django – 为什么我的文件不会保存到实例(它保存到磁盘……)？

2019年8月3日 131次阅读

我可以将我的文件保存到我告诉它的磁盘,但无法将其保存到实例,我没有丝毫想法为什么！

models.py

    class Song(models.Model):
        name = models.CharField(max_length=50)
        audio_file = models.FileField(upload_to='uploaded/music/', blank=True)

views.py

    def create_song(request, band_id):
        if request.method == 'POST':
            band = Band.objects.get(id=band_id)
            form = SongForm(request.POST, request.FILES)
            if form.is_valid():
                handle_uploaded_file(request.FILES['audio_file'])
                form.save()
                return HttpResponseRedirect(band.get_absolute_url)
        else:
            form = SongForm(initial={'band': band_id})
        return render_to_response('shows/song_upload.html', {'form': form}, context_instance=RequestContext(request))

handle_uploaded_file

    def handle_uploaded_file(f):
        ext = os.path.splitext(f.name)[1]
        destination = open('media/uploaded/music/name%s' %(ext), 'wb+')
        for chunk in f.chunks():
            destination.write(chunk)
        destination.close()

song_upload.html(相关部分)

    {% block main %}
    {{band.name}}
        <form enctype="multipart/form-data" method="post" action="">{% csrf_token %}
           {{ form.as_p}}
           <input type="submit" value="Add song" />
        </form>
    {% endblock %}

forms.py

    class SongForm(forms.ModelForm):
        band = forms.ModelChoiceField(queryset=Band.objects.all(), widget=forms.HiddenInput) 
        def clean_audio_file(self):
            file = self.cleaned_data.get('audio_file',False)
            if file:
                if file._size > 10*1024*1024:
                    raise forms.ValidationError("Audio file too large ( > 10mb)")
                if not file.content_type in ["audio/mp3", "audio/mp4"]:
                    raise forms.ValidationError("Content type is not mp3/mp4")
                if not os.path.splitext(file.name)[1] in [".mp3", ".mp4"]:
                    raise forms.ValidationErorr("Doesn't have proper extension")
            else:
                raise forms.ValidationError("Couldn't read uploaded file")
        class Meta:
            model = Song

文件就在媒体/上传/音乐中,但是在admin audio_file是空白的,如果我为audio_file设置了blank = False(这是我想做的),我被告知这个字段是必需的.是什么赋予了？？

提前致谢！现在已经有一段时间了,文档对我来说很轻松(newb).

最佳答案 clean_audio_file应返回此特定字段的已清理数据,因此您需要向其添加返回文件！

从django’s documentation开始：

Just like the general field clean()
method, above, this method should
return the cleaned data, regardless of
whether it changed anything or not.

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