On Sat, Jan 8, 2011 at 10:38 AM, Michael Bayer <mike...@zzzcomputing.com>wrote:
> > 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. > > > Thanks for your prompt reply! This looks like something I haven't tried but would probably work. I'll have to try it on Monday and let you know how it goes. > -- > 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<sqlalchemy%2bunsubscr...@googlegroups.com> > . > For more options, visit this group at > http://groups.google.com/group/sqlalchemy?hl=en. > > -- 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.
