[FIX] mrp: start date

The start date of a manufacturing order is never set. One consequence is
that the Gantt view, which relies on this field, is never populated.

opw-693743

addons/mrp/models/mrp_workorder.py

@@ -356,7 +356,10 @@ class MrpWorkorder(models.Model):
                 raise UserError(_("You need to define at least one productivity loss in the category 'Performance'. Create one from the Manufacturing app, menu: Configuration / Productivity Losses."))
         for workorder in self:
             if workorder.production_id.state != 'progress':
-                workorder.production_id.state = 'progress'
+                workorder.production_id.write({
+                    'state': 'progress',
+                    'date_start': datetime.now(),
+                })
             timeline.create({
                 'workorder_id': workorder.id,
                 'workcenter_id': workorder.workcenter_id.id,
@@ -449,4 +452,4 @@ class MrpWorkorder(models.Model):
         self.ensure_one()
         action = self.env.ref('stock.action_stock_scrap').read()[0]
         action['domain'] = [('workorder_id', '=', self.id)]
-        return action
+        return action

addons/mrp/wizard/mrp_product_produce.py

@@ -1,6 +1,8 @@
 # -*- coding: utf-8 -*-
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
+from datetime import datetime
+
 from odoo import api, fields, models, _
 from odoo.addons import decimal_precision as dp
 from odoo.exceptions import UserError
@@ -87,7 +89,10 @@ class MrpProductProduce(models.TransientModel):
                 move.quantity_done_store += quantity * move.unit_factor
         self.check_finished_move_lots()
         if self.production_id.state == 'confirmed':
-            self.production_id.state = 'progress'
+            self.production_id.write({
+                'state': 'progress',
+                'date_start': datetime.now(),
+            })
         return {'type': 'ir.actions.act_window_close'}
 
     @api.multi