snapshot of https://github.com/makeplane/plane.git @ d868349a55de79979eb8b98701bf1702c67ad634 (2026-09-15)

apps/api/plane/utils/issue_relation_mapper.py

@@ -0,0 +1,32 @@
+# Copyright (c) 2023-present Plane Software, Inc. and contributors
+# SPDX-License-Identifier: AGPL-3.0-only
+# See the LICENSE file for details.
+
+def get_inverse_relation(relation_type):
+    relation_mapping = {
+        "start_after": "start_before",
+        "finish_after": "finish_before",
+        "blocked_by": "blocking",
+        "blocking": "blocked_by",
+        "start_before": "start_after",
+        "finish_before": "finish_after",
+        "implemented_by": "implements",
+        "implements": "implemented_by",
+    }
+    return relation_mapping.get(relation_type, relation_type)
+
+
+def get_actual_relation(relation_type):
+    # This function is used to get the actual relation type which is stored in database
+    actual_relation = {
+        "start_after": "start_before",
+        "finish_after": "finish_before",
+        "blocking": "blocked_by",
+        "blocked_by": "blocked_by",
+        "start_before": "start_before",
+        "finish_before": "finish_before",
+        "implemented_by": "implemented_by",
+        "implements": "implemented_by",
+    }
+
+    return actual_relation.get(relation_type, relation_type)