title: Why am I getting a IntegrityError at, null value in a column that doesn't exists... Django
body: <p>I am trying to hit an external api, when a user submits a form.
  I am using Django and Postgresql</p>
  <p><strong>My Model</strong></p>
  <pre><code>class League_Mod(models.Model):
      host = models.CharField(max_length=50)
      Espn_League_Id = models.IntegerField(unique = True)
      Espn_S2 = models.CharField(max_length=3000)
      Espn_Swid = models.CharField(max_length=300) 
      bigdata = models.JSONField(default=dict,null=True)
  </code></pre>
  <p><strong>My Serializer</strong></p>
  <pre><code>    class Meta:
          model = League_Mod
          fields = ['host', 'Espn_League_Id','Espn_S2','Espn_Swid','bigdata']
  
  </code></pre>
  <p><strong>Views</strong></p>
  <p>where Owners is a large dictionary.</p>
  <pre><code>league_data = {
              'host' : request.data['host'],
              'Espn_League_Id' :request.data['Espn_League_Id'],
              'Espn_S2' : request.data['Espn_S2'],
              'Espn_Swid' : request.data['Espn_Swid'],
              'bigdata' : Owners
    }
  serializer = LeagueSerializer(data=league_data)
  print(serializer)
  if serializer.is_valid(raise_exception=True):
      serializer.save()
      return  Response(serializer.data)
  </code></pre>
  <p>my print serializer runs, and prints the data correctly.</p>
  <p>But I get an error:</p>
  <pre><code>integrityError at /wel/
  null value in column &quot;hello&quot; of relation &quot;api_league_mod&quot; violates not-null constraint
  DETAIL:  Failing row contains (11, JPFL, 216415, AEAylLD7uSQQ7%2BenPr6av1H%2Fx0Hqbbpn8Jvr91ngxM1ll5ynO685mhN%2BSu..., {D19D67CA-C981-4CA2-8463-AF4111D2E8E2}, {&quot;Person1&quot;: {&quot;2010&quot;: [0, 1, 2, 2, 2, 3, 3, 3, 3, 4, 5, 5, 6,..., null).
  
  </code></pre>
  <p>I am very unclear where the column hello is... and there is no relation to api_league_mod Model, so don't quite understand why my serializer is returning unvalid</p>
  <p>Any insight would be appreciated. Thanks!</p>