From 1b7239c2bd907f706e8b91b1fefa100eff1c3c0d Mon Sep 17 00:00:00 2001
From: TIm Cremer <tim.cremer@tum.de>
Date: Tue, 19 Nov 2024 13:52:49 +0100
Subject: [PATCH] Remove duplicates from the search result

---
 .../communication/repository/CustomPostRepositoryImpl.java  | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/main/java/de/tum/cit/aet/artemis/communication/repository/CustomPostRepositoryImpl.java b/src/main/java/de/tum/cit/aet/artemis/communication/repository/CustomPostRepositoryImpl.java
index cfdd5f71443e..aae587022c93 100644
--- a/src/main/java/de/tum/cit/aet/artemis/communication/repository/CustomPostRepositoryImpl.java
+++ b/src/main/java/de/tum/cit/aet/artemis/communication/repository/CustomPostRepositoryImpl.java
@@ -1,6 +1,8 @@
 package de.tum.cit.aet.artemis.communication.repository;
 
+import java.util.ArrayList;
 import java.util.Collections;
+import java.util.LinkedHashSet;
 import java.util.List;
 
 import jakarta.persistence.EntityManager;
@@ -50,6 +52,8 @@ public Page<Long> findPostIdsWithSpecification(Specification<Post> specification
         query.setMaxResults(pageable.getPageSize());
 
         List<Long> postIds = query.getResultList();
+        // removes all duplicates from the answer posts
+        List<Long> uniquePostIds = new ArrayList<>(new LinkedHashSet<>(postIds));
 
         // Count query
         CriteriaQuery<Long> countQuery = builder.createQuery(Long.class);
@@ -66,6 +70,6 @@ public Page<Long> findPostIdsWithSpecification(Specification<Post> specification
         Long countResult = entityManager.createQuery(countQuery).getSingleResult();
         long count = countResult != null ? countResult : 0L;
 
-        return new PageImpl<>(postIds, pageable, count);
+        return new PageImpl<>(uniquePostIds, pageable, count);
     }
 }