I have following table: class Group(DeclarativeBase): """ Group definition
Only the ``group_name`` column is required. """ __tablename__ = 'tg_group' id = Column(Integer, autoincrement=True, primary_key=True) group_name = Column(Unicode(16), unique=True, nullable=False) display_name = Column(Unicode(255)) created = Column(DateTime, default=datetime.now) users = relation('User', secondary=user_group_table, backref='groups') 'id' used to be 'group_id'. I am using TGII and just wrote a migration script to change the 'group_id' field to 'id'. I then manually went into class (above) and changed it to 'id' as well. Now upon running my project, I get following error message: sqlalchemy.exc.ArgumentError: Mapper Mapper|Group|tg_group could not assemble any primary key columns for mapped table 'tg_group' I am at a loss as to why this is happening. I changed all the references to the 'group_id' field to 'id'. Googl'ing this error often comes with a solution that some table does not have a primary key, but I do not see how this could be the case here - as I clearly state 'primary_key = True' for the 'id' field. Can anyone please help me with the trouble shooting? -- 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. To post to this group, send email to sqlalchemy@googlegroups.com. Visit this group at http://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/groups/opt_out.