public async Task <long> AddCustomerAsync(Customer customer)
{
dbContext.Customers.Add(customer);
await dbContext.SaveChangesAsync();
return(customer.Id);
}
public Task AddCredit(decimal credit, int customerId)
{
if (credit <= 0)
{
throw new Exception($"Credit value must be a positive value!");
}
var customer = dbContext.Customers.FirstOrDefault(x => x.Id == customerId);
if (customer == null)
{
throw new Exception($"Customer wit {customerId} identifier not found!");
}
customer.Credit += credit;
return(dbContext.SaveChangesAsync());
}