用Django'编写if-else语句；s Admin.py

如果用户是新用户，并且似乎不知道如何在admin.py中编写if-else语句，我希望让我的Django管理员折叠某些信息

这里有一个一般的例子

models.py

class User(models.Model):
    name = models.CharField()
    is_new = models.BooleanField(default=True)

class NewUserInfo(models.Model):
    join_date = models.CharField()
'''

admin.py
'''
class NewUserInfoInline(admin.StackedInline):
    model = NewUserInfo
    # Here is where I'd like the if else statement I believe
    # Something like this
    **if user.is_new is False:
        classes = ['collapse']**

class UserAdmin(admin.ModelAdmin):
    inlines = [NewUserInfoInline]