问题对象在测试用例断言中是不可迭代的

Question

我正在测试上下文变量是否包含字符串

def test_past_question(self):
    past_question = create_question(question_text='past question',days=-30)
    response = self.client.get(reverse('polls:detail',args=(past_question.id,)))    
    self.assertQuerysetEqual(response.context['question'],'<Question: past question>')

但它抛出以下错误：

（mysite）sugumar@mysitedotcom：~/python/html" target="_blank">html" target="_blank">django/mysite$python manage.py测试轮询正在为别名“default”创建测试数据库。。。系统检查未发现任何问题（0静音）。E……....==============================================================================================================================================================================================================================================================================================================================================================================错误：test_pass_question（polls.tests.QuestionDetailViewTests）-------------------------------------------------------------回溯（最近一次调用）：文件“/home/sugumar/python/django/mysite/polls/tests.py”，第73行，在test_pass_question self.assertquerystequal（response.context['question']，''）文件中“/home/sugumar/.local/share/virtualenvs/mysite VWHaFuat/lib/python3.5/site packages/django/test/testcases.py”，第946行，在AssertQuerystequal items=map（transform，qs）TypeError中：“问题”对象不可编辑

---------------------------------------------------------------------- 在0.069s中运行了10个测试

正在销毁别名默认值的测试数据库...

在命令行中：

>>> from django.test.utils import setup_test_environment
>>> setup_test_environment()
>>> from django.test import Client
>>> client = Client()
>>> from django.urls import reverse
>>> response = client.get(reverse('polls:detail',args=(1,)))
>>> response.context
[{'True': True, 'False': False, 'None': None}, {'messages': <django.contrib.messages.storage.fallback.FallbackStorage object at 0xb74425ec>, 'perms': <django.contrib.auth.context_processors.PermWrapper object at 0xb69feecc>, 'user': <SimpleLazyObject: <function AuthenticationMiddleware.process_request.<locals>.<lambda> at 0xb7440bfc>>, 'csrf_token': <SimpleLazyObject: 'FrAJ52rWG57SSbSE9y4V2tammjvQqjBUyl2tK6aEzj8ZfENSyFl7Fy05bnQh3XyQ'>, 'request': <WSGIRequest: GET '/polls/1/'>, 'DEFAULT_MESSAGE_LEVELS': {'DEBUG': 10, 'INFO': 20, 'SUCCESS': 25, 'WARNING': 30, 'ERROR': 40}}, {}, {'object': <Question: What's Up?>, 'question': <Question: What's Up?>, 'view': <polls.views.DetailView object at 0xb6a2fd4c>}]
>>> response.context['question']
<Question: What's Up?>
>>> exit

在命令里看到了吗？我试过了

 self.assertQuerysetEqual(response.context['question'],'<Question: past question>')

Answer 1

通常，如果变量名是单数（'问题是单数），这意味着这可能不是QuerySet（或多或少是一个集合），而是一个单一的问题对象。

此外，对象（如问题对象）和它的文本表示（如'）之间存在差异

因此，您应该检查与过去的问题是否相等，如：

def test_past_question(self):
    past_question = create_question(question_text='past question',days=-30)
    response = self.client.get(reverse('polls:detail',args=(past_question.id,)))    
    self.assertEqual(response.context['question'], past_question)