Django管理员 - 如何在自定义管理表单中添加多对多字段的绿色加号 [英] Django admin - How can I add the green plus sign for Many-to-many Field in custom admin form

问题描述

当我以我的形式定义时，用于在管理表单中添加新实例的绿色加号按钮将消失为我的MultiSelect字段（照片）。即，删除与定义（照片= ...）的行使加号出现。然而，为了使用自定义的Field / Widget，我需要弄清楚这一点。

The green plus sign button for adding new instances in the admin form disappears for my MultiSelect field (photos) when I define it in my form. Ie, removing the line with the definition (photos = ...) makes the plus sign appear. However, in order to use a custom Field/Widget I need to figure this out.

class GalleryForm(ModelForm):

    photos = ModelMultipleChoiceField(queryset=Photo.objects.all(), label="Photos")

    def __init__(self, *args, **kwargs):
        super(GalleryForm, self).__init__(*args, **kwargs)

我已经偷看在Django源代码中，似乎我必须将我的小部件包装在一个RelatedFieldWidgetWrapper中，但是我并没有把头靠近。任何帮助都是感谢！

I've peeked at the Django source code and it seems like I have to wrap my widget in a RelatedFieldWidgetWrapper, but I haven't quite gotten my head around it. Any help is apprecietad!

推荐答案

借助lazerscience和 post 我结束了以下。

With the help from lazerscience and this post I ended up with the following.

ModelAdmin：

The ModelAdmin:

class GalleryAdmin(admin.ModelAdmin):

    form = GalleryForm

    def __init__(self, model, admin_site):
        self.form.admin_site = admin_site 
        super(GalleryAdmin, self).__init__(model, admin_site)

我的表单：

class GalleryForm(ModelForm):

    photos = ThumbnailChoiceField(queryset=Photo.objects.all(), label='Photos', widget=MyWidget(), required=False)

    def __init__(self, *args, **kwargs):
        super(GalleryForm, self).__init__(*args, **kwargs)
        rel = ManyToOneRel(self.instance.photos.model, 'id') 
        self.fields['photos'].widget = RelatedFieldWidgetWrapper(self.fields['photos'].widget, rel, self.admin_site) 

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