Repaired an oversight from [8772] that let made certain types of fields with...

    def formfield(self, form_class=forms.CharField, **kwargs):

        "Returns a django.forms.Field instance for this database Field."

        defaults = {'required': not self.blank, 'label': capfirst(self.verbose_name), 'help_text': self.help_text}

        if self.has_default():

            defaults['initial'] = self.get_default()

        if self.choices:

            form_class = forms.TypedChoiceField

            # Fields with choices get special treatment. 

            include_blank = self.blank or not (self.has_default() or 'initial' in kwargs)

            defaults['choices'] = self.get_choices(include_blank=include_blank)

            defaults['coerce'] = self.to_python

            if self.null:

                defaults['empty_value'] = None

            kwargs.pop('max_length', None)

        if self.has_default():

            defaults['initial'] = self.get_default()

            form_class = forms.TypedChoiceField

            # Many of the subclass-specific formfield arguments (min_value,

            # max_value) don't apply for choice fields, so be sure to only pass

            # the values that TypedChoiceField will understand.

            for k in kwargs.keys():

                if k not in ('coerce', 'empty_value', 'choices', 'required',

                             'widget', 'label', 'initial', 'help_text',

                             'error_messages'):

                    del kwargs[k]

        defaults.update(kwargs)

        return form_class(**defaults)

    writer = models.ForeignKey(Writer)

    article = models.TextField()

    categories = models.ManyToManyField(Category, blank=True)

    status = models.IntegerField(choices=ARTICLE_STATUS, blank=True, null=True)

    status = models.PositiveIntegerField(choices=ARTICLE_STATUS, blank=True, null=True)

    def save(self):

        import datetime