title: django.core.exceptions.FieldError: 'date' cannot be specified for Forum model form as it is a non-editable field
body: <p>Here is my models.py</p>
  <pre><code># Create your models here.
  class Forum(models.Model):
      publisher = models.CharField('Публикатор', max_length=50, default='Anonymous')
      topic = models.CharField('Название', max_length=50)
      text = models.TextField('Текст')
      date = models.DateField(auto_now_add=True)
      comment = models.CharField('Комментарий', max_length=100, default='Комментарий')
      # slug = models.SlugField(max_length=200, unique=True, default='default')
  
      class Meta:
          verbose_name = 'Пост'
          verbose_name_plural = 'Посты'
  
      def __str__(self):
          return self.topic
  </code></pre>
  <p>How to solve such problem, I also tried set editable=True. It didn't help.</p>