Django:带有文件对象和更新字段值的Httpresponse。

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 *ing... seems like the obj.save may be the issue. Again, thanks for any insight to this issue!

在创建了Httpresponse之后，我在为数据库表保存/更新一个值时遇到了麻烦，我正在寻找任何提示、帮助、指针等。我将一个pdf对象从数据库传递到浏览器，当更新代码不在模型中时，它可以很好地工作。使用下面的代码，我得到了Django Unicode解码错误。异常状态:“utf8”编解码器在564-565位置不能解码字节:无效数据。奇怪的是，当我不尝试更新pdf_print字段时，不会出现这个错误(这意味着没有解码错误通常发生，我得到pdf对象，以显示没有这个问题)，所以我想知道这两种方法是否会发生冲突……似乎obj。储蓄可能就是问题所在。再次感谢您对这个问题的任何见解!

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

我还应该添加更新代码设法更新字段;它不显示pdf对象。

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:

回溯:

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. You passed in '%PDF-1.3\n1 0 obj\n<<\n/Kids [ 4 0 R 5 0 R ]\n/Type /Pages\n/Count 2\n>>\nendobj\n2 0 obj\n<<\n/Producer (Python PDF Library \\055 http\\072\\057\\057pybrary\\056net\\057pyPdf\\057)\n>>\nendobj\n3 0 obj\n<<\n/Type /Catalog\n/Pages 1 0 R\n>>\nendobj\n4 0 obj\n<<\n/Parent 1 0 R\n/Contents 6 0 R\n/Resources 7 0 R\n/Rotate 0\n/CropBox [ 0 0 612 792 ]\n/MediaBox [ 0 0 612 792 ]\n/Type /Page\n>>\nendobj\n5 0 obj\n<<\n/Parent 1 0 R\n/Contents 17 0 R\n/Resources 18 0 R\n/Rotate 0\n/CropBox [ 0 0 612 792 ]\n/MediaBox [ 0 0 612 792 ]\n/Type /Page\n>>\nendobj\n6 0 obj\n<<\n/Length 4167\n/Filter /FlateDecode\n>>\nstream\nh\xde\xec[[o\xe36\x16~\xcf\xaf 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1 个解决方案

#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.

目前Django不支持在数据库中存储二进制数据。我猜你是用其他方式插入数据的。当您在包含二进制数据的模型上调用save()时，您将得到一个UnicodeDecodeError异常。

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:

无论如何，在注释中使用QuerySet。更新工作(因为该字段的值没有提交到数据库)。如果您的模型具有自动生成的id AutoField，您可以尝试如下方法:

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