有没有办法在DRF中获取所有ManyToMany相关对象

Question

I have Tags in my application and it's possible to Tag different things like News, Events... News and Events have a ManyToMany relation to Tags. Is it possible to get every object where the Tag is used?

My Models (shortened) look like this:

Tag Model

class Tag(models.Model):
    title = models.CharField(max_length=35)

News Model

class News(models.Model):
    title = models.CharField(max_length=75)
    tag = models.ManyToManyField(Tag, related_name="news")

Event Model

class Event(models.Model):
    title = models.CharField(max_length=75)
    tag = models.ManyToManyField(Tag, related_name="event")

I know that I can get all News that have the Tags assigned by

tag = self.get_object()
tag.news.all()

But is it possible to get all News, Events... without 10 requests? I'm looking for something like tag.all.all()

Answer 1

try this

tag.news.all() | tag.event.all()

"news" and "event" are accessible due to reverse relationship here which are defined in their respective model fields with the keyword "related_name".

note that this may give duplicate tags as it is a union between the two. for distinct tags,

(tag.news.all() | tag.event.all()).distinct()