Django has a unique_for_date property you can set when adding a SlugField to your model. This causes the slug to be unique only for the Date of the field you specify:

Django有一个unique_for_date属性,您可以在向模型添加SlugField时设置该属性。这会导致slug仅对您指定的字段的Date具有唯一性:

class Example(models.Model):
    title = models.CharField()
    slug = models.SlugField(unique_for_date='publish')
    publish = models.DateTimeField()

What would be the best way to achieve the same kind of functionality for a non-DateTime field like a ForeignKey? Ideally, I want to do something like this:

对于像ForeignKey这样的非DateTime字段,实现相同功能的最佳方法是什么?理想情况下,我想做这样的事情:

class Example(models.Model):
    title = models.CharField()
    slug = models.SlugField(unique_for='category')
    category = models.ForeignKey(Category)

This way I could create the following urls:

这样我就可以创建以下URL:

/example/category-one/slug
/example/category-two/slug
/example/category-two/slug <--Rejected as duplicate

My ideas so far:

我的想法到目前为止:

• Add a unique index for the slug and categoryid to the table. This requires code outside of Django. And would the built-in admin handle this correctly when the insert/update fails?

  将slug和categoryid的唯一索引添加到表中。这需要Django之外的代码。当插入/更新失败时,内置管理员会正确处理吗?

• Override the save for the model and add my own validation, throwing an error if a duplicate exists. I know this will work but it doesn't seem very DRY.

  覆盖模型的保存并添加我自己的验证,如果存在重复则抛出错误。我知道这会起作用,但看起来不是很干。

• Create a new slug field inheriting from the base and add the unique_for functionality there. This seems like the best way but I looked through the core's unique_for_date code and it didn't seem very intuitive to extend it.

  创建一个继承自base的新slug字段,并在那里添加unique_for功能。这似乎是最好的方法,但我查看了核心的unique_for_date代码,并且扩展它似乎不太直观。

Any ideas, suggestions or opinions on the best way to do this?

有关最佳方法的任何想法,建议或意见?

1 个解决方案

class Example(models.Model):
    title = models.CharField()
    slug = models.SlugField(db_index=False)
    category = models.ForeignKey(Category)

    class Meta:
        unique_together = (('slug','category'),)
        # or also working since Django 1.0:
        # unique_together = ('slug','category',)