Hi,
I have trouble getting SimpleJoin to work. I currently use SQLObject 0.9.0.
This is an excerpt from my model:
class User(SQLObject):
class sqlmeta:
table = "usr_User"
idName = "usr_Id"
display_name = UnicodeCol(length=255, dbName="usr_DisplayName")
[...]
end_user = SingleJoin("EndUser", joinColumn="eus_usr_Id")
class EndUser(SQLObject):
class sqlmeta:
table = "eus_EndUser"
idName = "eus_Id"
user = ForeignKey("User", dbName="eus_usr_Id")
[...]
Issuing the following code:
>>> u = User.get(8)
>>> e = u.end_user
Gives:
Traceback (most recent call last):
File "<console>", line 1, in ?
File "<string>", line 1, in <lambda>
File
"C:\Python24\lib\site-packages\sqlobject-0.9.0-py2.4.egg\sqlobject\joins.py",
line 312, in performJoin
results = self.otherClass.select(
File
"c:\python24\lib\site-packages\SQLObject-0.9.0-py2.4.egg\sqlobject\sqlbuilder.py",
line 381, in __getattr__
raise AttributeError("%s instance has no attribute '%s'" %
(self.soClass.__name__, attr))
AttributeError: EndUser instance has no attribute 'eusUsrId'
If I change the definition of the foreign key in EndUser to use
MultipleJoin, like this, it all seems to work allright:
end_user = MultipleJoin("EndUser", joinColumn="eus_usr_Id")
Now I can do this:
>>> u = User.get(8)
>>> e = u.end_user[0]
The value of e is now what I expect.
Some investigation of the code in SQLObject revealed that the
implementations of the method performJoin inside SOSingleJoin and
SOMultipleJoin use quite different approaches.
I tried modifying performJoin in the SOSingleJoin class to do something
similar to the one in SOMultipleJoin, resulting in this code:
def performJoin(self, inst):
ids = inst._connection._SO_selectJoin(
self.otherClass,
self.joinColumn,
inst.id)
if inst.sqlmeta._perConnection:
conn = inst._connection
else:
conn = None
if len(ids) == 0:
return None
result = self.otherClass.get(ids[0][0], conn)
return result
Now things work like I would expekt. Have I misunderstood the concept of
how SimpleJoin columns works, or is the implementation outdated?
Tom
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