minimal mapping + the query against that mapping.
On 6/26/14, 4:11 PM, Ken Lareau wrote: > On Thu, Jun 26, 2014 at 5:57 AM, Mike Bayer <mike...@zzzcomputing.com > <mailto:mike...@zzzcomputing.com>> wrote: > > > On 6/25/14, 8:06 PM, Ken Lareau wrote: >> On Wed, Jun 25, 2014 at 6:28 AM, Mike Bayer >> <mike...@zzzcomputing.com <mailto:mike...@zzzcomputing.com>> wrote: >> >> >> On 6/25/14, 2:26 AM, Ken Lareau wrote: >>> On Tue, Jun 24, 2014 at 3:35 PM, Mike Bayer >>> <mike...@zzzcomputing.com <mailto:mike...@zzzcomputing.com>> >>> wrote: >>> >>> >>> On 6/23/14, 8:09 PM, Ken Lareau wrote: >>> > >>> > if apptier: >>> > subq = ( >>> > Session.query( >>> > Package.pkg_name, >>> > Package.version, >>> > Package.revision, >>> > AppDefinition.app_type, >>> > AppDeployment.environment >>> > ).join(Deployment) >>> > .join(AppDeployment) >>> > .join(AppDefinition) >>> > .filter(Package.pkg_name == package_name) >>> > .filter(AppDeployment.environment == env) >>> > .filter(AppDeployment.status != >>> 'invalidated')) >>> > >>> > [...] >>> > >>> > # The actual column name must be used in the >>> subquery >>> > # usage below; DB itself should be corrected >>> > versions = (Session.query(subq.c.appType, >>> > subq.c.version, >>> > subq.c.revision) >>> > .group_by(subq.c.appType, >>> subq.c.environment) >>> > .all()) >>> > >>> > The parts in the subquery work fine, but the access of >>> the 'column' >>> > in the final query leads to this: >>> > >>> > Traceback (most recent call last): >>> > File "<stdin>", line 1, in <module> >>> > File >>> "/home/klareau/repos/git/tagopsdb/tagopsdb/deploy/deploy.py", >>> > line 234, in find_deployed_version >>> > .group_by(subq.c.appType, subq.c.environment) >>> > File >>> > >>> >>> "/home/klareau/.virtualenvs/tds/lib/python2.6/site-packages/sqlalchemy/util/_collections.py", >>> > line 174, in __getattr__ >>> > raise AttributeError(key) >>> > AttributeError: environment >>> > >>> > This is not completely surprising, but I'm uncertain >>> as the best way >>> > to fix this... help? :) >>> nothing is obviously wrong, assuming you are calling >>> "subquery()" on >>> subq at the end. It will be a select() construct which >>> will have a >>> column called ".environment" on the .c. collection because >>> AppDeployment.environment is present. Can't say why >>> this attribute is >>> not here without full details. >>> >>> >>> Oops there were some additional filters I left out, but this >>> is added >>> before the final query: >>> >>> subq = (subq.order_by(AppDeployment.realized.desc()) >>> .subquery(name='t_ordered')) >>> >>> Not sure why it isn't working, but today my coworker an I >>> massively >>> rewrote one of the other methods to avoid this same issue, >>> so maybe >>> we should try the same for this one... though it would be >>> nice to know >>> what I goofed here, but not sure what additional information >>> I can >>> give that would help offhand... >> >> what are the names that are actually present on subq.c ? >> "print list(subq.c)" should give an indication. >> >> >> Adding that in to the method gave this: >> >> >>> deploy.find_deployed_version('tdstest', 'development', >> version='9', apptier=True) >> [Column('pkg_name', String(length=255), table=<t_ordered>, >> nullable=False), Column('version', String(length=63), >> table=<t_ordered>, nullable=False), Column('revision', >> String(length=63), table=<t_ordered>, nullable=False), >> Column('appType', String(length=100), table=<t_ordered>, >> nullable=False), <sqlalchemy.sql.elements.ColumnClause at >> 0x1d20e10; %(30521360 anon)s>] >> Traceback (most recent call last): >> File "<stdin>", line 1, in <module> >> File >> "/home/klareau/repos/git/tagopsdb/tagopsdb/deploy/deploy.py", >> line 237, in find_deployed_version >> .group_by(subq.c.appType, subq.c.environment) >> File >> >> "/home/klareau/.virtualenvs/tds/lib/python2.6/site-packages/sqlalchemy/util/_collections.py", >> line 174, in __getattr__ >> raise AttributeError(key) >> AttributeError: environment > you need to put .label('environment') on that column before it > finds its way into subq. I dont have the mappings here to review. > > for the next go around please just provide a one-file example of > the mapping plus the query, thanks. > > Do you desire the example to be fully functional, or just have the > relevant > mapping and query? We ran into the same issue with another query and > ended up completely reworking the code to avoid the subquery, but it in- > volves quite a bit of various mappings and I'm uncertain if it's the > proper > way to move forward. I could try to post the before/after here, but if it > needs to be able to to run standalone it may take me a bit of time to get > it into a fully workable state (given how extensive it is). > > > -- > - Ken Lareau > > -- > You received this message because you are subscribed to the Google > Groups "sqlalchemy" group. > To unsubscribe from this group and stop receiving emails from it, send > an email to sqlalchemy+unsubscr...@googlegroups.com > <mailto:sqlalchemy+unsubscr...@googlegroups.com>. > To post to this group, send email to sqlalchemy@googlegroups.com > <mailto:sqlalchemy@googlegroups.com>. > Visit this group at http://groups.google.com/group/sqlalchemy. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To unsubscribe from this group and stop receiving emails from it, send an email to sqlalchemy+unsubscr...@googlegroups.com. 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