如果在保存相关对象模型时字段为空，我们如何访问外部模型的对象值并将其保存为默认值？

Question

class ObjectSEO(models.Model):
    object= models.ForeignKey(Objects, related_name='seo', on_delete=models.CASCADE)
    meta_description = models.CharField(max_length=170, help_text="Please add product meta description, max length 170 characters", default="Some Texts" )
    meta_keywords = models.CharField(max_length=250, help_text="Please add product keywords separated with comma", default="Some Texts" )
    meta_name = models.CharField(max_length=70, help_text="object title"  default = Objects.name)

在这里，我有两个模型，Objects 和 ObjectSEO。

在 ObjectSEO 模型 > site_name 列> 我想添加外键对象名称作为默认值。

我该怎么做？我的方法是 Pythonic 的吗？

Answer 1

您可以覆盖 ObjectSEO 模型的 save() 方法，为模型的字段本身设置默认值。

class ObjectSEO(model.Model):
    object= models.ForeignKey(Objects, related_name='seo', on_delete=models.CASCADE)
    meta_description = models.CharField(max_length=170, help_text="Please add product meta description, max length 170 characters", default="Some Texts" )
    meta_keywords = models.CharField(max_length=250, help_text="Please add product keywords separated with comma", default="Some Texts" )
    meta_name = models.CharField(max_length=70, help_text="object title"  default = Objects.name)

    def save(self, *args, **kwargs):
        if self.object.name is not None:
            self.meta_name = self.object.name

        super(ObjectSEO, self).save(*args, **kwargs)

如果在保存相关对象模型时字段为空，我们如何访问外部模型的对象值并将其保存为默认值？

How we can access and save object value of foregn model as default value, if the field is empty while saving the related object model?

django

django-models