public static ModelPhoto AddPhoto(ModelPlace place, ModelUser user, string url, MainContext db)
{
if (!user.Equals(place.Author))
{
throw new UnauthorizedAccessException();
}
var photo = new ModelPhoto {
Place = place, Url = url
};
db.Photos.Add(photo);
place.Photos.Add(photo);
db.SaveChanges();
return(photo);
}