djadhere/adhesions/middleware.py

from django.core.exceptions import ImproperlyConfigured
from django.core import serializers

from adhesions.models import Corporation


class CorporationMiddleware:
    def __init__(self, get_response):
        self.get_response = get_response

    def __call__(self, request):
        if request.user.is_authenticated:
            if 'corporations' not in request.session:
                corporations = Corporation.objects.filter(members=request.user)
                request.session['corporations'] = serializers.serialize('json', corporations, fields=('pk', 'social_reason',))
            request.corporations = serializers.deserialize('json', request.session['corporations'])
        return self.get_response(request)