def generate_child_invoice(**kwargs):
"""
function to generate a new child invoice based upon the parent
"""
try:
parent = Invoice.objects.get(
invoice_number=kwargs['args']) # invoice instance
child = Invoice()
child.client = parent.client
child.tax = parent.tax
child.discount_rate = parent.discount_rate
child.issued_by = parent.issued_by
child.invoice_status = Invoice.INVOICE_STATUS[1][0]
child.recurring = Invoice.RECURRING[0][0]
child.parent_invoice = parent
child.date_due = timezone.now().date()
child.save()
# save the new m2m intermediary model
parent_units = Units.objects.filter(invoice=parent)
for item in parent_units.iterator():
new = Units()
new.invoice = child
new.item = item.item
new.quantity = item.quantity
new.save()
# generate pdf and send email (note: email=False, as already being dispatched due to creation of new PDF)
invoicing_view.pdf_gen_or_fetch_or_email(
invoice_number=child.invoice_number,
type=invoicing_view.PDF_TYPES.get('invoice'),
email=False,
regenerate=False)
return True
except Invoice.DoesNotExist:
return None
