title: Django Migration Error: Column does not exist
body: <p>Python 3, Django 1.8.5, Postgres</p>
  
  <p>I have a model <code>Sites</code> that has been working fine. I recently tried to add a field, airport_code, and migrate the data.</p>
  
  <pre><code>class Site(BaseModel):
  
    objects = SiteManager()
  
    name = models.CharField(max_length=200, unique=True)
    domain = models.CharField(max_length=200, unique=True)
    weather = models.CharField(max_length=10)
    nearby_sites = models.ManyToManyField('self', symmetrical=False, blank=True)
    users = models.ManyToManyField(settings.AUTH_USER_MODEL, blank=True)
    facebook = models.URLField(max_length=200)
    twitter = models.URLField(max_length=200)
    header_override = models.TextField(blank=True)
    email_header_override = models.TextField(blank=True)
    timely_site_tag_id = models.IntegerField()
    timely_featured_tag_id = models.IntegerField()
    timely_domain = models.CharField(max_length=255)
    sitemap_public_id = models.CharField(max_length=255)
    state = models.CharField(max_length=24)
    airport_code = JSONField()
  </code></pre>
  
  <p>However, when I ran <code>makemigrations</code> I got an error:</p>
  
  <p><code>django.db.utils.ProgrammingError: column sites_site.airport_code does not exist
  LINE 1: ..._site"."sitemap_public_id", "sites_site"."state", "sites_sit...</code></p>
  
  <p>Of course, this doesn't make sense, because the column obviously does not exist when I'm trying to create it within the migration.</p>
  
  <p>I have seen many questions about this bug on Stack Overflow that are unanswered, or have a solution to manually create the migration file, or destroy and rebuild the database. This is not an okay solution.</p>