public async Task <bool> IsUserWithNameAvailableAsync(User user)
{
var users = await _persistanceService.GetAsync <User>(u => u.UserName == user.UserName);
return(users.FirstOrDefault() != null);
}
public async Task <IEnumerable <TItem> > GetItemsOfUserAsync <TItem>(int parentId) where TItem : BaseItem
{
return(await _persistenceService.GetAsync <TItem>(i => i.ParentId == parentId));
}