Django：如果输入其他字段，则使字段为必填

Question

如果用户在video_url字段中输入一个值，我试图使该字段成为video_thumbnail ，反之亦然。 但是，如果两者都为空，则不需要。

models.py

class Post(TimeStampedModel):
    video_url = models.CharField(max_length=255, blank=True)
    video_thumbnail = ResizedImageField(upload_to=file_name, storage=upload_storage, max_length=255, blank=True, null=True)

Answer 1

您可以覆盖保存方法，

class Post(TimeStampedModel):
    video_url = models.CharField(max_length=255, blank=True)
    video_thumbnail = ResizedImageField(upload_to=file_name, storage=upload_storage, max_length=255, blank=True, null=True)

    def save(self, *args, **kwargs):
       if not self.video_url and self.video_thumbnail == None:
          raise ValueError("The value isn't allowed")
       super(Post, self).save(*args, **kwargs)