[MIG] contract_invoice_start_end_dates to v12

contract_invoice_start_end_dates/models/contract_line.py

@@ -0,0 +1,20 @@
+# Copyright 2019-2020 Akretion France (http://www.akretion.com/)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from odoo import models
+
+
+class ContractLine(models.Model):
+    _inherit = 'contract.line'
+
+    def _prepare_invoice_line(self, invoice_id=False, invoice_values=False):
+        vals = super(ContractLine, self)._prepare_invoice_line(
+            invoice_id=invoice_id, invoice_values=invoice_values)
+        if self.product_id.must_have_dates:
+            dates = self._get_period_to_invoice(
+                self.last_date_invoiced, self.recurring_next_date)
+            vals.update({
+                'start_date': dates[0],
+                'end_date': dates[1],
+            })
+        return vals