[UPD]: mrp: pregen and autoassign serials

addons/mrp/__manifest__.py

@@ -24,6 +24,7 @@
         'wizard/mrp_consumption_warning_views.xml',
         'wizard/mrp_batch_produce.xml',
         'wizard/mrp_production_split.xml',
+        'wizard/mrp_generate_serials_views.xml',
         'views/mrp_views_menus.xml',
         'views/stock_move_views.xml',
         'views/mrp_workorder_views.xml',

addons/mrp/models/mrp_production.py

@@ -272,6 +272,20 @@ def _get_default_is_locked(self):
         string='Date Category', store=False,
         search='_search_date_category', readonly=True
     )
+    lot_ids = fields.Many2many(
+        'stock.lot',
+        'mrp_production_lot_rel',
+        'production_id',
+        'lot_id',
+        string='Pre-generated Serials',
+        copy=False,
+        help="Serial/Lot numbers pre-generated for this MO. Used to prefill the Batch Produce wizard.",
+    )
+
+    lot_serial_count = fields.Integer(
+        string="Generated Serials",
+        compute="_compute_lot_serial_count",
+    )
 
     _sql_constraints = [
         ('name_uniq', 'unique(name, company_id)', 'Reference must be unique per Company!'),
@@ -339,6 +353,11 @@ def _compute_locations(self):
                 fallback_loc = self.env['stock.warehouse'].search([('company_id', '=', company_id)], limit=1).lot_stock_id
             production.location_src_id = production.picking_type_id.default_location_src_id.id or fallback_loc.id
             production.location_dest_id = production.picking_type_id.default_location_dest_id.id or fallback_loc.id
+
+    @api.depends("lot_ids")
+    def _compute_lot_serial_count(self):
+        for mo in self:
+            mo.lot_serial_count = len(mo.lot_ids)
 
     @api.model
     def _search_components_availability_state(self, operator, value):
@@ -1142,6 +1161,24 @@ def action_update_bom(self):
             if production.bom_id:
                 production._link_bom(production.bom_id)
         self.is_outdated_bom = False
+
+    def action_view_pregenerated_serials(self):
+        self.ensure_one()
+        action = self.env["ir.actions.actions"]._for_xml_id("stock.action_production_lot_form")
+        action["domain"] = [("id", "in", self.lot_ids.ids)]
+        action["context"] = {}
+        return action
+
+    def action_open_generate_serials_wizard(self):
+        self.ensure_one()
+        return {
+            "type": "ir.actions.act_window",
+            "name": _("Generate Serials"),
+            "res_model": "mrp.generate.serials",
+            "view_mode": "form",
+            "target": "new",
+            "context": {"active_id": self.id},
+        }
 
     def _get_bom_values(self, ratio=1):
         """ Returns the BoM lines, by-products and operations values needed to

addons/mrp/security/ir.model.access.csv

@@ -63,3 +63,4 @@ access_mrp_workcenter_capacity_manager,mrp.workcenter.capacity.manager,model_mrp
 access_mrp_workcenter_capacity_group_user,mrp.workcenter.capacity,model_mrp_workcenter_capacity,mrp.group_mrp_user,1,0,0,0
 access_mrp_batch_produce,access.mrp_batch_produce,model_mrp_batch_produce,mrp.group_mrp_user,1,1,1,0
 access_stock_move_mrp_user,stock.move mrp_user,stock.model_stock_move,mrp.group_mrp_user,1,1,1,1
+access_mrp_generate_serials,access.mrp.generate.serials,model_mrp_generate_serials,mrp.group_mrp_user,1,1,1,0

addons/mrp/views/mrp_production_views.xml

@@ -218,11 +218,31 @@
                     <field name="is_planned" invisible="1"/>
                     <field name="show_allocation" invisible="1"/>
                     <field name="workorder_ids" invisible="1"/>
+                    <field name="lot_serial_count" invisible="1"/>
                     <div class="oe_button_box" name="button_box">
                         <button name="action_view_reception_report" string="Allocation" type="object"
                             class="oe_stat_button" icon="fa-list"
                             invisible="not show_allocation"
                             groups="mrp.group_mrp_reception_report"/>
+                        <button class="oe_stat_button"
+                            name="action_open_generate_serials_wizard"
+                            type="object"
+                            icon="fa-hashtag"
+                            invisible="product_tracking != 'serial' or not product_qty or state in ('done','cancel')">
+                            <div class="o_field_widget o_stat_info">
+                                <span class="o_stat_text">Generate Serials</span>
+                            </div>
+                        </button>
+                        <button class="oe_stat_button"
+                            name="action_view_pregenerated_serials"
+                            type="object"
+                            icon="fa-barcode"
+                            invisible="lot_serial_count == 0">
+                            <div class="o_field_widget o_stat_info">
+                                <span class="o_stat_value"><field name="lot_serial_count"/></span>
+                                <span class="o_stat_text">Serials</span>
+                            </div>
+                        </button>
                         <button class="oe_stat_button" name="action_view_mrp_production_childs" type="object" icon="fa-wrench" invisible="mrp_production_child_count == 0">
                             <div class="o_field_widget o_stat_info">
                                 <span class="o_stat_value"><field name="mrp_production_child_count"/></span>

addons/mrp/wizard/__init__.py

@@ -9,3 +9,4 @@
 from . import mrp_batch_produce
 from . import mrp_production_split
 from . import stock_label_type
+from . import mrp_generate_serials

addons/mrp/wizard/mrp_batch_produce.py

@@ -14,6 +14,36 @@ class MrpBatchProduct(models.TransientModel):
     _name = 'mrp.batch.produce'
     _description = 'Produce a batch of production order'
 
