title: Django Integrity Error : Not Null constraint failed
body: <p>I am trying to make a blog like website.</p>
  
  <p>Here is my <code>models.py</code>:</p>
  
  <pre><code>class upload(models.Model):
      username = models.CharField(max_length=100)
      user = models.ForeignKey(settings.AUTH_USER_MODEL,default=1)
      title = models.CharField(max_length=100)
      description = models.CharField(max_length=300,default=None)
      content = models.TextField(default=None,blank=True,null=True)
      docFile = models.FileField(default=None,blank=True,null=True)
      timestamp = models.DateTimeField(auto_now=False,auto_now_add=True)
  
      def __unicode__(self):
             return self.title
  
      class Meta:
             ordering = ["-timestamp"]
  
      def get_absolute_url(self):
             return reverse("detail",kwargs={"id":self.id})
  </code></pre>
  
  <p>I have changed my <code>models.py</code> to include the TextField(content) which was not present before</p>
  
  <p>.Then I ran the command <code>python manage.py makemigrations</code> which executed successfully.After that when I run <code>python manage.py migrate</code>,I am getting </p>
  
  <blockquote>
    <p>IntegrityError:NOT NULL constraint failed:uploads_upload.content</p>
  </blockquote>
  
  <p>(uploads is the name of my app)</p>
  
  <p>Reading some previous SO answers to this error,I have also added <code>null=True</code> and <code>blank=True</code> also to my content attribute,still I get the same error.</p>
  
  <p>I am inputting the details through Django forms.Here is my <code>forms.py</code>:</p>
  
  <pre><code>class PostForm(forms.ModelForm):
  #docfile = upload.docFile(required=False)
  class Meta:
      model = upload
      fields = [
      "title",
      "description",
      "username",
      "content",
      "docFile",
      ]
  </code></pre>
  
  <p>Why am I getting this error?</p>