Version 1 hotfix #7 for merge

app.py

@@ -187,7 +187,7 @@ def merge_forecast_data(historical, test, future):
     test.rename(columns={test.columns[0]: "Predicted Sales"}, inplace=True)
     future = future.to_frame()
     future.rename(columns={future.columns[0]: "Future Forecasted Sales"}, inplace=True)
-    merged_dataframe = pd.merge_ordered(historical, pd.merge_ordered(test, future, left_by='Date', right_by='Date'), left_by='Date', right_by='Date')
+    merged_dataframe = pd.merge_ordered(historical, pd.merge_ordered(test, future, on='Date'), on='Date')
 
     return merged_dataframe