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Asked: 2026-05-24T16:29:22+00:00

I’m currently facing a problem in my Cherrypy application. Im my own custom session

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I’m currently facing a problem in my Cherrypy application.
Im my own custom session module, when performing session.add(), the exact same object gets updated twice.

cherrypy.request.SessionManager.user_data = user

try:

    db_session.add(cherrypy.request.SessionManager)
    db_session.commit()

Will Return

2011-06-21 09:16:48,991 INFO sqlalchemy.engine.base.Engine.0x...04cL BEGIN (implicit)
2011-06-21 09:16:49,015 INFO sqlalchemy.engine.base.Engine.0x...04cL SELECT ..... 
FROM "Clients_Users" 
WHERE "Clients_Users".username = %(username_1)s AND "Clients_Users".password = %(password_1)s 
LIMIT 1 OFFSET 0
2011-06-21 09:16:49,015 INFO sqlalchemy.engine.base.Engine.0x...04cL {'password_1': '123', 'username_1': u'1'}
2011-06-21 09:16:49,047 INFO sqlalchemy.engine.base.Engine.0x...04cL UPDATE "SYS_Sessions" SET user_data=%(user_data)s WHERE "SYS_Sessions".id = %(SYS_Sessions_id)s
2011-06-21 09:16:49,067 INFO sqlalchemy.engine.base.Engine.0x...04cL {'SYS_Sessions_id': 92L, 'user_data': <psycopg2._psycopg.Binary object at 0x8a7c06c>}
2011-06-21 09:16:49,071 INFO sqlalchemy.engine.base.Engine.0x...04cL COMMIT
2011-06-21 09:16:49,093 INFO sqlalchemy.engine.base.Engine.0x...04cL BEGIN (implicit)
2011-06-21 09:16:49,095 INFO sqlalchemy.engine.base.Engine.0x...04cL UPDATE "SYS_Sessions" SET user_data=%(user_data)s WHERE "SYS_Sessions".id = %(SYS_Sessions_id)s
2011-06-21 09:16:49,095 INFO sqlalchemy.engine.base.Engine.0x...04cL {'SYS_Sessions_id': 92L, 'user_data': <psycopg2._psycopg.Binary object at 0x8a8424c>}
2011-06-21 09:16:49,108 INFO sqlalchemy.engine.base.Engine.0x...04cL COMMIT

Has anyone seen this before ?

P.S This doesn’t happen in the rest of the modules I have made.

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1 Answer

  1. Editorial Team

    Ok , Sorry for such a great delay but i was on vacation.

    Anyway in order prevent the double commit , you need to remove the object from the session and you do that by using session.expunge().

    One More Thing .

    Using session.merge()
    Will allow you to reuse the object that was expunged,.

    Hope this helps someone in need.

    P.S : Keep into consideration that an object may misbehave or that any future patch to alchemy may break the compatibility.So profane is Right.

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