Django: Httpresponse with file object and updating field value

I'm having trouble with saving/updating a value to my database table after the Httpresponse is created and am looking for any tips, help, pointers, etc. I am passing a pdf object from my database to the browser, which works perfectly when the updating code is not in the model. With the code as below, I get a Django Unicode Decode Error. The exception states : "'utf8' codec can't decode bytes in position 564-565: invalid data." The odd thing is that this error does not occur when I am not trying to update the pdf_printed field (meaning no decoding error occurs normally, I get the pdf object to display without this problem), so wondering if those two methods are somehow clashing... seems like the obj.save may be the issue. Again, thanks for any insight to this issue!

I should also add that the update code manages to update the field; it just doesn't display the pdf object.

from django.contrib import admin
from django.contrib.auth.models import User
from django.pdf.models import ABC
from django.http import HttpResponse


class ABCAdmin(admin.ModelAdmin):

    actions = ['print_selected_pdf']

    def get_user(self):
        return '%s'%(self.user.username)

    def create_pdf(self, queryset):
        response = HttpResponse(mimetype="application/pdf")
        response['Content-Disposition'] = 'attachment; filename=form.pdf'

        for obj in queryset:
            response.write(obj.form)
            #update the pdf_printed to true
            obj.pdf_printed=True
            obj.save()
        return response

    def print_selected_pdf(self, request, queryset):
        # prints the pdfs for those that are selected,
        # regardless if the pdf_printed field is true or false
        qs = queryset.filter(pdf_printed__exact=0)
        return self.create_pdf(qs)

    print_selected_pdf.short_description = "Print PDF"

admin.site.register(ABC, ABCAdmin)

Traceback:

Environment:

Request Method: POST
Request URL: http://127.0.0.1:8000/admin/pdf/abc/
Django Version: 1.1
Python Version: 2.5.2
Installed Applications:
['django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.sites',
 'django.contrib.admin',
 'djangostuff.pdf']
Installed Middleware:
('django.middleware.common.CommonMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware')


Traceback:
File "/usr/lib/python2.5/site-packages/django/core/handlers/base.py" in get_response
  92.                 response = callback(request, *callback_args, **callback_kwargs)
File "/usr/lib/python2.5/site-packages/django/contrib/admin/options.py" in wrapper
  226.                 return self.admin_site.admin_view(view)(*args, **kwargs)
File "/usr/lib/python2.5/site-packages/django/views/decorators/cache.py" in _wrapped_view_func
  44.         response = view_func(request, *args, **kwargs)
File "/usr/lib/python2.5/site-packages/django/contrib/admin/sites.py" in inner
  186.             return view(request, *args, **kwargs)
File "/usr/lib/python2.5/site-packages/django/contrib/admin/options.py" in changelist_view
  912.             response = self.response_action(request, queryset=cl.get_query_set())
File "/usr/lib/python2.5/site-packages/django/contrib/admin/options.py" in response_action
  694.             response = func(self, request, queryset.filter(pk__in=selected))
File "/home/user/django/djangostuff/../djangostuff/pdf/admin.py" in print_selected_pdf
  50.         return self.create_pdf(qs)
File "/home/user/django/djangostuff/../djangostuff/pdf/admin.py" in create_pdf
  43.             obj.save()
File "/usr/lib/python2.5/site-packages/django/db/models/base.py" in save
  410.         self.save_base(force_insert=force_insert, force_update=force_update)
File "/usr/lib/python2.5/site-packages/django/db/models/base.py" in save_base
  474.                         rows = manager.filter(pk=pk_val)._update(values)
File "/usr/lib/python2.5/site-packages/django/db/models/query.py" in _update
  444.         return query.execute_sql(None)
File "/usr/lib/python2.5/site-packages/django/db/models/sql/subqueries.py" in execute_sql
  120.         cursor = super(UpdateQuery, self).execute_sql(result_type)
File "/usr/lib/python2.5/site-packages/django/db/models/sql/query.py" in execute_sql
  2369.         cursor.execute(sql, params)
File "/usr/lib/python2.5/site-packages/django/db/backends/util.py" in execute
  22.             sql = self.db.ops.last_executed_query(self.cursor, sql, params)
File "/usr/lib/python2.5/site-packages/django/db/backends/__init__.py" in last_executed_query
  213.             u_params = tuple([to_unicode(val) for val in params])
File "/usr/lib/python2.5/site-packages/django/db/backends/__init__.py" in <lambda>
  211.         to_unicode = lambda s: force_unicode(s, strings_only=True)
File "/usr/lib/python2.5/site-packages/django/utils/encoding.py" in force_unicode
  92.         raise DjangoUnicodeDecodeError(s, *e.args)

Exception Type: DjangoUnicodeDecodeError at /admin/pdf/abc/
Exception Value: 'utf8' codec can't decode bytes in position 564-565: invalid data. 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R\n>>\n/ProcSet [ /PDF /Text ]\n>>\nendobj\nxref\n0 19\n0000000000 65535 f \n0000000009 00000 n \n0000000074 00000 n \n0000000175 00000 n \n0000000224 00000 n \n0000000365 00000 n \n0000000508 00000 n \n0000004748 00000 n \n0000004880 00000 n \n0000004967 00000 n \n0000005168 00000 n \n0000005423 00000 n \n0000005890 00000 n \n0000006160 00000 n \n0000006616 00000 n \n0000006880 00000 n \n0000007085 00000 n \n0000007328 00000 n \n0000010535 00000 n \ntrailer\n<<\n/Size 19\n/Root 3 0 R\n/Info 2 0 R\n>>\nstartxref\n10668\n%%EOF\n' (<type 'str'>)

Currently Django doesn't support storing binary data in the database. I guess you inserted your data some other way. Anytime you call save() on your model containing binary data, you'll get a UnicodeDecodeError exception.

Anyway, as you state in your comment, using QuerySet.update works (since the value of this field isn't submitted to the database). If your model has the auto-generated id AutoField, you can try something like this as a workaround:

ABC.objects.filter(pk=obj.pk).update(pdf_printed='1')