account-financial-reporting/account_financial_report_qweb/models/account_group.py

# coding: utf-8
# Copyright 2018 Eficent
# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).

from odoo import api, fields, models


class AccountGroup(models.Model):
    _inherit = 'account.group'

    group_child_ids = fields.One2many(
        comodel_name='account.group',
        inverse_name='parent_id',
        string='Child Groups')

    compute_account_ids = fields.Many2many(
        'account.account',
        compute='_compute_group_accounts',
        string="Accounts", store=True)

    @api.multi
    @api.depends('code_prefix', 'account_ids', 'account_ids.code',
                 'group_child_ids', 'group_child_ids.account_ids.code')
    def _compute_group_accounts(self):
        account_obj = self.env['account.account']
        accounts = account_obj.search([])
        for group in self:
            prefix = group.code_prefix if group.code_prefix else group.name
            gr_acc = accounts.filtered(
                lambda a: a.code.startswith(prefix)).ids
            group.compute_account_ids = [(6, 0, gr_acc)]