public async Task <int> PurchaseTransportCard(int load)
{
if (load < _initialLoadAmount || load > _maxLoadAmount)
{
throw new Exception($"Initial load must be {_initialLoadAmount} or higher but less than {_maxLoadAmount}");
}
var transportCard = new TransportCard
{
Load = load
};
_context.Add(transportCard);
if (await _context.SaveChangesAsync() <= 0)
{
throw new Exception("Purchasing card failed");
}
return(transportCard.Id);
}
