Django - Accessing through ManyToMany extra field in template

Question

I have the following Model Structures :

class Project(models.Model):
    title       = models.CharField(max_length = 100)
    publish     = models.BooleanField()
    cover       = models.ForeignKey(GenericMedia, related_name='+')
    media       = models.ManyToManyField(GenericMedia, through='AssocProjectMedia')
    credits     = models.ManyToManyField(AssocTitleName)

class GenericMedia(models.Model):
    limit           = models.Q(model = 'Image') | models.Q(model = 'Other')
    content_type    = models.ForeignKey(ContentType, limit_choices_to = limit)
    object_id       = models.PositiveIntegerField()
    content_object  = generic.GenericForeignKey('content_type', 'object_id')

    def __unicode__(self):
        return u"%s" % os.path.basename(self.content_object.url.name)

    def instance(self):
        return self.content_object.__class__.__name__


class AssocProjectMedia(models.Model):
    project     = models.ForeignKey(Project)
    media       = models.ForeignKey(GenericMedia)

    position    = models.PositiveSmallIntegerField()
    grid_size   = models.PositiveSmallIntegerField(null = True, blank = True)

    class Meta:
        ordering = ['position']

I have been trying for a while to get the position data (includes in AssocProjectMedia) in my template with the following :

in my view :

project = get_object_or_404(Project, slug=project_slug)
    return render(request, 'projects/projects_details.html', {"project":project})

in my template :

{% for media in project.media_set.all %}
...
{% endfor %}

But this doesn't work, nothing appear.

If instead I write:

{% for media in project.media.all %}
...
{% endfor %}

I will get my media data but not the one included in the through model (AssocProjectMedia).

If anyone has an idea on how to do that...

Answer 1

Try this:

{% for assoc_media in project.assocprojectmedia_set.all %}
    {{assoc_media.position}}
    {# or whatever field #}
{% endfor %}