after.py

from django.template.response import TemplateResponse
from portfolio.models import PortfolioItem

class GalleryPageType(cms.PageType):
    
    unique = True
    required = True
    can_use_extra_url = True
    uses_content = True
    uses_extra_content = True
    cachable = True
    changeform_content = "<a href='/admin/portfolio/'>Portfolio</a> will appear here" # TODO don't be lazy hardcoding admin urls
    
    def get_type_object():
        return PortfolioItem
    
    def get_related_instance(request, extra_url=None):
        name = extra_url[0]
        items = PortfolioItem.objects.filter(name=name, active=True)
        return items[0] #TODO uniqueness?
    
    def render(request, context):
    
        page = context['page']
        extra_url = page.extra_url
        context.update({
            'something': something
        })
    
        portfolio_item = get_related_instance(request, extra_url)
        template = 'portfolio_item.html'
        context.update({
            'portfolio': portfolio_item,
            'photos': portfolio_item.photos.filter(active=True),
        })
    
        return TemplateResponse(
            request,
            template,
            context,
        )

before.py

from django.template.response import TemplateResponse
from portfolio.models import PortfolioItem

unique = True
required = True
can_use_extra_url = True
uses_content = True
uses_extra_content = True
cachable = True
changeform_content = "<a href='/admin/portfolio/'>Portfolio</a> will appear here" # TODO don't be lazy hardcoding admin urls

def get_type_object():
    return PortfolioItem

def get_related_instance(request, extra_url=None):
    name = extra_url[0]
    items = PortfolioItem.objects.filter(name=name, active=True)
    return items[0] #TODO uniqueness?

def render(request, context):

    page = context['page']
    extra_url = page.extra_url
    context.update({
        'something': something
    })

    portfolio_item = get_related_instance(request, extra_url)
    template = 'portfolio_item.html'
    context.update({
        'portfolio': portfolio_item,
        'photos': portfolio_item.photos.filter(active=True),
    })


    return TemplateResponse(
        request,
        template,
        context,
    )