title: I did not get the data in APIView
body: <p>In my APIView:</p>
  
  <pre><code>data = {
      "user":user_dict,  # the user_dict have data.
      "account":account_dict  # the account_dict have data too.
        }
  
  serializer = UserInfoSerializer(data=data)
  is_valid = serializer.is_valid()  # the `is_valid` is True
  
  return Response(data=serializer.validated_data, status=HTTP_200_OK)
  </code></pre>
  
  <p>But when I access this APIView, I get nothing.</p>
  
  <p><kbd>  <a href="https://i.stack.imgur.com/muKDH.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/muKDH.jpg" alt="enter image description here"></a></kbd></p>
  
  <p>The <code>UserInfoSerializer</code> code is bellow:</p>
  
  <pre><code>class UserInfoSerializer(Serializer):
      user = serializers.DictField(read_only=True)
      account = serializers.DictField(read_only=True)
  </code></pre>