Recently started using Django ORM.I want to execute this query 

```
 select student_id from students where student_id like "%97318%" order by CAST(student_id as UNSIGNED) desc;   

```

where student\_id is a CharField which I want as integer for querying.
I tried with 

```
  students.objects.filter(student_id__contains "97318").order('-student_id')

```

works fine. But don't know and couldn't find how to cast "student\_id" to int like the actual MySQL query mentioned above with "Django ORM". should I use raw query or is there a way out?
Let me know your suggestions.