CharField false change detection (Null attribute)

[uti_sis@…]

We have a model with CharField? fields without null attribute (Django default appĺies: false)

i.e.

    foo = models.CharField(max_length=250)

Our initial migration shows

        db.create_table(...
            (...),
            ('foo', self.gf('django.db.models.fields.CharField')(max_length=250)),
        ))

We changed models.py without affecting field definitions.
The next migration create lines like this

        db.alter_column('fooapp_footable', 'foo', 
self.gf('django.db.models.fields.CharField')(max_length=250, null=True))

The same happen to all the CharFields?.
We expected to have no change at all (no migration file or an empty one), so this seems to be a bug.

Also, when the migration is applied, the database remains unchanged.

We have:

• PostgreSQL 8.3
• Django 1.2.3

[uti_sis@…]

I think there is a bug in:
version-src: south-0.7.3.tar.gz
file: /modelsinspector.py

def introspector
line 297: kwargs[kwd] = get_value(field, defn)

get_value with parameters field = <django.db.models.fields.CharField? object ...> and defn = ['null', {'default': False}] should return False, but it returns True.

def introspector should return this {'max_length': '250', 'null': 'False'} or {'max_length': '250'} but it returns {'max_length': '250', 'null': 'True'}

All this is generated by freezer.freezer_app function to generate the value of new_defs variable.