From d28390d79249c2080443f45fb04c12e6f7f5465e Mon Sep 17 00:00:00 2001
From: kolaente <k@knt.li>
Date: Mon, 19 Jul 2021 23:40:18 +0200
Subject: [PATCH] Fix task relations not getting properly cleaned up when
 deleting them

---
 pkg/models/task_relation.go | 21 +++++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/pkg/models/task_relation.go b/pkg/models/task_relation.go
index 272972a6b3..4be80a4cae 100644
--- a/pkg/models/task_relation.go
+++ b/pkg/models/task_relation.go
@@ -19,6 +19,7 @@ package models
 import (
 	"time"
 
+	"xorm.io/builder"
 	"xorm.io/xorm"
 
 	"code.vikunja.io/api/pkg/user"
@@ -208,9 +209,23 @@ func (rel *TaskRelation) Create(s *xorm.Session, a web.Auth) error {
 // @Failure 500 {object} models.Message "Internal error"
 // @Router /tasks/{taskID}/relations/{relationKind}/{otherTaskId} [delete]
 func (rel *TaskRelation) Delete(s *xorm.Session, a web.Auth) error {
+
+	cond := builder.Or(
+		builder.And(
+			builder.Eq{"task_id": rel.TaskID},
+			builder.Eq{"other_task_id": rel.OtherTaskID},
+			builder.Eq{"relation_kind": rel.RelationKind},
+		),
+		builder.And(
+			builder.Eq{"task_id": rel.OtherTaskID},
+			builder.Eq{"other_task_id": rel.TaskID},
+			builder.Eq{"relation_kind": rel.RelationKind},
+		),
+	)
+
 	// Check if the relation exists
 	exists, err := s.
-		Where("task_id = ? AND other_task_id = ? AND relation_kind = ?", rel.TaskID, rel.OtherTaskID, rel.RelationKind).
+		Where(cond).
 		Exist(&TaskRelation{})
 	if err != nil {
 		return err
@@ -223,6 +238,8 @@ func (rel *TaskRelation) Delete(s *xorm.Session, a web.Auth) error {
 		}
 	}
 
-	_, err = s.Delete(rel)
+	_, err = s.
+		Where(cond).
+		Delete(&TaskRelation{})
 	return err
 }