Hi,
as I understand the documentation, sub-sub-classing
InheritableSQLObject should be fine. But it messes with introspection,
as demonstrated by the short attached script.
When there is no C and you create and retrieve B, everything works.
Introduce C, and running it with an empty database (rm /tmp/x) still
works:
<class '__main__.A'>
<class '__main__.B'>
X
<class '__main__.C'>
X
But run it again, so that the first list() actually does retrieve
something, and it will raise:
<class '__main__.A'>
<class '__main__.B'>
X
<class '__main__.C'>
Traceback (most recent call last):
File "desperate.py", line 23, in <module>
list(B.select())
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/
lib/python2.6/site-packages/SQLObject-0.12dev_r3970-py2.6.egg/
sqlobject/sresults.py", line 179, in __iter__
return iter(list(self.lazyIter()))
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/
lib/python2.6/site-packages/SQLObject-0.12dev_r3970-py2.6.egg/
sqlobject/inheritance/iteration.py", line 43, in next
childResults=childResults, connection=self.dbconn)
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/
lib/python2.6/site-packages/SQLObject-0.12dev_r3970-py2.6.egg/
sqlobject/inheritance/__init__.py", line 309, in get
selectResults=childResults)
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/
lib/python2.6/site-packages/SQLObject-0.12dev_r3970-py2.6.egg/
sqlobject/inheritance/__init__.py", line 309, in get
selectResults=childResults)
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/
lib/python2.6/site-packages/SQLObject-0.12dev_r3970-py2.6.egg/
sqlobject/inheritance/__init__.py", line 290, in get
val = super(InheritableSQLObject, cls).get(id, connection,
selectResults)
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.6/
lib/python2.6/site-packages/SQLObject-0.12dev_r3970-py2.6.egg/
sqlobject/main.py", line 893, in get
val._init(id, connection, selectResults)
File "/Users/towb/Desktop/desperate.py", line 10, in _init
print getattr(self, 'name')
File "<string>", line 1, in <lambda>
AttributeError: 'NoneType' object has no attribute 'name'
I couldn't find out what actually happens as the code is full of
eval()...import sqlobject
from sqlobject.inheritance import InheritableSQLObject
class A(InheritableSQLObject):
def _init(self, *args, **kargs):
InheritableSQLObject._init(self, *args, **kargs)
print self.__class__
if 'name' in dir(self):
# This should never fail
print getattr(self, 'name')
class B(A):
name = sqlobject.StringCol()
class C(B):
pass
sqlobject.sqlhub.processConnection = sqlobject.connectionForURI('sqlite:/tmp/x')
for klass in (A, B, C):
klass.createTable(ifNotExists = True)
list(B.select())
C(name = 'X')
list(B.select())
------------------------------------------------------------------------------
Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day
trial. Simplify your report design, integration and deployment - and focus on
what you do best, core application coding. Discover what's new with
Crystal Reports now. http://p.sf.net/sfu/bobj-july
_______________________________________________
sqlobject-discuss mailing list
sqlobject-discuss@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/sqlobject-discuss
