Django: Httpresponse with file object and updating field value - django

Question

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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Answer 1

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')