修复上一次的排名及热度计算错误问题

src/main/java/com/zhiwei/searchhotcrawler/dao/HotSearchCacheDAO.java

@@ -94,8 +94,8 @@ public class HotSearchCacheDAO  {
                nowDoc.put("lastCount", lastCount);
                nowDoc.put("highestRank", highestRank);
                nowDoc.put("highestCount", highestCount);
-               nowDoc.put("preRank", null);
-               nowDoc.put("preCount", null);
+               nowDoc.put("preRank", nowDoc.getInteger("lastRank"));
+               nowDoc.put("preCount", nowDoc.getInteger("lastCount"));
                nowDoc.put("duration", durationNow);
                collection.replaceOne(query, nowDoc);
            } else {
@@ -114,8 +114,8 @@ public class HotSearchCacheDAO  {
                nowDoc.put("startTime", startTime);
                nowDoc.put("endTime", endTime);
                nowDoc.put("duration", durationNow);
-               nowDoc.put("preRank", nowDoc.getInteger("lastRank"));
-               nowDoc.put("preCount", nowDoc.getInteger("lastCount"));
+               nowDoc.put("preRank", null);
+               nowDoc.put("preCount", null);
 
                collection.insertOne(nowDoc);
            }