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Я использую django версии v1.8 в python 2.7

В таблице у models.py меня есть

 class Diagnosis(models.Model):
    diagnosis_circumstances = models.CharField(max_length=150)
    diagnosis_circumstances_date = models.DateField('Date of diagnosis',null=True,blank=True)
    date_of_input= models.DateField(null=True,blank=True)
    pub_date = models.DateTimeField(auto_now=True)
    author = models.ForeignKey(User)
    patient = models.ForeignKey(Demographic)
  

Когда я пытаюсь показать pub_date поле в forms.py подобном:

 class DiagnosisForm(forms.ModelForm):
    def __init__(self, *args, **kwargs):

        super(DiagnosisForm, self).__init__(*args, **kwargs)
        self.helper=FormHelper(form=self)
        self.helper.field_class = 'col-md-8'
        self.helper.label_class = 'col-md-3'

        # self.helper.form_class = 'forms-horizontal'
        self.helper.layout = Layout(
            Fieldset(
                '<b>Latest update</b>',
                Div(
                    Div('pub_date', css_class='col-md-8'),
                    css_class='row',
                ),
            ),
            FormActions(
                Submit('submit', "Save changes"),
                Submit('cancel',"Cancel")
            ),
        )
        self.helper.form_tag = False
        self.helper.form_show_labels = True

    class Meta:
        model = Diagnosis
        exclude = ['patient', 'author']
        list_display = ('patient', 'pub_date', 'author')
  

Я получаю сообщение:

 WARNING:root:Could not resolve form field 'pub_date'.
Traceback (most recent call last):
  File "C:Python27libsite-packagescrispy_formsutils.py", line 92, in render_f
ield
    field_instance = form.fields[field]
KeyError: u'pub_date'
  

У вас есть какие-либо идеи, как это исправить?