I think I figured this out. The it seems to matter what class has the
foreign key so special attention needed there. In my case.
> class DataRow(SQLObject):
> type = StringCol()
> data = BLOBCol(length=2**24)
> text = UnicodeCol()
> row = ForeignKey('ProcessRow')
class DataRow(SQLObject):
type = StringCol()
data = BLOBCol(length=2**24)
text = UnicodeCol()
row = SingleJoin('ProcessRow')
and
>class ProcessRow(SQLObject):
> path = StringCol()
> status = StringCol()
> data = SingleJoin('DataRow')
>
class ProcessRow(SQLObject):
path = StringCol()
status = StringCol()
data = ForeignKey('DataRow')
This now works correctly:
r = ProcessRow.get(1)
print "STATUS:"+r.status
print "DATA:"+r.data.type
The other direction didn't work when retrieving ProcessRow and referring
to DataRow.
Maybe the documentation can mention something about this cardinality for
One-to-One mapping more clearly. Just a thought!
Darren
On Fri, 2008-11-14 at 09:08 -0500, Darren Govoni wrote:
> Hi,
> I read the documentation and it briefly mentions SingleJoin, but gives
> no example.
>
> I tried to use ForeignKey in the referenced class and SingleJoin in the
> primary class, but I get this error when retrieving.
>
> AttributeError: DataRow instance has no attribute 'processRowID'
>
> My classes are simple.
>
> class DataRow(SQLObject):
> type = StringCol()
> data = BLOBCol(length=2**24)
> text = UnicodeCol()
> row = ForeignKey('ProcessRow')
>
> class ProcessRow(SQLObject):
> path = StringCol()
> status = StringCol()
> data = SingleJoin('DataRow')
>
> r = ProcessRow(path='here',status='loading')
> datar=DataRow(data=d,type='binary',text='',row=r)
>
> I'm not sure how to set the 'data' attribute for a ProcessRow since
> both classes refer to each other. The DataRow SQL entry has a correct
> row_id column set, but when I try to read it back like this, gives
> error.
>
> r = ProcessRow.get(1)
> print "STATUS:"+r.status
> print "DATA:"+r.data.type <<<<< generates error
>
>
> thank you.
> Darren
>
>
>
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