Create unique index for the table like

CHANGELOG.md

@@ -8,6 +8,7 @@ HumHub Changelog
 - Fix #6919: Fix saving of user profile country field value and enable a searching by country title
 - Fix #6919: Migration to revert user profile country names to Iso 3166 codes
 - Fix #6966: Make "Invite new people" always possible for Admins
+- Fix #6969: Create unique index for the table `like`
 
 1.15.4 (March 20, 2024)
 -----------------------

protected/humhub/modules/like/migrations/m240425_144905_unique_index.php

@@ -0,0 +1,45 @@
+<?php
+
+use humhub\components\Migration;
+use humhub\modules\like\models\Like;
+
+
+/**
+ * Class m240425_144905_unique_index
+ */
+class m240425_144905_unique_index extends Migration
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function safeUp()
+    {
+        $likes = Like::find()
+            ->groupBy(['object_model', 'object_id', 'created_by'])
+            ->having('COUNT(*) > 1');
+
+        foreach ($likes->each() as $like) {
+            /* @var Like $like */
+            Like::deleteAll(['AND',
+                ['object_model' => $like->object_model],
+                ['object_id' => $like->object_id],
+                ['created_by' => $like->created_by],
+                ['!=', 'id', $like->id],
+            ]);
+
+            $like->flushCache();
+        }
+
+        $this->safeCreateIndex('unique-object-user', 'like', ['object_model', 'object_id', 'created_by'], true);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function safeDown()
+    {
+        echo "m240425_144905_unique_index cannot be reverted.\n";
+
+        return false;
+    }
+}

protected/humhub/modules/like/models/Like.php

@@ -96,7 +96,7 @@ function() use ($objectModel, $objectId) {
      */
     public function afterSave($insert, $changedAttributes)
     {
-        Yii::$app->cache->delete('likes_' . $this->object_model . "_" . $this->object_id);
+        $this->flushCache();
 
         if ($insert) {
             \humhub\modules\like\activities\Liked::instance()->about($this)->save();
@@ -119,8 +119,13 @@ public function afterSave($insert, $changedAttributes)
      */
     public function beforeDelete()
     {
-        Yii::$app->cache->delete('likes_' . $this->object_model . "_" . $this->object_id);
+        $this->flushCache();
         return parent::beforeDelete();
     }
 
+    public function flushCache()
+    {
+        Yii::$app->cache->delete('likes_' . $this->object_model . '_' . $this->object_id);
+    }
+
 }