Using django-cms, how can I allow the user to specify a background image

Question

I am creating a django-cms site for a client. I would like to do something like:

Answer 1

Great answer Flimm, thanks!

I get an error, however, in the context processor saying that a CMSPlugin object does not have a filerimage attribute. Here's the context processor that works for me:

# in context_processors.py
from cms.models.pluginmodel import CMSPlugin

def cover_image(request):
    page = request.current_page
    if page:
        cover_image_plugin = CMSPlugin.objects.filter(
            placeholder__page=page,
            placeholder__slot='cover_image',
            plugin_type='FilerImagePlugin',
        ).first()
        if cover_image_plugin:
            return {'cover': cover_image_plugin.get_plugin_instance()[0]}
    return {}

Note the change in the but last line. get_plugin_instance retrieves the rightly subclassed instance object as the first entry of a tuple. (I use Django CMS 3.4)

As a last remark, the cover_image placeholder needs to be in a place that is not rendered.