Question

我有以下两种模型：

class Tutorial(models.Model):
    name = models.CharField(max_length=200, unique=True, blank=False, null=False)
    cover = models.ImageField(upload_to=tutorial_image_path)
    author = models.ForeignKey(User, on_delete=models.CASCADE)
    created_on = models.DateTimeField(auto_now_add=True)
    status = models.IntegerField(choices=STATUS, default=1)

class Video(models.Model):
    name = models.CharField(max_length=200, unique=True, blank=False, null=False)
    tutorial = models.ForeignKey(Tutorial, on_delete=models.DO_NOTHING, blank=False, null=False)
    category = models.ForeignKey(Category, on_delete=models.DO_NOTHING, blank=False, null=False)
    iframe = models.CharField(max_length=500, blank=False, null=False)
    description = models.TextField(blank=True, null=True)
    created_on = models.DateTimeField(auto_now_add=True)
    status = models.IntegerField(choices=STATUS, default=1)

class Meta:
    ordering = ['-created_on']

def __str__(self):
    return self.name

我想在Tutorials模型中至少有一个视频的情况下获取所有Video

以下内容：

results = Tutorial.objects.filter(id__in=Video.objects.filter....)

有什么想法吗？

Answer 1

您可以使用isnull

results = Tutorial.objects.filter(video__isnull=False).distinct()

也许（因为我没有测试过），您也可以这样做：

results = Tutorial.objects.select_related("video").filter(video__isnull=False).distinct()

仅在具有外键的子项具有记录的情况下获取模型的结果

1 个答案: