public async Task <InvoiceWithClient> GenerateInvoiceForNewClientAsync(Invoice invoice, Client client)
{
var clientWithId = await clients.CreateAsync(client);
invoice.Client_uid = clientWithId.Id;
var invoiceWithId = await invoices.CreateAsync(invoice);
return(new InvoiceWithClient
{
Client = clientWithId,
Invoice = invoiceWithId,
});
}