django.db.utils.IntegrityError：表“Event_event”中主键为“1”的行具有无效的外键：

Question

我的事件 Model

class Event(models.Model):
    name = models.CharField(max_length=100)
    start_date = models.DateField()
    end_date = models.DateField()
    TIMEZONES = tuple(zip(pytz.all_timezones, pytz.all_timezones))
    timezone = models.CharField(max_length=32, choices=TIMEZONES)
    session=models.ForeignKey(Session,on_delete=models.CASCADE)
    slug = models.SlugField(unique=True, editable=False, max_length=100)

和我的 session model

class Session(models.Model):
    name=models.CharField(max_length=100)
    start_date=models.DateField()
    end_date=models.DateField()
    speaker=models.CharField(max_length=100)
    slug = models.SlugField(unique=True, editable=False, max_length=100)

创建测试时出现错误。 session部分应该怎么做？ 这是我的测试代码

class CreateTest(APITestCase):
    def test_create_event(self):
        url = 'http://127.0.0.1:8000/api/event/create'
        data = Event.objects.create(
            name="deneme 5",
            start_date="2020-05-23",
            end_date="2020-05-26",
            timezone="Etc/GMT",
            session_id='1'
            )
        response = self.client.post(url,data)
        self.assertEqual(response.status_code, status.HTTP_201_CREATED)

Answer 1

You get this error because, you haven't any Session record which has id 1. You must create Session object before create Event object and provide this created session id to event object. 在 Django APITestCase中，始终为所有测试函数创建新的空数据库。