public async Task <int> Create <TModel>(TModel model)
{
var query = new EnumerableQuery <TModel>(new[] { model });
var task = query.To <TraineeTask>().SingleOrDefault();
await this.taskRepository.AddAsync(task);
await this.taskRepository.SaveChangesAsync();
// ReSharper disable once PossibleNullReferenceException
return(task.Id);
}