class VideoForm(forms.ModelForm):
    video_file = forms.FileField()
    name = forms.CharField()
    description = forms.CharField()
    preview = forms.FileField()
    category_id = forms.ModelChoiceField(queryset=Category.objects)

    def save(self, commit=True):
        video_file = self.cleaned_data.get('video_file', None)
        preview_file = self.cleaned_data.get('preview_url', None)
        video_key = save_video(video_file)
        preview_key = save_img(preview_file)
        name = self.cleaned_data.get('name', None)
        description = self.cleaned_data.get('description', None)
        category_id = self.cleaned_data.get('category_id', None)
        video = Video()
        # video.id = ???????????
        video.url = video_key
        video.name = name
        video.description = description
        video.preview_url = preview_key
        video.category_id = category_id
        Video.save(video)
        return super(VideoForm, self).save(commit=False)

    class Meta:
        fields = '__all__'
        model = Video