public async Task <IActionResult> OnGetWithId(int id)
{
if (!User.Identity.IsAuthenticated)
{
return(RedirectToPage("/Login"));
}
SingleCollection = await _collectionController.GetByIdAsync(id);
IsById = true;
var idString = User.Claims.FirstOrDefault(x => x.Type == ClaimTypes.NameIdentifier).Value;
var uid = int.Parse(idString);
var usr = await _userController.GetByIdAsync(uid);
IsInUserCollection = await _collectionController.IsInUserCollection(id, usr.Id);
return(Page());
}