+    @api.model
+    def default_get(self, fields_list):
+        # fill pre-generated serials
+        vals = super().default_get(fields_list)
+        active_id = self.env.context.get("active_id")
+        if not active_id:
+            active_ids = self.env.context.get("active_ids") or []
+            active_id = active_ids[0] if active_ids else False
+        if not active_id:
+            return vals
+        mo = self.env["mrp.production"].browse(active_id)
+        if not mo.exists():
+            return vals
+        if mo.product_id.tracking != "serial":
+            return vals
+        if mo.lot_ids:
+            lots = mo.lot_ids.sorted(key=lambda l: l.name)
+            lot_names = lots.mapped("name")
+        # only full order
+        if len(lot_names) != int(mo.product_qty):
+            raise UserError(
+                _("This MO has %(n)s pre-generated serials but quantity is %(q)s. "
+                  "Generate exactly one serial per unit (or adjust the MO quantity).")
+                % {"n": len(lot_names), "q": mo.product_qty}
+            )
+        vals["production_text"] = "\n".join(lot_names)
+        vals["lot_qty"] = len(lot_names)
+        vals["lot_name"] = lot_names[0]
+        return vals
+
     production_id = fields.Many2one('mrp.production', 'Production')
 
     production_text_help = fields.Text('Explanation for batch production', compute='_compute_production_text_help')

addons/mrp/wizard/mrp_generate_serials.py

@@ -0,0 +1,49 @@
+from odoo import _, api, fields, models
+from odoo.exceptions import UserError
+
+
+class MrpGenerateSerials(models.TransientModel):
+    _name = "mrp.generate.serials"
+    _description = "Pregenerate serial numbers for a Mass MO"
+
+    production_id = fields.Many2one("mrp.production", required=True, readonly=True)
+    first_lot_sn = fields.Char(string="First Serial")
+    qty = fields.Integer(string="Number of Serials", required=True, default=1)
+
+    @api.model
+    def default_get(self, fields_list):
+        vals = super().default_get(fields_list)
+        active_id = self.env.context.get("active_id")
+        if not active_id:
+            raise UserError(_("Open this wizard from a Manufacturing Order."))
+        mo = self.env["mrp.production"].browse(active_id)
+        vals["production_id"] = mo.id
+      	# guess this if possible
+        vals["first_lot_sn"] = self.env["stock.lot"]._get_next_serial(mo.company_id, mo.product_id)
+        vals["qty"] = max(int(mo.product_qty) - len(mo.lot_ids), 1)
+        return vals
+
+    def action_generate(self):
+        self.ensure_one()
+        mo = self.production_id
+        if mo.product_tracking != "serial":
+            raise UserError(_("The product is not tracked by unique serial number."))
+        if self.qty <= 0:
+            raise UserError(_("Please enter a number of serials to generate."))
+        if not self.first_lot_sn:
+            raise UserError(_("Please specify the first serial number."))
+        lots_name = self.env["stock.lot"].generate_lot_names(self.first_lot_sn, self.qty)
+        names = [x["lot_name"] for x in lots_name]
+        existing = self.env["stock.lot"].search([
+            ("company_id", "in", [mo.company_id.id, False]),
+            ("product_id", "=", mo.product_id.id),
+            ("name", "in", names),
+        ])
+        existing_names = set(existing.mapped("name"))
+        to_create = [{"name": n, "product_id": mo.product_id.id} for n in names if n not in existing_names]
+        created = self.env["stock.lot"].create(to_create) if to_create else self.env["stock.lot"]
+        lots = existing | created
+        lots_by_name = {l.name: l.id for l in lots}
+        ordered_ids = [lots_by_name[n] for n in names if n in lots_by_name]
+        mo.lot_ids = [(6, 0, ordered_ids)]
+        return {"type": "ir.actions.act_window_close"}

addons/mrp/wizard/mrp_generate_serials_views.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<odoo>
+    <record id="view_mrp_generate_serials_form" model="ir.ui.view">
+        <field name="name">mrp.generate.serials.form</field>
+        <field name="model">mrp.generate.serials</field>
+        <field name="arch" type="xml">
+            <form string="Generate Serials">
+                <group>
+                    <field name="production_id" invisible="1"/>
+                    <field name="first_lot_sn"/>
+                    <field name="qty"/>
+                </group>
+                <footer>
+                    <button name="action_generate" type="object" string="Generate" class="btn-primary"/>
+                    <button string="Cancel" special="cancel" class="btn-secondary"/>
+                </footer>
+            </form>
+        </field>
+    </record>
+</odoo>