public ActionResult <Post> AddPost(PostDTO post)
{
var owner = _userRepository.GetById(post.OwnerId);
if (owner == null)
{
return(NotFound());
}
Post newpost = new Post(post.Title, post.Body, owner);
_postRepository.Addpost(newpost);
_postRepository.SaveChanges();
return(CreatedAtAction(nameof(GetById), new { id = newpost.PostId }, newpost));
}