deal duplicate

src/main/java/com/zzsn/knowbase/service/impl/KnowledgeServiceImpl.java

@@ -440,8 +440,18 @@ class KnowledgeServiceImpl implements IKnowledgeService {
                     .content(one.get("content").toString())
                     .build());
         }
-        IPage<KnowledgeVO> pageData = new Page<>(pageNo, pageSize, knowledgeList.size());
-        pageData.setRecords(knowledgeList);
+        Map<String, List<KnowledgeVO>> map = knowledgeList.stream().collect(Collectors.groupingBy((KnowledgeVO::getId)));
+        Iterator<Map.Entry<String, List<KnowledgeVO>>> iterator = map.entrySet().iterator();
+        List<KnowledgeVO> knowledgeListGrouped = new ArrayList<>(map.size());
+        while (iterator.hasNext()){
+            Map.Entry<String, List<KnowledgeVO>> next = iterator.next();
+            List<KnowledgeVO> value = next.getValue();
+            KnowledgeVO knowledgeVO = value.get(0);
+            knowledgeVO.setContents(value.stream().map(item->item.getContents().get(0)).collect(Collectors.toList()));
+            knowledgeListGrouped.add(knowledgeVO);
+        }
+        IPage<KnowledgeVO> pageData = new Page<>(pageNo, pageSize, knowledgeListGrouped.size());
+        pageData.setRecords(knowledgeListGrouped);
 
         return pageData;
     }