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Context Processor for Django Site
def add_wedding_context(request):
    id_ = request.GET.get('wedding_id', None)
    wedding = None
    if id_ is not None:
        try:
            wedding = Wedding.objects.get(id=id_)
        except Wedding.DoesNotExist:
            pass
    return {'wedding':wedding}

from django.utils.functional import SimpleLazyObject
from functools import partial

def get_wedd_or_none(id_):
    try:
        return Wedding.objects.get(id=id_)
    except Wedding.DoesNotExist:
        return None

def add_wedding_context(request):
    id_ = request.GET.get('wedding_id', None)
    if id_ is not None:
        lazy = SimpleLazyObject(partial(get_wedd_or_none, id_))
        return {'wedding': lazy}
    else:
        return {'wedding': None}

class ViewWedding(DetailView):
  model = Wedding
  pk_url_kwarg = 'wedding_id'
  template_name = 'you-template.html'
  context_object_name = 'wedding'

import re

def add_wedding_ring(request):
  if re.match('.*/id=.*',request.get_full_path()):
     return {'wid':Wedding.objects.get(id=wedding_id)}
  return {}