DO NOT MERGE

used for debugging

__manifest__.py

@@ -17,6 +17,8 @@
         # datas
         # views
         "views/company_share_line.xml",
+        # next line used for debugging
+        # "views/financial_contract_external.xml",
         "views/financial_contract_guarantee.xml",
         "views/financial_contract_guarantee_commission.xml",
         "views/financial_contract_guarantee_line.xml",

models/__init__.py

@@ -10,3 +10,4 @@ from . import mutual_guarantee_fund_line
 from . import res_company
 from . import res_config_settings
 from . import res_partner
+from . import financial_contract_external

models/financial_contract_external.py

+# © 2024 Le Filament (<http://www.le-filament.com>)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+from odoo import fields, models, api
+
+
+class FinancialContractExternal(models.Model):
+    _inherit = "financial.contract.external"
+
+    # there should be a single guarantee but we do not ensure this
+    # useful for debugging
+    guarantee_ids = fields.One2many(
+        string="Garanties",
+        comodel_name="financial.contract.guarantee",
+        inverse_name="external_loan_id"
+    )
+
+    # only used for debugging
+    guarantee_count = fields.Integer("Nombre de garanties liées", compute="_compute_guarantee_count")
+
+    @api.depends("guarantee_ids")
+    def _compute_guarantee_count(self):
+        for i in self:
+            i.guarantee_count = len(i.guarantee_ids)

views/financial_contract_external.xml

+<?xml version="1.0" ?>
+<!-- Copyright 2024 Le Filament
+     License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl). -->
+<odoo>
+
+    <!-- Form -->
+    <record model="ir.ui.view" id="financial_contract_external_form_view_inherit">
+        <field name="name">financial.contract.external.form.inherit</field>
+        <field name="model">financial.contract.external</field>
+        <field name="inherit_id" ref="financial_contract_external.financial_contract_external_form_view"/>
+        <field name="arch" type="xml">
+            <xpath expr="//field[@name='comment']/.." position="after">
+                <group>
+                    <field name="guarantee_ids"/>
+                </group>
+            </xpath>
+        </field>
+    </record>
+
+    <!-- Tree -->
+    <record model="ir.ui.view" id="financial_contract_external_tree_view_inherit">
+        <field name="name">financial.contract.external.list.inherit</field>
+        <field name="model">financial.contract.external</field>
+        <field name="inherit_id" ref="financial_contract_external.financial_contract_external_tree_view"/>
+        <field name="arch" type="xml">
+            <xpath expr="//field[@name='number']" position="after">
+                <field name="guarantee_count" optional="hide"/>
+            </xpath>
+        </field>
+    </record>
+
+</odoo>