如果我创建MyFile的对象，文档对象将被自动创建

Question

如何创建这样的事情：

如果我创建MyFile对象，Document对象将被自动创建（rootfile应该ForeignKey到MyFile）

class MyFile(models.Model): 
    user = models.ForeignKey(User) 
    path = models.FileField(upload_to="files") 

class Document(models.Model): 
    rootfile = models.ForeignKey(MyFile) 
    user = models.ForeignKey(User,related_name='doc_owner') 
    title = models.CharField(max_length=255) 
    description = models.TextField() 
    content = models.TextField() 

Answer 1

使用post_save()信号MyFile如果它的新的，也创建Document对象。

@receiver(post_save, sender=MyFile) 
def my_handler(sender, **kwargs): 
    if kwargs['created']: 
     #create document object appropriately. 
     document = Document() 
     document.rootfile = kwargs['instance'] 
     document.save()