set invoice state = paid programmatically

Question

we know about register-payment and account_payment module....
but regardless of this odoo method we want to change the state of an invoice to paid.
in our custom Method we use:
self.write({'state':'paid'})
But the state in the Database seems to be unchanged.
any ideas why this fails?

Zbik · Answer

Probably because the *_write* method in account_invoice (exact action_invoice_paid method called here) recalculates this field and *sets it up in its own way*.
You modify write method in account_invoice, like this (but ... think about whether you do well by setting this status yourself):
@api.multi
def write(self, vals):
ret = super(AccountInvoice, self).write(vals)
... your logic here ...
return ret

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