Django admin - 如何在自定义管理表单中为多对多字段添加绿色加号

问题描述

当我在表单中定义多选字段(照片)时，用于在管理表单中添加新实例的绿色加号按钮消失了.即，删除带有定义的行 (photos = ...) 会使加号出现.但是，为了使用自定义字段/小部件，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)

我查看了 Django 源代码，似乎我必须将我的小部件包装在 RelatedFieldWidgetWrapper 中，但我还没有完全理解它.感谢任何帮助！

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 和这个 post 我得到了以下结果.

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

模型管理员:

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)

还有我的表格:

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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