On Oct 27, 2010, at 11:43 AM, Nikolaj wrote: > I have a mapped class called Widget, with an uninstrumented attribute > called 'owner' (i.e. it does not have a column representation). Widget > has a MapperExtension with a before_update() method that runs a couple > of queries using connection.execute() and sets some attributes on the > instance. > > I would like Widget.owner to behave like an instrumented attribute in > the sense that modifying it forces a MapperExtension.before_update() > run at flush-time. Is that possible? > > Alternatively, is there a way to force a before_update() run by > marking an instance as dirty (possibly by modifying attributes without > actual net changes)? In that case I could make Widget.owner into a > property and mark the instance dirty in the setter.
that last idea would work and would be forwards-compatible. Otherwise you'd need to emit a modified event to instance_state(myobject) which isn't public API. > > Thanks, > > N > > -- > You received this message because you are subscribed to the Google Groups > "sqlalchemy" group. > To post to this group, send email to sqlalch...@googlegroups.com. > To unsubscribe from this group, send email to > sqlalchemy+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/sqlalchemy?hl=en. > -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalch...@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
