refactor(stock): convert Job Card reference update to qb

Replace the raw f-string UPDATE (name + production_item match) that links a
Quality Inspection back to its Job Card with frappe.qb.update. Same result on
MariaDB; valid under Postgres.

Tests: the Job Card reference update and its production_item scoping.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

erpnext/stock/doctype/quality_inspection/quality_inspection.py

@@ -215,14 +215,13 @@ class QualityInspection(Document):
 
 		if self.reference_type == "Job Card":
 			if self.reference_name:
-				frappe.db.sql(
-					f"""
-					UPDATE `tab{self.reference_type}`
-					SET quality_inspection = %s, modified = %s
-					WHERE name = %s and production_item = %s
-				""",
-					(quality_inspection, self.modified, self.reference_name, self.item_code),
-				)
+				ref = frappe.qb.DocType(self.reference_type)
+				(
+					frappe.qb.update(ref)
+					.set(ref.quality_inspection, quality_inspection)
+					.set(ref.modified, self.modified)
+					.where((ref.name == self.reference_name) & (ref.production_item == self.item_code))
+				).run()
 
 		else:
 			doctype = self.reference_type + " Item"

erpnext/stock/doctype/quality_inspection/test_quality_inspection.py

@@ -279,6 +279,65 @@ class TestQualityInspection(ERPNextTestSuite):
 
 		se.delete()
 
+	def test_qi_updates_job_card_reference(self):
+		"""Submitting a QI with reference_type 'Job Card' writes its name onto the
+		Job Card's quality_inspection field (the Job Card branch of
+		QualityInspection.update_qc_reference)."""
+		create_item("_Test Item")
+
+		# Job Card whose production_item matches the QI item_code -> must be updated.
+		matching_jc = make_minimal_job_card(production_item="_Test Item")
+		# Job Card with a different production_item -> the production_item filter must
+		# keep it untouched.
+		other_item = create_item("_Test Item for QC " + frappe.utils.random_string(6)).name
+		non_matching_jc = make_minimal_job_card(production_item=other_item)
+
+		qa = create_quality_inspection(
+			item_code="_Test Item",
+			reference_type="Job Card",
+			reference_name=matching_jc,
+		)
+
+		# The converted UPDATE wrote the QI name onto the matching Job Card.
+		self.assertEqual(
+			frappe.db.get_value("Job Card", matching_jc, "quality_inspection"),
+			qa.name,
+		)
+		# The production_item filter excluded the Job Card with a different item.
+		self.assertFalse(frappe.db.get_value("Job Card", non_matching_jc, "quality_inspection"))
+
+	def test_qi_job_card_reference_respects_production_item(self):
+		"""A QI referencing a Job Card by name but whose item_code does not match the
+		Job Card's production_item must NOT update that Job Card."""
+		create_item("_Test Item")
+		mismatch_item = create_item("_Test Item Mismatch QC " + frappe.utils.random_string(6)).name
+
+		# Job Card produces a different item than the QI's item_code.
+		jc = make_minimal_job_card(production_item=mismatch_item)
+
+		create_quality_inspection(
+			item_code="_Test Item",
+			reference_type="Job Card",
+			reference_name=jc,
+		)
+
+		# name matches but production_item != item_code, so the row is left untouched.
+		self.assertFalse(frappe.db.get_value("Job Card", jc, "quality_inspection"))
+
+
+def make_minimal_job_card(production_item):
+	"""db_insert a minimal submitted Job Card row carrying only the columns the
+	converted UPDATE reads (name, production_item, quality_inspection, modified)."""
+	jc = frappe.new_doc("Job Card")
+	jc.name = "_T-Job Card-" + frappe.utils.random_string(10)
+	jc.flags.name_set = True
+	jc.production_item = production_item
+	jc.company = "_Test Company"
+	jc.for_quantity = 1
+	jc.docstatus = 1
+	jc.db_insert()
+	return jc.name
+
 
 def create_quality_inspection(**args):
 	args = frappe._dict(args)