Django Fix "AttributeError: This QueryDict instance is immutable"

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Fix the Django error: "AttributeError: This QueryDict instance is immutable".

from django.contrib.admin.sites import AdminSite     def my_view(request):     admin_site = admin.MyModelAdmin(models.MyModel, AdminSite())     request.GET._mutable = True     request.GET['_popup'] = '1'     request.GET._mutable = False     return admin_site.add_view(request)