Add support for disassembly production

Closes #14091

modules/production/CHANGELOG

@@ -1,3 +1,4 @@
+* Add support for disassembly production
 
 Version 7.6.0 - 2025-04-28
 --------------------------

modules/production/bom.py

@@ -22,6 +22,8 @@ class BOM(DeactivableMixin, ModelSQL, ModelView):
     code_readonly = fields.Function(
         fields.Boolean("Code Readonly"), 'get_code_readonly')
     inputs = fields.One2Many('production.bom.input', 'bom', "Input Materials")
+    input_products = fields.Many2Many(
+        'production.bom.input', 'bom', 'product', "Input Products")
     outputs = fields.One2Many(
         'production.bom.output', 'bom', "Output Materials")
     output_products = fields.Many2Many('production.bom.output',
@@ -71,18 +73,18 @@ class BOM(DeactivableMixin, ModelSQL, ModelView):
             ('code', operator, code_value, *extra),
             ]
 
-    def compute_factor(self, product, quantity, unit):
-        '''
-        Compute factor for an output product
-        '''
-        Uom = Pool().get('product.uom')
-        output_quantity = 0
-        for output in self.outputs:
-            if output.product == product:
-                output_quantity += Uom.compute_qty(
-                    output.unit, output.quantity, unit, round=False)
-        if output_quantity:
-            return quantity / output_quantity
+    def compute_factor(self, product, quantity, unit, type='outputs'):
+        "Compute factor for a product from the type"
+        pool = Pool()
+        Uom = pool.get('product.uom')
+        assert type in {'inputs', 'outputs'}, f"Invalid {type}"
+        total = 0
+        for line in getattr(self, type):
+            if line.product == product:
+                total += Uom.compute_qty(
+                    line.unit, line.quantity, unit, round=False)
+        if total:
+            return quantity / total
         else:
             return 0
 
@@ -108,6 +110,7 @@ class BOM(DeactivableMixin, ModelSQL, ModelView):
         else:
             default = default.copy()
         default.setdefault('code', None)
+        default.setdefault('input_products', None)
         default.setdefault('output_products', None)
         return super().copy(records, default=default)
 

modules/production/production.py

@@ -70,9 +70,18 @@ class Production(ShipmentAssignMixin, Workflow, ModelSQL, ModelView):
             'readonly': (~Eval('state').in_(['request', 'draft'])
                 | Eval('inputs', [-1]) | Eval('outputs', [-1])),
             })
+    type = fields.Selection([
+            ('assembly', "Assembly"),
+            ('disassembly', "Disassembly"),
+            ], "Type", required=True,
+        states={
+            'readonly': ~Eval('state').in_(['request', 'draft']),
+            })
     product = fields.Many2One('product.product', 'Product',
         domain=[
-            ('producible', '=', True),
+            If(Eval('type') == 'assembly',
+                ('producible', '=', True),
+                ()),
             ],
         states={
             'readonly': ~Eval('state').in_(['request', 'draft']),
@@ -83,7 +92,10 @@ class Production(ShipmentAssignMixin, Workflow, ModelSQL, ModelView):
         depends={'company'})
     bom = fields.Many2One('production.bom', 'BOM',
         domain=[
-            ('output_products', '=', Eval('product', 0)),
+            If(Eval('type') == 'disassembly',
+                ('input_products', '=', Eval('product', -1)),
+                ('output_products', '=', Eval('product', -1)),
+                ),
             ],
         states={
             'readonly': (~Eval('state').in_(['request', 'draft'])
@@ -305,6 +317,10 @@ class Production(ShipmentAssignMixin, Workflow, ModelSQL, ModelView):
             warehouse = Location(warehouse_id)
             return warehouse.production_location.id
 
+    @classmethod
+    def default_type(cls):
+        return 'assembly'
+
     @staticmethod
     def default_company():
         return Transaction().context.get('company')
@@ -312,7 +328,7 @@ class Production(ShipmentAssignMixin, Workflow, ModelSQL, ModelView):
     @fields.depends('product', 'bom')
     def compute_lead_time(self, pattern=None):
         pattern = pattern.copy() if pattern is not None else {}
-        if self.product:
+        if self.product and self.product.producible:
             pattern.setdefault('bom', self.bom.id if self.bom else None)
             for line in self.product.production_lead_times:
                 if line.match(pattern):
@@ -384,14 +400,15 @@ class Production(ShipmentAssignMixin, Workflow, ModelSQL, ModelView):
         return move
 
     @fields.depends(
-        'bom', 'product', 'unit', 'quantity', 'inputs', 'outputs',
+        'type', 'bom', 'product', 'unit', 'quantity', 'inputs', 'outputs',
         methods=['_move'])
     def explode_bom(self):
         if not (self.bom and self.product and self.unit):
             return
 
         factor = self.bom.compute_factor(
-            self.product, self.quantity or 0, self.unit)
+            self.product, self.quantity or 0, self.unit,
+            type='inputs' if self.type == 'disassembly' else 'outputs')
         inputs = []
         for input_ in self.bom.inputs:
             quantity = input_.compute_quantity(factor)

modules/production/tests/test_module.py

@@ -20,7 +20,7 @@ class ProductionTestCase(CompanyTestMixin, ModuleTestCase):
         LeadTime = pool.get('production.lead_time')
 
         date = datetime.date(2016, 11, 26)
-        product = Product()
+        product = Product(producible=True)
         product.production_lead_times = []
         production = Production()
         production.planned_date = date

modules/production/view/production_form.xml

@@ -22,6 +22,10 @@ this repository contains the full copyright notices and license terms. -->
     <label name="warehouse"/>
     <field name="warehouse"/>
 
+    <label name="type"/>
+    <field name="type"/>
+    <newline/>
+
     <label name="product"/>
     <field name="product"/>
     <label name="bom"/>

modules/production/view/production_list.xml

@@ -5,6 +5,7 @@ this repository contains the full copyright notices and license terms. -->
     <field name="company" expand="1" optional="1"/>
     <field name="number" expand="1"/>
     <field name="reference" expand="1" optional="1"/>
+    <field name="type" optional="1"/>
     <field name="product" expand="2"/>
     <field name="quantity" symbol="unit"/>
     <field name="planned_start_date" optional="0"/>