Question

I have set up a few models as follows:

Page

Gallery

Image

Gallery and Image share a many to many relationship.

Page can have 1 or 0 galleries.

I have created a gallery with a few images and attached it to a page object.

However, I’m having trouble displaying it in a template.

Can anyone help?

My page view looks like this:

def detail(request, page_id):
p = get_object_or_404(Page, pk=page_id)
return render_to_response('page/detail.html', {'page': p},
                      context_instance=RequestContext(request))

And the template:

{% block images %}
{% if page.gallery %}
{% for image in page.gallery.image_set.all %}
<a rel="gallery" href="{{ STATIC_URL }}{{ image.image }}"></a>
{% endfor %}
{% endif %}
{% endblock %}`

If I try to output some text within the IF block it comes out OK but not within the loop.

Any advice on getting it to work / generally tidying this up would be greatly appreciated.

Thanks.

Answer 1

If the Gallery-Image relationship is many to many I’m guessing you have an m2m field on your Gallery model, where the m2m manager is the field itself. The manager can be queried just like any other QuerySet: model_instance.mym2mfield.filter().

If your ManyToManyField is called images on the Gallery model, your template would look like this:

{% for image in page.gallery.images.all %}
    <a rel="gallery" href="{{ STATIC_URL }}{{ image.image }}"></a>
{% endfor %}

If your ManyToManyField is on your Image model, the default name would be as you describe, unless you specified a related_name in which case you’d use that name.

{% for image in page.gallery.image_set.all %}