How to distinguish field that requires null=True when blank=True is set in Django models?

Question

Some model fields such as DateTimeField require null=True option when blank=True option is set.

I'd like to know which fields require that (maybe dependent on backend DBMS), and there is any way to do this automatically.

Answer 1

This post should help to understand the difference on blank and null in Django

Answer 2

null=True is used to tell that in DB value can be NULL blank=True is only for django , so django doesn't raise error if field is blank e.g. in admin interface so blank=True has nothing to do with DB NULL requirement will vary from DB to DB, and it is upto you to decide if you want some column NULL or not