django ImageField ignores upload_to kwarg

I've fallen into a problem with resolving the correct url of uploaded images. I've made sure that my routing/templates work correctly and the problem is somewhere inside the model layer.

This is my model class:

from django.db import models

from tinymce.models import HTMLField

class Article(models.Model):

    """News article, displayed on homepage to attract users"""

    class Meta:

        db_table = 'article'

    title = models.CharField(max_length=64)

    headline = models.CharField(max_length=255)

    content = HTMLField()

    image = models.ImageField(upload_to = 'articles', null=True, blank=True)

    active = models.BooleanField()

    created_at = models.DateTimeField()

    def __unicode__(self):

        return self.title

Now when I open my django shell, I get wrong url/path values. The 'upload_to' kwarg (defined in Article model for image field) is ignored and I don't know why.

$ ./manage.py shell

Python 2.7.3 (default, Aug  1 2012, 05:14:39) 

[GCC 4.6.3] on linux2

Type "help", "copyright", "credits" or "license" for more information.

(InteractiveConsole)

>>> from articles.models import Article

>>> Article.objects.all().get(pk=1)

<Article: Blackened Recordings Launches>

>>> Article.objects.all().get(pk=1).image.path

u'/var/www/django/djninja/djninja/media/slide-03.jpg'

>>> Article.objects.all().get(pk=1).image.url

'/media/slide-03.jpg'

I've defined MEDIA and MEDIA_ROOT in the settings.py:

PROJECT_DIR = os.path.dirname(__file__)

MEDIA_ROOT = os.path.join(PROJECT_DIR, "media")

MEDIA_URL = '/media/'

I expect the path/url to be media/articles/slide.jpg instead of media/slide.jpg

Thank you in advance for any suggestions!

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