billing.py 文件源码

def execute(self):
        """
        Execute the PreparedBillingAgreement by creating and executing a
        matching BillingAgreement.
        """
        # Save the execution time first.
        # If execute() fails, executed_at will be set, with no executed_agreement set.
        self.executed_at = now()
        self.save()

        with transaction.atomic():
            ret = BillingAgreement.execute(self.id)
            ret.user = self.user
            ret.save()
            self.executed_agreement = ret
            self.save()

        return ret