如何检查list_display如果没有值，显示 - 在Django的管理？

Question

django ver 1.10

如何有条件地检查变量是否为空并显示“ - ”？

即如果get_followers和/或get_following未设置，显示 “ - ”

@admin.register(Application) 
class ApplicationAdmin(admin.ModelAdmin): 

    list_display = [ 
     'name', 
     'get_following', 
     'get_followers', 
     'get_friends', 
     'manager', 
     ] 

Answer 1

这里是list_display的文档： https://docs.djangoproject.com/en/1.10/ref/contrib/admin/#django.contrib.admin.ModelAdmin.list_display

您可以使用此方法。例如：

class Application(models.Model): 
    name = models.CharField(max_length=100) 
    following = ... 
    followers = ... 
    friends = ... 

    def get_following(self): 
     if not self.following: 
      return "-" 
     return self.following 

，并在admin.py你简单地把方法

@admin.register(Application) 
class ApplicationAdmin(admin.ModelAdmin): 

    list_display = [ 
     'name', 
     'get_following', 
     ... 
     ]