account-financial-tools/account_loan/model/account_move.py

# Copyright 2018 Creu Blanca
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).

from odoo import api, fields, models


class AccountMove(models.Model):
    _inherit = 'account.move'

    loan_line_id = fields.Many2one(
        'account.loan.line',
        readonly=True,
        ondelete='restrict',
    )
    loan_id = fields.Many2one(
        'account.loan',
        readonly=True,
        store=True,
        ondelete='restrict',
    )

    @api.multi
    def post(self, invoice=False):
        res = super().post(invoice=invoice)
        for record in self:
            loan_line_id = record.loan_line_id or (
                invoice and invoice.loan_line_id
            )
            if loan_line_id:
                if not record.loan_line_id:
                    record.loan_line_id = loan_line_id
                record.loan_id = loan_line_id.loan_id
                record.loan_line_id.check_move_amount()
                record.loan_line_id.loan_id.compute_posted_lines()
                if record.loan_line_id.sequence == record.loan_id.periods:
                    record.loan_id.close()
        return res