ValueError: The 'image' attribute has no file associated with it. when testing a model with a NULLABLE image field

Question

我正在测试一个名为 Category 的 model，它看起来像这样：

class Category(models.Model):
    image = models.ImageField(upload_to='images', null=True, blank=True)
    title = models.CharField(max_length=200, unique=True, blank=False, null=False)

如您所见，image 字段是 nullable 但是当我尝试在我的 TestCase 中创建一个 Category 实例时，我得到了以下错误：

raise ValueError("The '%s' attribute has no file associated with it." % self.field.name)
ValueError: The 'image' attribute has no file associated with it.

这是测试：

def setUp(self):
    self.category = Category.objects.create(title='test_category')

我已经试过这样创建它了：

Category.objects.create(title='test_category', image=Null)

但是没有用。

Answer 1

你可以这样做，这应该有效

class Category(models.Model):
    image = models.ImageField(upload_to='images/', null=True, blank=True)
    title = models.CharField(max_length=200, unique=True, blank=False, null=False)



def setUp(self):
    self.category = Category(title='test_category')
    self.category.save()

Answer 2

原来这是一个模板错误，因为我没有处理类别没有图像的可能性，当我运行在 CategoryListView 它返回错误，因为 test 类别没有 image.

ValueError: The 'image' attribute has no file associated with it. when testing a model with a NULLABLE image field

ValueError: The 'image' attribute has no file associated with it. when testing a model with a NULLABLE image field

python

django

django-models

django-testing