[18.0][FIX] mrp_bom_attribute_match: Error when use Compute Price from BOM on Product use Attribute Match on BOM Lines

[Vang-NguyenPhu]

Odoo's "Compute Price from BOM" button on the product template expects a concrete product variant (product.product) on the BOM line to retrieve the Unit of Measure (uom_id).

When BOM Attribute Match is used, a user selects a product template (product.template) instead of a specific variant. This leads to an error because the BOM line's product_id field is not populated, causing the system to fail when trying to compute the price.

Reproduce:
1/ Create a BOM Attribute Match for Test 1

2/ Go to Product Variant of Test 1 -> Click on Compute Price from BOM

Full error message:
Traceback (most recent call last):
File "/opt/odoo/odoo/models.py", line 6268, in ensure_one
_id, = self._ids
ValueError: not enough values to unpack (expected 1, got 0)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/opt/odoo/odoo/http.py", line 2144, in _transactioning
return service_model.retrying(func, env=self.env)
File "/opt/odoo/odoo/service/model.py", line 156, in retrying
result = func()
File "/opt/odoo/odoo/http.py", line 2111, in _serve_ir_http
response = self.dispatcher.dispatch(rule.endpoint, args)
File "/opt/odoo/odoo/http.py", line 2359, in dispatch
result = self.request.registry['ir.http']._dispatch(endpoint)
File "/opt/odoo/odoo/addons/base/models/ir_http.py", line 333, in _dispatch
result = endpoint(**request.params)
File "/opt/odoo/odoo/http.py", line 754, in route_wrapper
result = endpoint(self, *args, **params_ok)
File "/opt/odoo/addons/web/controllers/dataset.py", line 42, in call_button
action = call_kw(request.env[model], method, args, kwargs)
File "/opt/odoo/odoo/api.py", line 535, in call_kw
result = getattr(recs, name)(*args, **kwargs)
File "/opt/odoo/addons/mrp_account/models/product.py", line 37, in button_bom_cost
self._set_price_from_bom()
File "/opt/odoo/addons/mrp_account/models/product.py", line 48, in _set_price_from_bom
self.standard_price = self._compute_bom_price(bom, boms_to_recompute=boms_to_recompute)
File "/opt/odoo/addons/mrp_subcontracting_account/models/product_product.py", line 12, in _compute_bom_price
price = super()._compute_bom_price(bom, boms_to_recompute, byproduct_bom)
File "/opt/odoo/addons/mrp_account/models/product.py", line 105, in _compute_bom_price
total += line.product_id.uom_id._compute_price(line.product_id.standard_price, line.product_uom_id) * line.product_qty
File "/opt/odoo/addons/uom/models/uom_uom.py", line 244, in _compute_price
self.ensure_one()
File "/opt/odoo/odoo/models.py", line 6271, in ensure_one
raise ValueError("Expected singleton: %s" % self)
ValueError: Expected singleton: uom.uom()

[hieulucky111]

Code Review. LGTM

[DucTruongKomit]

Review code LGTM

[huynh-ch]

LGTM 👍

[OCA-git-bot]

This PR has the approved label and has been created more than 5 days ago. It should therefore be ready to merge by a maintainer (or a PSC member if the concerned addon has no declared maintainer). 🤖