django queryset for many-to-many field

Question

我有以下Django 1.2模型:

class Category(models.Model):
    name = models.CharField(max_length=255)

class Article(models.Model):
    title = models.CharField(max_length=10, unique=True)
    categories = models.ManyToManyField(Category)

class Preference(models.Model):
    title = models.CharField(max_length=10, unique=True)
    categories = models.ManyToManyField(Category)

如何执行一个查询,该查询将为我提供与给定Preference对象相关的任何相同类别相关联的所有Article对象？

例如,如果我有一个与"鱼","猫"和"狗"类别相关的偏好对象,我想要一个与"鱼","猫"或"狗"相关的所有文章的列表.

Answer 1

尝试:

preference = Preference.objects.get(**conditions)
Article.objects.filter(categories__in = preference.categories.all())