如何为 ModelAdmin 中的自定义字段分配初始值？

Question

我正在尝试通过模型中的 onetonefield 扩展 django 用户身份验证。这是模型：

from django.db import models
from django.contrib.auth.models import User
from django.db.models.signals import post_save
from django.dispatch import receiver


class Profile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    nim = models.CharField(max_length=10, blank=True)

    def __str__(self):
        return self.user.username

使用基本管理面板，我可以先创建用户实例，然后再创建个人资料。但我在管理面板上使用自定义表单，所以我可以在一个表单上创建它。这是表单外观：

Profile add form

这是forms.py

from django import forms
from django.contrib.auth.models import User

from .models import Profile  


class ProfileForm(forms.ModelForm):
    username = forms.CharField(required=False, max_length=150)
    password = forms.CharField(required=False, max_length=50, widget=forms.PasswordInput)

    class Meta:
        model = Profile
        fields = ('username', 'password', 'nim')

这是 admin.py

from django.contrib import admin
from django.contrib.auth.models import User

from .forms import ProfileForm
from .models import Profile


class ProfileAdmin(admin.ModelAdmin):
    form = ProfileForm

    def save_model(self, request, obj, form, change):
        username = form.cleaned_data['username']
        password = form.cleaned_data['password']
        user = User.objects.create_user(username=username, password=password)
        user.save()
        obj.user = user
        obj.save()


admin.site.register(Profile, ProfileAdmin)

有了这些，我就可以创建配置文件实例了。但是当我尝试更改/编辑配置文件时，它没有显示用户名和密码字段的初始值，只有 nim 字段显示。

empty username and password field

感谢您的帮助

Answer 1

试试这个：

class ProfileAdmin(admin.ModelAdmin):
    form = ProfileForm
    # ...
    def get_form(self, request, obj=None, *args, **kwargs):
        form = super(ProfileAdmin, self).get_form(request, *args, **kwargs)
        #find the user via user profile forien key
        the_user = User.objects.filter(pk=Profile.user.pk)
        # Initial values
        form.base_fields['username '].initial = the_user.username
        return form

也试试这个，看看差异：（字段仅在超级调用后才存在）

        form.fields['username '].initial = the_user.username