[IMP] contract: Add contract modification

contract/models/contract.py

@@ -113,6 +113,63 @@ class ContractContract(models.Model):
         copy=False,
         track_visibility="onchange",
     )
+    modification_ids = fields.One2many(
+        comodel_name="contract.modification",
+        inverse_name="contract_id",
+        string="Modifications",
+    )
+
+    @api.model_create_multi
+    def create(self, vals_list):
+        records = super().create(vals_list)
+        records._set_start_contract_modification()
+        return records
+
+    def write(self, vals):
+        if "modification_ids" in vals:
+            res = super(
+                ContractContract, self.with_context(bypass_modification_send=True)
+            ).write(vals)
+            self._modification_mail_send()
+        else:
+            res = super(ContractContract, self).write(vals)
+        return res
+
+    @api.model
+    def _set_start_contract_modification(self):
+        for record in self:
+            if record.contract_line_ids:
+                date_start = min(record.contract_line_ids.mapped("date_start"))
+            else:
+                date_start = record.create_date
+            record.write(
+                {
+                    "modification_ids": [
+                        (0, 0, {"date": date_start, "description": _("Contract start")})
+                    ]
+                }
+            )
+
+    @api.model
+    def _modification_mail_send(self):
+        for record in self:
+            modification_ids_not_sent = record.modification_ids.filtered(
+                lambda x: not x.sent
+            )
+            if modification_ids_not_sent:
+                contract_modification_subtype = self.env.ref(
+                    "contract.mail_message_subtype_contract_modification"
+                )
+                notified_partners = record.message_follower_ids.filtered(
+                    lambda x: contract_modification_subtype in x.subtype_ids
+                ).mapped("partner_id")
+                if notified_partners:
+                    record.message_post_with_template(
+                        self.env.ref("contract.mail_template_contract_modification").id,
+                        partner_ids=[(4, x.id) for x in notified_partners],
+                        email_layout_xmlid="contract.template_contract_modification",
+                    )
+                modification_ids_not_sent.write({"sent": True})
 
     def _compute_access_url(self):
         for record in self: