创建模型表单以从Django中的自定义字段获取数据

Question

因此，我正在从事这个项目，我正在使用JavaScript执行到S3存储桶的上传，为此，我创建了一个小部件并创建了带有URLField的ModelForm。我想使用要用于保存在模型中的URL字段（由Javascript在运行时设置）。

我的代码如下：

widgets.py

class S3DirectWidget(widgets.TextInput):

    class Media:
        js = (
            's3direct/js/bundled.js',
            'https://cdn.jsdelivr.net/npm/js-cookie@2/src/js.cookie.min.js',
        )
        css = {
            'all': (
                's3direct/css/bootstrap-progress.min.css',
                's3direct/css/styles.css',
            )
        }
    def __init__(self, *args, **kwargs):
        self.upload_to = kwargs.pop('upload_to', None)
        super(S3DirectWidget, self).__init__(*args, **kwargs)

    def render(self, name, value, attrs=None, **kwargs):
        if value:
            file_name = os.path.basename(urlunquote_plus(value))
        else:
            file_name = ''

        tpl = os.path.join('s3direct', 's3direct-widget.tpl')
        output = render_to_string(tpl, {
            'signed_url': reverse('s3direct'),
            'element_id': self.build_attrs(attrs).get('id', '') if attrs else '',
            'file_name': file_name,
            'upload_key': os.path.join(self.upload_to, file_name),
            'file_url': value or '',
            'name': name,
            'style': self.build_attrs(attrs).get('style', '') if attrs else '',
        })

        return mark_safe(output)

models.py

class Kitten(models.Model):
    video = models.URLField(editable=False)

forms.py

class S3DirectUploadForm(forms.ModelForm):
    misc = forms.URLField(widget=S3DirectWidget(upload_to='carousel/'))

    class Meta:
        model = Kitten
        exclude = ('video',)

    def save(self, commit=False):
        super(S3DirectUploadForm, self).__init__(commit)

admin.py

class KittenAdmin(admin.ModelAdmin):
    form = S3DirectUploadForm

admin.site.register(Kitten, KittenAdmin)

我的目标是修改misc（FormField）运行时并将其替换为video（ModelField）以保存对象。