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在使用Flask-Admin创建的列表视图中，我添加了两列sqlalchemy对象，这些列实际上是在我的对象类中使用混合属性进行计算的。Flask-Admin：可以搜索hybrid_property吗？
class MyClass(db.Model):
@hybrid_property
def state(self):
now = datetime.datetime.now()
state = 'OK'
for panne in self.pannes:
if panne.f_indispo < now:
continue
if panne.d_indispo <= now and panne.f_indispo >= now:
state = 'KO'
break
if panne.d_indispo > now:
state = 'PR'
return state
@hybrid_property
def station_name(self):
if app.config['STATIONS'] is not None and self.id_station in app.config['STATIONS']:
return app.config['STATIONS'][self.id_station]
return unicode(self.id_station)
所以，我将它们添加列表视图：
class MyClassView(ModelView):
list_template = 'some/template.html'
column_list = ('column1','column2','state','station_name')
column_searchable_list = ('column1','column2')
column_formatters = dict(state=macro('macro_in_my_template'))
[...]
而且一切都只是一个事实，即我的两个“混合列”不可搜索，也不排序确定。 如果我在column_searchable_list添加它们，我得到：
'状态' 属性：
File "/usr/lib/python2.6/site-packages/Flask_Admin-1.0.8-py2.6.egg/flask_admin/contrib/sqla/view.py", line 271, in __init__
super(ModelView, self).__init__(model, name, category, endpoint, url)
File "/usr/lib/python2.6/site-packages/Flask_Admin-1.0.8-py2.6.egg/flask_admin/model/base.py", line 515, in __init__
self._refresh_cache()
File "/usr/lib/python2.6/site-packages/Flask_Admin-1.0.8-py2.6.egg/flask_admin/model/base.py", line 540, in _refresh_cache
self._search_supported = self.init_search()
File "/usr/lib/python2.6/site-packages/Flask_Admin-1.0.8-py2.6.egg/flask_admin/contrib/sqla/view.py", line 410, in init_search
for column in self._get_columns_for_field(p):
File "/usr/lib/python2.6/site-packages/Flask_Admin-1.0.8-py2.6.egg/flask_admin/contrib/sqla/view.py", line 379, in _get_columns_for_field
attr = getattr(self.model, field, None)
File "/usr/lib/python2.6/site-packages/SQLAlchemy-0.9.6-py2.6-linux-x86_64.egg/sqlalchemy/ext/hybrid.py", line 738, in __get__
return self.expr(owner)
File "/var/www/***/app/***.py", line 90, in state
for panne in self.pannes:
File "/usr/lib/python2.6/site-packages/SQLAlchemy-0.9.6-py2.6-linux-x86_64.egg/sqlalchemy/sql/operators.py", line 338, in __getitem__
return self.operate(getitem, index)
File "/usr/lib/python2.6/site-packages/SQLAlchemy-0.9.6-py2.6-linux-x86_64.egg/sqlalchemy/orm/attributes.py", line 171, in operate
return op(self.comparator, *other, **kwargs)
File "/usr/lib/python2.6/site-packages/SQLAlchemy-0.9.6-py2.6-linux-x86_64.egg/sqlalchemy/sql/operators.py", line 338, in __getitem__
return self.operate(getitem, index)
File "/usr/lib/python2.6/site-packages/SQLAlchemy-0.9.6-py2.6-linux-x86_64.egg/sqlalchemy/sql/operators.py", line 183, in operate
raise NotImplementedError(str(op))
NotImplementedError:
'站的班次' 属性：
File "/usr/lib/python2.6/site-packages/Flask_Admin-1.0.8-py2.6.egg/flask_admin/contrib/sqla/view.py", line 271, in __init__
super(ModelView, self).__init__(model, name, category, endpoint, url)
File "/usr/lib/python2.6/site-packages/Flask_Admin-1.0.8-py2.6.egg/flask_admin/model/base.py", line 515, in __init__
self._refresh_cache()
File "/usr/lib/python2.6/site-packages/Flask_Admin-1.0.8-py2.6.egg/flask_admin/model/base.py", line 540, in _refresh_cache
self._search_supported = self.init_search()
File "/usr/lib/python2.6/site-packages/Flask_Admin-1.0.8-py2.6.egg/flask_admin/contrib/sqla/view.py", line 410, in init_search
for column in self._get_columns_for_field(p):
File "/usr/lib/python2.6/site-packages/Flask_Admin-1.0.8-py2.6.egg/flask_admin/contrib/sqla/view.py", line 390, in _get_columns_for_field
raise Exception('Invalid field %s: does not contains any columns.' % field)
Exception: Invalid field station_name: does not contains any columns.
的问题是： 是否有可能使用hybrid_property在这种情况下还是应该尝试一种不同的解决方案？ 如果可能的话，我现在不知道如何解决这些错误。