Question

我有2个模型，相册和图片以及功能album_reorder，它接收图片ID列表并相应地改变权重。这工作正常，但我正在尝试为函数编写测试，例如：

Class ReposTests(unittest.TestCase):
    def test_album_reorder__fail__not_owned(self):

        # Create a test user, album and pictures.
        user = self.create_test_user()
        # create_default_album() generates an Album along with 6 default Picture records.    
        create_default_album(user)
        album = get_first_album(user.profile)
        pictures = Picture.objects.filter(album=album)

        # Get all picture IDs into a list and record each pictures existing weight.
        picture_ids = []
        picture_weights = {}
        for picture in pictures:
            picture_ids.append(picture.id)
            print "%s:%s:%s" % (album.id, picture.id, picture.weight)
            picture_weights[picture.id] = picture.weight

        # Create another test user, album and pictures.
        user2 = self.create_test_user()
        create_default_album(user2)
        album2 = get_first_album(user2.profile)
        pictures2 = Picture.objects.filter(album=album2)

        # Add a Picture ID from a different user to test the restriction that an album cannot be re-ordered if any pictures do not belong to the specified user.
        picture_ids.append(pictures2[0].id)
        print "%s:%s:%s" % (album2.id, pictures2[0].id, pictures2[0].weight)
        picture_weights[pictures[2].id] = pictures2[0].weight

        # Shuffle all picture IDs
        random = Random()
        while pictures[0].id == picture_ids[0]:
            random.shuffle(picture_ids)

        # Reorder picture IDs according to shuffled ID list, however this should fail due to the ownership check.
        album_reorder(user, picture_ids)
        print picture_ids
        print picture_weights

        # Check each
        for picture_id in picture_ids:
            self.assertEqual(picture_weights[picture_id], Picture.objects.get(id=picture_id).weight)

现在问题似乎与构造picture_weights dict的方式有关。由于以下两行输出：

# Loop output: (album.id, picture.id, picture.weight)
# 1346:5699:0
# 1346:5700:1
# 1346:5701:2
# 1346:5702:3
# 1346:5703:4
# 1346:5704:5
# 1347:5705:0

print picture_ids
# Outputs: [5700L, 5703L, 5702L, 5699L, 5704L, 5705L, 5701L]

print picture_weights
# Outputs: {5699L: 0L, 5700L: 1L, 5701L: 0L, 5702L: 3L, 5703L: 4L, 5704L: 5L}

请注意，picture_ids长度为7个元素，正如预期的那样，picture_weights只有6个元素，并且权重与循环的输出不匹配。 5705中缺少第二个用户图片picture_weights，但picture_weights中的一个已被分配了0L的错误权重。

我根本没有dict的经验，我只是试图运用我对PHP关联数组的知识，所以我假设我的知识存在差距。谢谢你的建议！

Answer 1

这些行中的列表和字典分歧：

    # Add a Picture ID from a different user to test the restriction that an album cannot be re-ordered if any pictures do not belong to the specified user.
    picture_ids.append(pictures2[0].id)
    print "%s:%s:%s" % (album2.id, pictures2[0].id, pictures2[0].weight)
    picture_weights[pictures[2].id] = pictures2[0].weight

注意你是如何使用pictures[2].id的，5701L（这也就是字典中特定键重量变化的原因）。你可能意味着该行：

    picture_weights[pictures2[0].id] = pictures2[0].weight

奇怪的字典分配问题

1 个答案: