python - 保存对象时“MyModel”对象不可迭代(Django)

Question

当我尝试编辑这个对象时，出现上述错误。如果我使用表单中所需的值创建字典，它只会保存一个新对象，而不会覆盖当前对象。

View .py

@login_required
def edit_song(request, song_id):
    song = get_object_or_404(Song, pk=song_id)

    form = SongForm(instance=Song.objects.get(id=song_id))

    if request.method == 'POST':
        form = SongForm(data=request.POST, initial=song)
        if form.is_valid():
            obj = form.save()

            obj.save()
            return HttpResponseRedirect('/music-manager/song/' + str(obj.pk))

表单.py

class SongForm(forms.ModelForm):
    class Meta:
        model = Song
        fields = ['title', 'lyrics', 'notes', 'key', 'chords', 'video', 'audio']

    def __init__(self, *args, **kwargs):
        super(SongForm, self).__init__(*args, **kwargs)
        for visible in self.visible_fields():
            visible.field.widget.attrs['class'] = 'form-control'

Answer 1

您应该为 POST 请求和 GET 请求设置 instance。

song = get_object_or_404(Song, pk=song_id)
form = SongForm(instance=song)

if request.method == 'POST':
    form = SongForm(data=request.POST, instance=song)
    if form.is_valid():
        ...

您不需要为 POST 请求设置 initial，所以我已将其删除。