在不访问数据库的情况下从模型类切换到代理类：
class EntryProxy(Entry):
@property
def category(self):
new_inst = EntryProxy()
new_inst.__dict__ = super(EntryProxy, self).category.__dict__
return new_inst
编辑：上面的代码片段似乎不适用于django 1.4。
从Django 1.4开始，我像这样手动获取所有值字段：
class EntryProxy(Entry):
@property
def category(self):
category = super(EntryProxy, self).category
new_inst = EntryProxy()
for attr in [f.attname for f in category.__class__._Meta.fields] + ['_state']:
setattr(new_inst, attr, getattr(category, attr))
return new_inst
class CategoryProxy(Category):
@property
def entry_set(self):
qs = super(CategoryProxy, self).entry_set
qs.model = EntryProxy
return qs
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