Django 完整性错误； NOT NULL 约束失败

Question

我正在尝试保存模型实例，但无济于事。

下面是我的模型；

class AudioFile(models.Model):
    name = models.CharField(max_length=100,default='')
    audio_file = models.FileField()
    uploader = models.ForeignKey(User,default='')

    def __unicode__(self):
        return self.name    

我有下面的表格；

class AudioFileForm(forms.ModelForm):
    class Meta:
        model = AudioFile
        fields = ['name', 'audio_file']

    def clean_audio_file(self):
        audio = self.cleaned_data['audio_file']
        if audio:
            if audio._size > 5*1024*1024:
                raise ValidationError("File too large ( > 5mb )")
            if os.path.splitext(audio.name)[1] != ".mp3":
                raise ValidationError("We only support mp3!")
            return audio
        else:
            raise validationError("Couldn't read uploaded file")

我有以下 View 来处理提交的表单；

form = AudioFileForm(request.POST, request.FILES)
    if form.is_valid():
        form.cleaned_data['uploader'] = request.user //view requires login
        form.save()
        return HttpResponseRedirect(
            reverse('home_audio',kwargs={'pk':audio_file.pk})
            )
    else:
        return HttpResponse(form.errors)

但是在提交时我得到了错误； /uploadaudio 处的 IntegrityError
NOT NULL 约束失败:stationrunner_audiofile.uploader_id /uploadaudio 是与 View 对应的 URL，stationrunner 是我的应用名称。

有人请帮忙。

Answer 1

尝试改变 View :

form = AudioFileForm(request.POST, request.FILES)
if form.is_valid():
    audio_file = form.save(commit=False) // This will not hit the database, and no IntegrityError will be raised
    audio_file.uploader = request.user  // Tack on the user, 
    audio_file.save()
    return HttpResponseRedirect(
        reverse_lazy('home_audio',kwargs={'pk':audio_file.pk}) // Use reverse lazy to prevent circular import issues.
    )
else:
    return HttpResponse(form.errors)

您还可以修复模型的一些问题:

from django.conf import settings
from django.db import models

class AudioFile(models.Model):
    name = models.CharField(max_length=100) // If the field is not allowed to be blank, the default blank does not make sense.
    audio_file = models.FileField(upload_to="audio_files") // Without this parameter file field does not work.
    uploader = models.ForeignKey(settings.AUTH_USER_MODEL) // This should reference the user model declared in your settings file.

    def __unicode__(self):
        return self.name