擅长:python、mysql、java
<p>这个怎么样?在</p>
<pre><code>class Car(object):
def __init__(self, _id, color, steering_wheel_ref_id, session):
self._id = _id
self.color = color
self.steering_wheel_ref_id = steering_wheel_ref_id
self.session = session
self._steering_wheel = None
@property
def steering_wheel(self):
if self._steering_wheel is None:
# Get the referecend object from the session
self._steering_wheel = self.session.resolve_item_refs(self.steering_wheel_ref_id)
return self._steering_wheel
</code></pre>