Question

我有三个我想查询的课程。我想让数据库完成工作。是否可以在User对象上运行单个查询以获取匹配的所有相关字段？我试图避免加入我的代码中的三个表。如果我在代码中执行此操作，我将查询所有三个类，然后在保留匹配项的同时消除重复项。

Query: Get all users whose name contains "William", category is "Single" and alias is "Bill". 

class ModelA(models.Model):
    user = models.ForeignKey(User,related_name="%(class)s",null=False)
    name = models.CharField(max_length=70)

    def __unicode__(self):
        return u'%s' % (self.name)

class ModelB(models.Model):
    user = models.ForeignKey(User,related_name="%(class)s",null=False)
    category = models.CharField(max_length=70)

    def __unicode__(self):
        return u'%s' % (self.category)

class ModelC(models.Model):
    user = models.ForeignKey(User,related_name="%(class)s",null=False)
    alias = models.CharField(max_length=70)

    def __unicode__(self):
        return u'%s' % (self.alias)

Note: this is an example only, and I am not looking to combine all the info in a single table.

Answer 1

如果不加入这三个表，就无法做到这一点。

User.objects.filter(modela__name=u'William', modelb__category=u'Single',
  modelc__alias=u'Bill')

加入Django中共享相同ForeignKey的表

1 个答案: