52 lines
1.7 KiB
Python
52 lines
1.7 KiB
Python
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from django.db import transaction
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from registrasion import models as rego
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class CreditNoteController(object):
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def __init__(self, credit_note):
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self.credit_note = credit_note
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@classmethod
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def generate_from_invoice(cls, invoice, value):
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''' Generates a credit note of the specified value and pays it against
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the given invoice. You need to call InvoiceController.update_status()
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to set the status correctly, if appropriate. '''
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credit_note = rego.CreditNote.objects.create(
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invoice=invoice,
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amount=0-value, # Credit notes start off as a payment against inv.
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reference="ONE MOMENT",
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)
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credit_note.reference = "Generated credit note %d" % credit_note.id
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credit_note.save()
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return cls(credit_note)
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@transaction.atomic
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def apply_to_invoice(self, invoice):
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''' Applies the total value of this credit note to the specified
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invoice. If this credit note overpays the invoice, a new credit note
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containing the residual value will be created.
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Raises ValidationError if the given invoice is not allowed to be
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paid.
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'''
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from invoice import InvoiceController # Circular imports bleh.
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inv = InvoiceController(invoice)
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inv.validate_allowed_to_pay()
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# Apply payment to invoice
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rego.CreditNoteApplication.objects.create(
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parent=self.credit_note,
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invoice=invoice,
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amount=self.credit_note.value,
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reference="Applied credit note #%d" % self.credit_note.id,
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)
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inv.update_status()
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# TODO: Add administration fee generator.
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