Python 保存对象时，“MyModel”对象不可编辑（Django）

当我试图编辑这个对象时，我得到了上面的错误。 如果使用表单中所需的值创建dict，它只会保存一个新对象，而不会覆盖当前对象

views.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))

forms.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'

尝试：

尝试：

您应该为POST请求和GET请求设置实例

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请求设置初始值，所以我已经删除了它。

您应该为POST请求和GET请求设置实例

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请求设置初始值，所以我已经删除了它