title: django makemigrations error "no such column"
body: <p>I am developing a Django project with REST Framework. It all worked well before, but all of a sudden I can't add any new model fields:
  If I add any new field even if the most simple one like this:</p>
  
  <pre><code>    def_episode = models.IntegerField(blank=True, null=True)
  </code></pre>
  
  <p>And <code>manage.py makemigrations</code>, this will happen:</p>
  
  <pre><code>Traceback (most recent call last):
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
      return self.cursor.execute(sql, params)
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\django\db\backends\sqlite3\base.py", line 383, in execute
      return Database.Cursor.execute(self, query, params)
  sqlite3.OperationalError: no such column: novelrecorder_novel.def_episode
  
  The above exception was the direct cause of the following exception:
  
  Traceback (most recent call last):
    File "manage.py", line 21, in &lt;module&gt;
      main()
    File "manage.py", line 17, in main
      execute_from_command_line(sys.argv)
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\django\core\management\__init__.py", line 381, in execute_from_command_line
      utility.execute()
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\django\core\management\__init__.py", line 375, in execute
      self.fetch_command(subcommand).run_from_argv(self.argv)
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\django\core\management\base.py", line 323, in run_from_argv
      self.execute(*args, **cmd_options)
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\django\core\management\base.py", line 361, in execute
      self.check()
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\django\core\management\base.py", line 390, in check
      include_deployment_checks=include_deployment_checks,
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\django\core\management\base.py", line 377, in _run_checks
      return checks.run_checks(**kwargs)
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\django\core\checks\registry.py", line 72, in run_checks
      new_errors = check(app_configs=app_configs)
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\django\core\checks\urls.py", line 40, in check_url_namespaces_unique
      all_namespaces = _load_all_namespaces(resolver)
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\django\core\checks\urls.py", line 57, in _load_all_namespaces
      url_patterns = getattr(resolver, 'url_patterns', [])
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\django\utils\functional.py", line 80, in __get__
      res = instance.__dict__[self.name] = self.func(instance)
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\django\urls\resolvers.py", line 584, in url_patterns
      patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\django\utils\functional.py", line 80, in __get__
      res = instance.__dict__[self.name] = self.func(instance)
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\django\urls\resolvers.py", line 577, in urlconf_module
      return import_module(self.urlconf_name)
    File "C:\Users\daichou\AppData\Local\Programs\Python\Python37-32\lib\importlib\__init__.py", line 127, in import_module
      return _bootstrap._gcd_import(name[level:], package, level)
    File "&lt;frozen importlib._bootstrap&gt;", line 1006, in _gcd_import
    File "&lt;frozen importlib._bootstrap&gt;", line 983, in _find_and_load
    File "&lt;frozen importlib._bootstrap&gt;", line 967, in _find_and_load_unlocked
    File "&lt;frozen importlib._bootstrap&gt;", line 677, in _load_unlocked
    File "&lt;frozen importlib._bootstrap_external&gt;", line 728, in exec_module
    File "&lt;frozen importlib._bootstrap&gt;", line 219, in _call_with_frames_removed
    File "D:\MyProjects\Python\Django\env\mysite\mysite\urls.py", line 19, in &lt;module&gt;
      from novelrecorder import views
    File "D:\MyProjects\Python\Django\env\mysite\novelrecorder\views.py", line 19, in &lt;module&gt;
      from novelrecorder.serializers import NovelSerializer, NovelReadOnlySerializer, \
    File "D:\MyProjects\Python\Django\env\mysite\novelrecorder\serializers.py", line 241, in &lt;module&gt;
      class CharacterCreateSerializer(CharacterSerializer):
    File "D:\MyProjects\Python\Django\env\mysite\novelrecorder\serializers.py", line 245, in CharacterCreateSerializer
      param_key_field_name='novel_id'))
    File "D:\MyProjects\Python\Django\env\mysite\novelrecorder\yd_fields.py", line 23, in __init__
      super().__init__(**kwargs)
    File "D:\MyProjects\Python\Django\env\mysite\novelrecorder\yd_fields.py", line 10, in __init__
      super().__init__(**kwargs)
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\rest_framework\fields.py", line 1404, in __init__
      self.choices = choices
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\rest_framework\fields.py", line 1440, in _set_choices
      self.grouped_choices = to_choices_dict(choices)
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\rest_framework\fields.py", line 142, in to_choices_dict
      for choice in choices:
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\django\db\models\query.py", line 274, in __iter__
      self._fetch_all()
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\django\db\models\query.py", line 1242, in _fetch_all
      self._result_cache = list(self._iterable_class(self))
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\django\db\models\query.py", line 55, in __iter__
      results = compiler.execute_sql(chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size)
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\django\db\models\sql\compiler.py", line 1100, in execute_sql
      cursor.execute(sql, params)
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\django\db\backends\utils.py", line 99, in execute
      return super().execute(sql, params)
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\django\db\backends\utils.py", line 67, in execute
      return self._execute_with_wrappers(sql, params, many=False, executor=self._execute)
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\django\db\backends\utils.py", line 76, in _execute_with_wrappers
      return executor(sql, params, many, context)
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
      return self.cursor.execute(sql, params)
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\django\db\utils.py", line 89, in __exit__
      raise dj_exc_value.with_traceback(traceback) from exc_value
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\django\db\backends\utils.py", line 84, in _execute
      return self.cursor.execute(sql, params)
    File "D:\MyProjects\Python\Django\env\venv\lib\site-packages\django\db\backends\sqlite3\base.py", line 383, in execute
      return Database.Cursor.execute(self, query, params)
  django.db.utils.OperationalError: no such column: novelrecorder_novel.def_episode
  </code></pre>
  
  <p>Without adding any new fields, everything looks ok and the server works.
  Tried to remove the field and <code>makemigrations</code> then <code>migrate</code>, "Nothing needs to change or apply"</p>
  
  <p>Parts of <code>settings.py</code>:</p>
  
  <pre><code>
  INSTALLED_APPS = [
      'novelrecorder.apps.NovelRecorderConfig',
      'django.contrib.admin',
      'django.contrib.auth',
      'django.contrib.contenttypes',
      'django.contrib.sessions',
      'django.contrib.messages',
      'django.contrib.staticfiles',
      'django.contrib.sites',
      'rest_framework',
      'gunicorn',
  ]
  
  MIDDLEWARE = [
      'django.middleware.security.SecurityMiddleware',
      'whitenoise.middleware.WhiteNoiseMiddleware',
      'django.contrib.sessions.middleware.SessionMiddleware',
      'django.middleware.common.CommonMiddleware',
      'django.middleware.csrf.CsrfViewMiddleware',
      'django.contrib.auth.middleware.AuthenticationMiddleware',
      'django.contrib.messages.middleware.MessageMiddleware',
      'django.middleware.clickjacking.XFrameOptionsMiddleware',
  ]
  </code></pre>
  
  <p>The model I attempted to add a new field <code>model.py</code>:</p>
  
  <pre><code>class Novel(CustomNovelModel):
      author = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.PROTECT, related_name='novel_author')
      name = models.CharField(max_length=200)
      is_public = models.BooleanField(default=True)
      def_episode = models.IntegerField(blank=True, null=True)
  
      class Meta:
          ordering = ['name']
          unique_together = ['author', 'name']
  </code></pre>