django - 这怎么可能使用 list_display=[] 在管理员中调用 OneToOneField 值

Question

我的模特

    class user_profile(models.Model):

    user = models.OneToOneField(User, on_delete=models.CASCADE)
    age = models.IntegerField()

    profile_created = models.DateTimeField(auto_now_add=True, auto_now=False)
    timestamp = models.DateTimeField(auto_now=True, auto_now_add=False)

admin.py

class UserProfileAdmin(admin.ModelAdmin):
list_display = ['user','user.username','profile_created', 'timestamp']
admin.site.register(user_profile, UserProfileAdmin)

它显示以下错误:
ERRORS:
<class 'testapp.admin.UserProfileAdmin'>: (admin.E108) The value of 'list_display[1]' refers to 'user.username', which is not a call
able, an attribute of 'UserProfileAdmin', or an attribute or method on 'testapp.user_profile'.
如何在 admin.py 中获取另一个表值?

Answer 1

根据 PEP8 ，类名通常应使用 CapWords 约定。

class UserProfile(models.Model):
    # your code

此外，要在 DjangoAdmin 中显示用户名，您应该定义一个方法，

from django.core.exceptions import ObjectDoesNotExist


class UserProfileAdmin(admin.ModelAdmin):
    list_display = ['user', 'username', 'profile_created', 'timestamp']

    def username(self, instance): # name of the method should be same as the field given in `list_display`
 try:
 return instance.user.username
 except ObjectDoesNotExist:
 return 'ERROR!!'

admin.site.register(UserProfile, UserProfileAdmin)