In a list view created with Flask-Admin, I have added two columns of an sqlalchemy object which are in fact computed in my object class using hybrid properties.
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)
So, I add them in the list view :
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'))
[...]
And everything is ok except the fact that my two "hybrid columns" aren't searchable nor sortable. If I add them in column_searchable_list, I get :
'state' property :
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:
'station_name' property :
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.
The question is : Is it possible to use hybrid_property in this case or should I try a different solution ? If it's possible, I don't know for the moment how to solve these errors.
