Python _Camelot出现外键错误

我在Ubuntu11.04 repos中尝试了Camelot 10.07.02-c2-4build1和SQLAlchemy 0.6.4-3，当我尝试在表视图中引用外键时，我得到了以下stacktrace：

ERROR:camelot.view.model_thread.signal_slot_model_thread:exception caught in model thread while executing get_columns -> QueryTableProxy.setColumns
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/camelot/view/model_thread/signal_slot_model_thread.py", line 31, in execute
    result = self._request()
  File "/usr/lib/python2.7/dist-packages/camelot/view/proxy/collection_proxy.py", line 272, in get_columns
    self._columns = columns_getter()
  File "/usr/lib/python2.7/dist-packages/camelot/view/model_thread/__init__.py", line 56, in wrapper
    return original_function( *args, **kwargs )
  File "/usr/lib/python2.7/dist-packages/camelot/admin/object_admin.py", line 418, in get_columns
    for field in self.list_display]
  File "/usr/lib/python2.7/dist-packages/camelot/view/model_thread/__init__.py", line 56, in wrapper
    return original_function( *args, **kwargs )
  File "/usr/lib/python2.7/dist-packages/camelot/view/elixir_admin.py", line 198, in get_field_attributes
    foreign_keys = list(property._foreign_keys)
AttributeError: 'RelationshipProperty' object has no attribute '_foreign_keys'

我的代码在以下方面至关重要：

class Customer(Entity):
    name = Field(Unicode(200))
    packages = OneToMany("Package")

    class Admin(EntityAdmin):
        list_display = ['name']

class Package(Entity):
    interval_months = Field(Integer)
    customer = ManyToOne("Customer")

    class Admin(EntityAdmin):    
        list_display = ['interval_months', 'customers'] # here is the error

---

搜索给了我一些提示，但我真的不明白如何解决这个问题。

SQLAlchemy的版本已经更改了Camelot使用的API，因此Camelot需要更新