Django-Admin中的ForeignKey字段初始值定义 [英] Django - ForeignKey field initial value definition in Admin

问题描述

我有一个 Person 模型，该模型本身具有一个 ForeignKey 字段，称为母亲。
当用户转到添加管理表单时，我想为母亲定义一个初始值，以防万一 GET（'mother'）参数，如果没有，则将其留空。

I have a Person model, which has a ForeignKey field to itself, called mother. When the user goes to the 'add' admin form, I want to define an initial value for mother, in case there is a GET('mother') parameter, or leave it blank, in case there is not.

我实际上有2个问题：

1. 如何在 ModelAdmin 内访问请求？


2. 如何为 ForeignKey 字段定义初始值？

1. How to access request inside ModelAdmin?
2. How to define initial value for a ForeignKey field?

在models.py中：

In models.py:

class Person(models.Model):
    name=models.CharField()
    mother=models.ForeignKey('self')

在admin.py中：

In admin.py:

class  PersonAdminForm(forms.ModelForm):
    class Meta:
        model = Person

class PersonAdmin(admin.ModelAdmin):
    mother = request.GET.get('mother','') #don`t know how to access request

    if mother != '':
        form = PersonAdminForm
        form.initial={'mother':Person.objects.get(id=mother)}

嗯，这没用。即使我只尝试定义一个硬编码的初始值，它也不起作用。

Well, this ain't working. Even if I only try to define a hardcoded initial value, it doesn`t work.

我在做什么错了？

PS：当然，我可能会问错问题，因此，感谢您解决该问题的任何帮助。

PS.: Of course, I may be asking the wrong questions, so I appreciate any help that solves the problem.

推荐答案

我的解决方案：

class PersonAdmin(admin.ModelAdmin):
    form = PersonAdminForm
    # ...
    def get_form(self, request, obj=None, *args, **kwargs):
        form = super(PersonAdmin, self).get_form(request, *args, **kwargs)
        # Initial values
        form.base_fields['mother'].initial = None
        if obj and obj.mother:
            form.base_fields['mother'].initial = obj.mother
        return form

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