Comments on: Another Step-by-Step SqlAlchemy Tutorial (part 2 of 2)

By: Digimasterdoug

Digimasterdoug — Tue, 15 Jun 2010 10:29:38 +0000

this is hands down the best practical sqlalchemy tutorial ive encountered to date. thanks a ton!

By: Mike

Mike — Fri, 05 Feb 2010 19:05:33 +0000

@ jotr,

Added a note to that affect in that section. Mental note: don’t get interrupted when working on next tutorial…

- Mike

By: Mike

Mike — Fri, 05 Feb 2010 19:05:00 +0000

@ jotr,

Added a note to that affect in that section. Mental note: don’t get interrupted when working on next tutorial…

- Mike

By: jotr

jotr — Fri, 05 Feb 2010 19:00:58 +0000

I find the joins work better after calling session.add(prof).

By: jotr

jotr — Fri, 05 Feb 2010 19:00:00 +0000

I find the joins work better after calling session.add(prof).

By: Mike

Mike — Fri, 05 Feb 2010 00:33:09 +0000

@ jotr,

I actually tested all those methods on the declarative model…but yes, they all should work just fine.

Hmmm…looks like I dropped the create_all call from the declarative example. I just fixed that.

I messed around with the dirty call in Wing and discovered that if I add the user to the database with a session.commit() and then change one of the user’s attributes, then session.dirty picks it up. This is not clear in the official documentation. I updated this post to reflect that.

- Mike

By: Mike

Mike — Fri, 05 Feb 2010 00:33:00 +0000

@ jotr,

I actually tested all those methods on the declarative model…but yes, they all should work just fine.

Hmmm…looks like I dropped the create_all call from the declarative example. I just fixed that.

- Mike

By: jotr

jotr — Thu, 04 Feb 2010 22:43:06 +0000

Ah, I had to add a metadata.create_all(engine) after creating the metadata object. Also I notice that even though I alter the ‘mike_user’ object after calling session.add(), session.dirty does not reflect the change.

By: jotr

jotr — Thu, 04 Feb 2010 22:43:00 +0000

By: jotr

jotr — Thu, 04 Feb 2010 22:37:44 +0000

When I try to do a session.commit() after the session.add_all(…) example above, I get this error:

sqlalchemy.exc.OperationalError: (OperationalError) no such table: users u’INSERT INTO users (name, fullname, password) VALUES (?, ?, ?)’ ['mike', 'Mike Dirtskill', 'password']

Should the add_all() code work when appended to the declarative table definitions above?