def create(self, client_id, invoice_no, invoice_date, sale_date, currency_id = None, language_id = None):
'''
Create a new invoice
'''
self._invoice_items = []
client = ClientManager.find_by_id(client_id)
if currency_id is None:
currency = client.default_currency
else:
currency = CurrencyManager.find_by_id(currency_id)
if language_id is None:
language = client.default_language
else:
language = LanguageManager.find_by_id(language_id)
self._invoice = InvoiceEntity.create(
user = self._user,
client = client,
currency = currency,
language = language,
invoice_no = invoice_no,
invoice_date = invoice_date,
sale_date = sale_date
)
return self._invoice
