subscription_request.py

from odoo import api, models, fields, _
from odoo.exceptions import ValidationError


class SubscriptionRequest(models.Model):
    _inherit = 'subscription.request'

    mandate_id = fields.Many2one(
        "account.banking.mandate",
        string="Direct Debit Mandate",
        ondelete="restrict",
        check_company=True,
        readonly=False,
        domain="[('state', 'in', ('draft', 'valid')), ('partner_id', '=', partner_id)]",
    )
    mandate_required = fields.Boolean(
        related="payment_mode_id.payment_method_id.mandate_required",
    )
    mandate_approved = fields.Boolean(required=True, default=False, string="Approved creation of new mandate")

    def create_invoice(self, partner):
        if self.mandate_required and not self.mandate_id:
            self.mandate_id = self.create_mandate()
        return super(SubscriptionRequest, self).create_invoice(partner)

    def create_mandate(self):
        if not self.partner_id:
            raise ValidationError(_('Must assign a valid cooperator.'))
        if not self.mandate_approved:
            raise ValidationError(_('Must check the mandate creation.'))
        return self.env['account.banking.mandate'].create(
            self.get_mandate_values()
        )

    def get_invoice_vals(self, partner):
        vals = super(SubscriptionRequest, self).get_invoice_vals(partner)
        vals["mandate_id"] = self.mandate_id.id
        return vals

    def get_bank(self):
        if not self.iban:
            raise ValidationError(_('Must assign a valid iban.'))
        bank_id = self.partner_id.bank_ids.search([('acc_number', '=', self.iban)])  # TODO normalize iban
        if bank_id:
            return bank_id
        return self.env['res.partner.bank'].create(
            {
                'partner_id': self.partner_id.id,
                'acc_number': self.iban,
            }
        )

    def get_mandate_values(self):
        bank_id = self.get_bank()
        return {
            'format': 'sepa',
            'type': 'recurrent',
            'state': 'valid',
            'signature_date': self.date,
            'partner_bank_id': bank_id.id,
            'partner_id': self.partner_id.id,
            'company_id': self.company_id.id,
        }

    @api.onchange("partner_id")
    def onchange_partner(self):
        super(SubscriptionRequest, self).onchange_partner()
        self.mandate_id = False