擅长:python、mysql、java
<p>您可以创建一个<code>PortManager</code>类并重写<code>get_queryset</code>方法并在模型中引用它:</p>
<pre><code>class PortManager(models.Manager):
def get_queryset(self):
return super(PortManager, self).get_queryset().select_related()
class Port(models.Model):
city = models.ForeignKey(City)
objects = PortManager()
def __str__(self):
return self.city.country.title
</code></pre>