Pytest django：设置用户权限

我使用pytest 3.0.6和pytest Django 3.1.2开发Django库。我有一个非常简单的测试失败，我不明白会发生什么：

# test_mytest.py
import pytest
from django.contrib.auth.models import Permission
from django.contrib.contenttypes.models import ContentType


@pytest.mark.django_db
def test_user_has_perm(django_user_model):
    # Create a new user
    john_doe = django_user_model.objects.create_user('johndoe', email='jd@example.com', password='123456')

    # Get or create the permission to set on user
    user_ct = ContentType.objects.get(app_label='auth', model='user')
    p, _ = Permission.objects.get_or_create(content_type=user_ct, codename='delete_user', name="Can delete user")

    # User don't have the permission
    assert john_doe.has_perm(p) is False

    # Set permission to user
    john_doe.user_permissions.add(p)
    assert john_doe.has_perm(p) is True  # ---> FAIL

以防万一，测试结果为：

$ pytest
============================= test session starts =============================
platform win32 -- Python 3.5.3, pytest-3.0.6, py-1.4.32, pluggy-0.4.0
Django settings: testsite.settings (from ini file)
rootdir: D:\Dev\foss\django-modern-rpc, inifile: tox.ini
plugins: pythonpath-0.7.1, django-3.1.2, cov-2.4.0
collected 1 items

modernrpc\tests\test_test_test.py F

================================== FAILURES ===================================
_____________________________ test_user_has_perm ______________________________

django_user_model = <class 'django.contrib.auth.models.User'>

    @pytest.mark.django_db
    def test_user_has_perm(django_user_model):
        # Create a new user
        john_doe = django_user_model.objects.create_user('johndoe', email='jd@example.com', password='123456')

        # Get or create the permission to set on user
        user_ct = ContentType.objects.get(app_label='auth', model='user')
        p, _ = Permission.objects.get_or_create(content_type=user_ct, codename='delete_user', name="Can delete user")

        # User don't have the permission
        assert john_doe.has_perm(p) is False

        # Set permission to user
        john_doe.user_permissions.add(p)
>       assert john_doe.has_perm(p) is True  # ---> FAIL
E       assert False is True
E        +  where False = <bound method PermissionsMixin.has_perm of <User: johndoe>>(<Permission: auth | user | Can delete user>)
E        +    where <bound method PermissionsMixin.has_perm of <User: johndoe>> = <User: johndoe>.has_perm

modernrpc\tests\test_test_test.py:20: AssertionError
========================== 1 failed in 0.32 seconds ===========================

以及测试设置中的DB配置：

BASE_DIR = os.path.dirname(os.path.dirname(__file__))
DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': os.path.join(BASE_DIR, 'modern_rpc.sqlite3'),
    },
}

我做错了什么？

来自：

有perm（perm，obj=None）

如果用户具有指定的权限，则返回True，其中perm的格式为

”

它将在您重新蚀刻对象后工作

#Be aware this only works after Django 1.9+
#https://code.djangoproject.com/ticket/26514
john_doe.refresh_from_db()
#Otherwise use:
john_doe = User.objects.get(pk=john_doe.pk)

您需要使用字符串
'app\u label.codename'
：

如果用户具有指定的权限，则返回True，其中perm的格式为“”

此外，如果您在上次调用
后更改了权限，则必须清除
user.\u perm\u cache
和
user.\u user\u perm\u cache
，或者从数据库中检索此用户的新实例，以确保没有缓存：

 del john_doe._perm_cache
 del john_doe._user_perm_cache 
 # OR
 john_doe = django_user_model.objects.get(username='johndoe')

这是因为
has_perm
将调用auth后端，后者将首先查询这些缓存。
谢谢你，我完全错过了缓存系统的权限。是的。Django让你在那里挖掘代码，因为缓存没有很好的文档记录。
 del john_doe._perm_cache
 del john_doe._user_perm_cache 
 # OR
 john_doe = django_user_model.objects.get(username='johndoe')