guardian.exceptions.WrongAppError: Cannot determine content type

django框架使用guardian的get_objects_for_group()方法时,传入了group及perms,如下:

创建模型类:

# homepage
# models.py
class Equipment(models.Model):
    name = models.CharField(max_length=25, default='')
    
    class meta:
        db_table = 'equipment'
        permissions = (
            ('get_equip', '查看装备'),
            ('update_equip', '修改装备'),
            ('delete_equip', '删除装备'),
            ('add_equip', '添加装备'),
        )

调用guardian查询已有权限对应的对象:

# views.py
from django.contrib.auth.models import Group
from homepage.models import Equipment
from guardian.shortcuts import assign_perm, get_objects_for_group

group = Group.objects.get(id=2)
perms = get_objects_for_group(group, 'get_equip')	# <<== 该行错误

然后抛出了异常:

guardian.exceptions.WrongAppError: Cannot determine content type

中文翻译意为:

无法确定内容类型

解析: content type在django权限模块里代表的是模型类相关的标识,推测是传入的perms参数格式不对导致没有找到预期的模型类,简单分析并尝试后,发现正确的格式应该是要带上对应模型类所在的app的名字,它才能找到模型类

正确的写法是:

group = Group.objects.get(id=2)
perms = get_objects_for_group(group, 'homepage.get_equip')	# <<== 该行修改

结果展示:

>>> perms = get_objects_for_group(group, 'homepage.get_equip')
>>> perms
, ]>
>>>