django - pytest-django:设置用户权限

Question

我使用 pytest 3.0.6 和 pytest-django 3.1.2 为 Django 开发一个库。我的这个非常简单的测试失败了，我不明白发生了什么:

# 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，测试的结果是:

$ 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 ===========================

配置 block ，来自 tox.ini:

[pytest]
DJANGO_SETTINGS_MODULE = testsite.settings
norecursedirs = .git __pycache__ build dist venv* .tox .vscode .cache *.egg-info
python_paths = modernrpc/tests
testpaths = modernrpc/tests
python_files = test_*.py dummy_*.py

以及数据库配置，来自测试设置:

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？

Answer 1

你需要使用字符串'app_label.codename':

Returns True if the user has the specified permission, where perm is in the format "<app label>.<permission codename>".

此外，如果您在上次调用 has_perm 后更改了权限，则必须清除 user._perm_cache 和 user._user_perm_cache 或检索数据库中此用户的新实例，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 会调用 auth 后端，而后端又会先查询这些缓存。