Django 作者的出版商名单

这是可行的，但是有没有一个Django成语可以做得更好呢

my_books = Book.objects.filter(author__name=='me')
my_publishers = Publisher.objects.filter(pk__in=[b.publisher.id for b in my_books])

models = round_up_the_usual_suspects()

class Publisher(models.Model):
    name = models.CharField(max_length=30)


class Author(models.Model):
    name = models.CharField(max_length=30)


class Book(models.Model):
    title = models.CharField(max_length=100)
    author = models.ForeignKey(Author, related_name='books_authored')
    publisher = models.ForeignKey(Publisher, related_name='books_published')

你能行

my_publishers = Publisher.objects.filter(book__author__name='me')

---

这将为您提供由

me

撰写的书籍的所有出版商，通常您会从您想要结束的关系开始。所以@karthikrs的建议最有意义。