Hi All, I have a mixin defined like this:
def add_exclude_constraint(mapper, class_): table = class_.__table__ elements = [('period', '&&')] for col in table.primary_key.columns: if col.name!='period': elements.append((col, '=')) table.append_constraint(ExcludeConstraint(*elements)) class Temporal(object): @declared_attr def __table_args__(cls): listen(cls, 'instrument_class', add_exclude_constraint) return ( CheckConstraint("period != 'empty'::tsrange"), ) period = Column(DateTimeRange(), nullable=False, primary_key=True) That listen call is the source of the dirty feeling... What's the "right" way to do this? Chris -- Simplistix - Content Management, Batch Processing & Python Consulting - http://www.simplistix.co.uk -- 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?hl=en. For more options, visit https://groups.google.com/groups/opt_out.