fix: clear cache and prevent data access after DocType deletion (#34307)

* fix: clear cache and prevent data access after DocType deletion

* fix: Handle potential DB failures during migrate

---------

Co-authored-by: Ankush Menat <ankush@frappe.io>

frappe/cache_manager.py

@@ -147,17 +147,26 @@ def _clear_doctype_cache_from_redis(doctype: str | None = None):
 		clear_single(doctype)
 
 		# clear all parent doctypes
+		try:
 			for dt in frappe.get_all(
-			"DocField", "parent", dict(fieldtype=["in", frappe.model.table_fields], options=doctype)
+				"DocField",
+				"parent",
+				dict(fieldtype=["in", frappe.model.table_fields], options=doctype),
+				ignore_ddl=True,
 			):
 				clear_single(dt.parent)
 
 			# clear all parent doctypes
 			if not frappe.flags.in_install:
 				for dt in frappe.get_all(
-				"Custom Field", "dt", dict(fieldtype=["in", frappe.model.table_fields], options=doctype)
+					"Custom Field",
+					"dt",
+					dict(fieldtype=["in", frappe.model.table_fields], options=doctype),
+					ignore_ddl=True,
 				):
 					clear_single(dt.dt)
+		except frappe.DoesNotExistError:
+			pass  # core doctypes getting migrated.
 
 		# clear all notifications
 		delete_notification_count_for(doctype)

frappe/core/doctype/doctype/test_doctype.py

@@ -856,6 +856,16 @@ class TestDocType(IntegrationTestCase):
 		)
 		self.assertRaises(frappe.ValidationError, doctype.insert)
 
+	def test_delete_doc_clears_cache(self):
+		dt = new_doctype(
+			fields=[{"fieldname": "test_fdname", "fieldtype": "Data", "label": "Test Field"}],
+		).insert()
+		frappe.get_meta(dt.name)
+		frappe.delete_doc("DocType", dt.name, force=1, delete_permanently=False)
+		frappe.db.commit()
+		with self.assertRaises(frappe.DoesNotExistError):
+			frappe.get_meta(dt.name)
+
 
 def new_doctype(
 	name: str | None = None,

frappe/model/delete_doc.py

@@ -144,6 +144,8 @@ def delete_doc(
 					# in case a doctype doesnt have any controller code  nor any app and module
 					pass
 
+			frappe.clear_cache(doctype=name)
+
 		else:
 			# Lock the doc without waiting
 			try:

frappe/tests/test_fixture_import.py

@@ -32,6 +32,7 @@ class TestFixtureImport(IntegrationTestCase):
 		self.assertFalse(frappe.db.exists("DocType", "temp_doctype"))
 
 		self.create_new_doctype("temp_doctype")
+		frappe.db.commit()
 
 		dummy_name_list = ["jhon", "jane"]
 		path_to_exported_fixtures = self.insert_dummy_data_and_export("temp_doctype", dummy_name_list)
@@ -39,9 +40,6 @@ class TestFixtureImport(IntegrationTestCase):
 
 		import_doc(path_to_exported_fixtures)
 
-		delete_doc("DocType", "temp_doctype", delete_permanently=True)
-		os.remove(path_to_exported_fixtures)
-
 		self.assertEqual(frappe.db.count("temp_doctype"), len(dummy_name_list))
 
 		data = frappe.get_all("temp_doctype", "member_name")
@@ -53,6 +51,10 @@ class TestFixtureImport(IntegrationTestCase):
 
 		self.assertEqual(set(dummy_name_list), imported_data)
 
+		delete_doc("DocType", "temp_doctype", delete_permanently=True)
+		frappe.db.commit()
+		os.remove(path_to_exported_fixtures)
+
 	def test_singles_fixtures_import(self):
 		self.assertFalse(frappe.db.exists("DocType", "temp_singles"))