On Jan 8, 2011, at 3:23 PM, Petra Clementson wrote: > I want to do a self join on combined but it wont let me. Essensially, > I want to join two different tables, and create aliases so I can > compare one column and make sure that each item in the column is > uniqe. If there are duplicates, I want my piece of code to show the > duplicates. Combining join with alias seems like the best way to do > this because when using other methods, if I change the duplicates to a > unique name, the name that used to be a duplicate still prints. Note > that the Header table has a foreign key reference to DiskFile and the > sql version used was 0.6.5. This is the portion of code where I am > getting an error: > > > combined = join(DiskFile, Header) > combined_alias = aliased(combined) > > > ERROR: > Traceback (most recent call last): > File "duplicatedl.py", line 32, in <module> > combined_1 = aliased(combined) > > File "/opt/sqlalchemy/lib/python2.5/site-packages/sqlalchemy/orm/ > util.py", line > 304, in __init__ > self.__target = self.__mapper.class_ > AttributeError: 'SQLCompiler' object has no attribute 'class_'
This could perhaps be improved in the interface; "aliased()" applies to mapped classes and mappers. join() is a Selectable expression. To alias a selectable, use its alias() method to generate an alias object: join(A, B).alias() I'll think about having orm.aliased() detect a selectable and return selectable.alias() in 0.7. -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalch...@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
