changed the flush method to check for capped collections and only remove all docs if the collection is not capped

Author: Mark Unsworth

django_mongodb_engine/base.py

@@ -64,7 +64,13 @@ def sql_flush(self, style, tables, sequence_list, allow_cascade=False):
             if table.startswith('system.'):
                 # Do not try to drop system collections.
                 continue
-            self.connection.database[table].remove()
+
+            collection = self.connection.database[table]
+            options = collection.options()
+
+            if not options.get('capped', False):
+                collection.remove({})
+
         return []
 
     def validate_autopk_value(self, value):