Django FileField编码 [英] Django FileField encoding

问题描述

我有一个django模型，如下所示:

I have a django model as follows:

class ExportFile(BaseExportFile): 
    created_timestamp = models.DateTimeField(auto_now=True, editable=False)
    data = models.FileField(upload_to='exports')

和一个渲染模板以创建csv文件的视图函数:

and a view function that renders a template to create a csv file:

def create_csv(request):

        context = Context({'data': MyModel.objects.all()})
        rendered = render_to_string('mytemplate.html', context)

        # create tradefile and save
        cf = ContentFile(rendered)

        tf = ExportFile()
        tf.data.save('myfile.csv', cf)

        tf.save()

        response =  HttpResponse(mimetype='text/csv')
        response['Content-Disposition'] = 'attachment; filename=%s' % 'myfile.csv'
        response.write(rendered)

        return response

该视图不仅将csv数据保存到FileField，而且还将其返回给浏览器.我的问题是浏览器文件运行正常，但是保存在模型上的文件大小是原来的两倍，当我使用差异程序时，我可以看到额外的隐藏字符.我认为这一定与mime类型和django自动保存utf8有关，但我只是想不通！

The view not only saves the csv data to a FileField but it also returns it to the browser. The problem I have is the browser file works perfectly, but the file saved on the model is twice the size and when I use a diff program I can see extra hidden characters. I think it must be to do with the mime type vs django auto saving utf8 but I just can't figure it out!

推荐答案

解决了问题！

ContentFile是cStringIO.StringIO的子类-处理ASCII编码的文件.因此，由于django中的所有内容默认均为UTF8，因此该字符串需要编码为ASCII

The ContentFile is a subclass of cStringIO.StringIO - which deals with ASCII encoded files. The string therefore needs to be encoded as ASCII as everything in django is UTF8 by default

cf = ContentFile(rendered.encode('ascii'))

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