+
+======== update django database to reflect changes in existing models with migration system (e.g., south) =========
+
+As south is already installed , you just have to do:
+
+$./manage.py migrate
+
+if it fails:
+
+1. go to myslice directory
+2. do sqlite3 myslice.sqlite3 [if sqlite3: command not found, do $apt-get install sqlite3]
+3. check the list of tables with sqlite> .tables
+4. if you find those tables that was mentioned in the failure message while running $./manage.py migrate
+ do sqlite> DROP TABLE mentioned_table
+ [mentioned_table = the tables that was explicity mentioned in the failure message of $./manage.py migrate]
+5. sqlite> .quit
+6. $./manage.py migrate
+
+
+
+