Django models.Manager 无法访问模型

Question

我有以下测试失败，因为它只在数据库中插入一行，它应该插入 100 行

class QuestionsTest(TestCase):
    def setUp(self):
        self.fake = Faker()

    def test_populating_table_with_random_data(self):
        newQuestion = Questions()
        x = 0
        while x < 100:
            newQuestion.category = self.fake.text(max_nb_chars=254)
            newQuestion.difficulty = self.fake.text(max_nb_chars=8)
            newQuestion.question_type = self.fake.text(max_nb_chars=20)
            newQuestion.text = self.fake.text(max_nb_chars=254)
            newQuestion.save()
            x += 1
        #100 rows should be inserted
        self.assertEqual(Questions.objects.count(), (100))


"""Traceback (most recent call last):
  File 'Database/tests.py', line 99, in test_populating_table_with_random_data
    self.assertEqual(Questions.objects.count(), (100))
AssertionError: 1 != 100 """

在收到此错误之前，我收到错误“类问题没有对象成员”。我通过明确声明解决了这个问题

objects = models.Manager()

在我的 Questions 模型中，但我认为 django 会自动生成一个名为 objects 的管理器

Answer 1

您每次都保存相同 Questions 对象，因此在第一次创建它之后，您更新 现有对象。最后，只有一个。

您可以在循环中创建一个新对象：

class QuestionsTest(TestCase):
    def setUp(self):
        self.fake = Faker()

    def test_populating_table_with_random_data(self):
        x = 0
        while x < 100:
            newQuestion = Questions()
            newQuestion.category = self.fake.text(max_nb_chars=254)
            newQuestion.difficulty = self.fake.text(max_nb_chars=8)
            newQuestion.question_type = self.fake.text(max_nb_chars=20)
            newQuestion.text = self.fake.text(max_nb_chars=254)
            newQuestion.save()
            x += 1
        #100 rows should be inserted
        self.assertEqual(100, Questions.objects.count())

使用for 循环可能会更好：

class QuestionsTest(TestCase):
    def setUp(self):
        self.fake = Faker()

    def test_populating_table_with_random_data(self):
        for __ in range(100):
            newQuestion = Questions()
            newQuestion.category = self.fake.text(max_nb_chars=254)
            newQuestion.difficulty = self.fake.text(max_nb_chars=8)
            newQuestion.question_type = self.fake.text(max_nb_chars=20)
            newQuestion.text = self.fake.text(max_nb_chars=254)
            newQuestion.save()
        #100 rows should be inserted
        self.assertEqual(100, Questions.objects.count())

你也可以用.objects.create(…)创建对象：

class QuestionsTest(TestCase):
    def setUp(self):
        self.fake = Faker()

    def test_populating_table_with_random_data(self):
        for __ in range(100):
            newQuestion = Questions.objects.create(
                category = self.fake.text(max_nb_chars=254),
                difficulty = self.fake.text(max_nb_chars=8),
                question_type = self.fake.text(max_nb_chars=20),
                text = self.fake.text(max_nb_chars=254)
            )
        #100 rows should be inserted
        self.assertEqual(100, Questions.objects.count())