[storm] RuntimeError with Storm(twisted integration)

[Daniel Yang]

Hi team,

I am doing some experiments on  Storm(twisted integration) and Nevow to see
how they can work together.

I went across a RuntimeError when I kept refreshing a page. It said:
------------------------------------------------log--------------------------------------------------------------
2009-07-17 14:58:42+0800 [-] [Failure instance: Traceback: <type
'exceptions.RuntimeError'>: Resolving lazy values with the Twisted wrapper
is not possible right now! Please refetch your object using
store.get/store.find
--- <exception caught here> ---
/Library/Python/2.5/site-packages/Twisted-8.2.0_r27097-py2.5-macosx-10.5-i386.egg/twisted/internet/defer.py:323:_runCallbacks
/Users/Daniel/Documents/workspace/NovaWeb/src/web/FromLocation.py:47:cb_all
/Library/Python/2.5/site-packages/storm-0.14-py2.5-macosx-10.5-i386.egg/storm/properties.py:60:__get__
/Library/Python/2.5/site-packages/storm-0.14-py2.5-macosx-10.5-i386.egg/storm/variables.py:178:get
/Library/Python/2.5/site-packages/storm-0.14-py2.5-macosx-10.5-i386.egg/storm/event.py:53:emit
/Library/Python/2.5/site-packages/storm-0.14-py2.5-macosx-10.5-i386.egg/storm/twisted/store.py:238:_resolve_lazy_value
]
------------------------------------------------log--------------------------------------------------------------

(latest storm and Nevow, Twisted.Python 2.5.1, Osx 10.5.7)

I am using StorePool to manage connections:
------------------------------------------------code--------------------------------------------------------------

from storm.databases.sqlite import SQLite

from storm.uri import URI

from storm.twisted.store import StorePool


database = SQLite(URI(*'sqlite:///test.db'*))

pool = StorePool(database, 5, 10)

pool.start()
------------------------------------------------code--------------------------------------------------------------



On this page, I have 2 renders to access database(sqlite) with storm(People
list and Shop list):

------------------------------------------------code--------------------------------------------------------------

def *render_PeopleList*(*self*, ctx, data):

pat = inevow.IQ(ctx).patternGenerator(*'PeopleItem'*)


 def *cb_find*(results, s):

results.config(offset=0, limit=10)

return results.all().addCallback(cb_all, s)

 def *cb_all*(items, s):

#recycle the store.

pool.put(s)

ps = []

for item in items:

p = pat()

p.fillSlots(*'nickname'*, item.nickname)

ps.append(p)

 return ctx.tag[ ps ]

 def *cb_get*(s):

return s.find(People).addBoth(cb_find, s)

 return pool.get().addCallback(cb_get).addErrback(lambda error:
log.msg(error))
------------------------------------------------code--------------------------------------------------------------

and shop render is pretty much like this.


In file "storm/twisted/store.py:238", I notice the _resolve_lazy_value
function does nothing but raising an error.

Do anyone have any idea of what is the problem?

Thanks.


-- 
-----------------------------------------------
Yours
Faithfully

Daniel Yang
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