null=True is the opposite of what you are asking for anyway. You can use null=False, and the column will be created with the database's version of:
NOT NULL Which is the postgres spelling. This will prevent the database from allowing a database NULL from being stored there. But it will NOT prevent storing an empty string. Assuming that your database supports it, you could write a "trigger" or "constraint" that checks for non blank and fails the transaction otherwise. But, in so far as I know, Django provides no help in creating this constraint. Bill On Wed, Sep 26, 2012 at 4:47 PM, Jonas Geiregat <jo...@geiregat.org> wrote: > Hello, > > While setting up a new model I'm trying to have a strong data model. > > One of the requirements is that a certain field cannot be null. > > lastname = models.CharField( > blank=False, > default=None, > ..) > > I'm accomplishing this by the above code. This ensure that even on a database > level lastname will not be NULL, by setting default to None. > > I'm aware that I can just use blank=False to ensure that on a form level it > will never be allowed to be empty. But I want a strong, fully tested, > business model from the beginning. > > As this is a CharField, according to the docs, I cannot use null=True since > empty string will get stored as empty strings and not as NULL. > > Is this an appropriate way of modeling my models, or are there other > solutions ? > > Regards, > > Jonas. > > > -- > You received this message because you are subscribed to the Google Groups > "Django users" group. > To post to this group, send email to django-users@googlegroups.com. > To unsubscribe from this group, send email to > django-users+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/django-users?hl=en. > -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
