectToActionPermanent("Index", new { topicId }));
}