'NoneType'对象没有属性'user' [英] 'NoneType' object has no attribute 'user'

问题描述

models.py

models.py

class Report(models.Model):
    user = models.ForeignKey(User, null=False)
    photo_files_attached = models.BooleanField('Photos', default=False)

views.py

def media(request):
    user = request.user  
    try:

        report = Report.objects.get(user=user.id)
    except:
        report = None

    report_dir = str(report.user.id) + '/' + str(report.id)
    output_dir = settings.MEDIA_ROOT + '/' + report_dir
    imagelist = []
    if os.path.exists(output_dir):
        os.chdir(output_dir)
        for files in os.listdir("."):
            for extension in JPEG_ALLOWED:
                if files.endswith(extension):
                    image_with_path = report_dir + '/' + files
                    imagelist.append(image_with_path)
    return render(request, 'incident/media.html',
                  {
                   'newreport_menu': True,
                   'report':report,

                 })   

我正在尝试上传图像文件并将其保存到数据库，得到以下错误'NoneType'对象没有属性'user'

I am trying to upload the image file and save it to database,getting the below error "'NoneType' object has no attribute 'user'"

推荐答案

似乎

Report.objects.get(user=user.id)

给你一个 EmptyQuerySet

有问题的用户可能没有任何关联的报告实例。

The user in question probably hasn't got any associated Report instances yet.

您可以使用 get_or_create

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