Gets latest related galleries from same section as originating gallery.

    Count defaults to five but can be overridden.

    Usage: {% get_related_galleries gallery <10> %}

def get_related_galleries(gallery, count=5):
    """
    Gets latest related galleries from same section as originating gallery.

    Count defaults to five but can be overridden.

    Usage: {% get_related_galleries gallery <10> %}
    """
    # just get the first cat. If they assigned to more than one, tough
    try:
        cat = gallery.sections.all()[0]
        related = cat.gallery_categories.filter(published=True).exclude(id=gallery.id).order_by('-id')[:count]
    except:
        related = None
    return {'related': related, 'MEDIA_URL': settings.MEDIA_URL}