public static Invoice createInvoice(User u, Plan p) {
Invoice i = new Invoice();
i.setUser(u);
i.setInvoiceDate(new Date());
i.insert();
InvoiceLine line = new InvoiceLine();
line.setName(p.getInvoiceLineName());
line.setDescription(p.getInvoiceLineDescription());
line.setQuantity(1);
line.setPrice(p.getMonthlyCost());
line.setParentInvoice(i);
line.insert();
return i;
}
