thanks, I will start experimenting ... On Mar 5, 4:52 pm, Michael Bayer <mike...@zzzcomputing.com> wrote: > On Mar 5, 2011, at 10:43 AM, farcat wrote: > > > > > > > > > > > Hi, > > > I am trying to implement polymorphism and multiple inheritance by: > > > - adding a column to the parent class/table indicating the table from > > which the (polymorphic) class attribute object can be queried > > - adding the attribute name and the parent id to the child table/class > > to be able to find the attribute object in this table > > > Now i want to use a descriptor and/or override __getattr__/__setattr__/ > > __getattribute__ to insert or get the correct (polymorphic) object > > from the correct table. > > > What I was wondering was e.g. whether using a descriptor will inhibit > > SA from functioning correctly. Any tips to implement what i am trying > > to do would be very welcome. > > SQLAlchemy uses descriptors for all the mapped attributes and has several > avenues to augmenting them with your own descriptors. __getattribute__ and > __setattr__ work as expected, as does __getattr__ although that only applies > to names that otherwise don't exist on the object. > > We encourage an extremely simple approach to descriptor access which is to > name the columns in one way, and the descriptor in another. The "synonym" > construct does this as does the newer "hybrid attribute" approach. Set and > delete events can also be intercepted using the events module (new in 0.7 - > in 0.6 use AttributeExtension). > > > > > > > > > > > Cheers, Lars > > > -- > > You received this message because you are subscribed to the Google Groups > > "sqlalchemy" group. > > To post to this group, send email to sqlalchemy@googlegroups.com. > > To unsubscribe from this group, send email to > > sqlalchemy+unsubscr...@googlegroups.com. > > For more options, visit this group > > athttp://groups.google.com/group/sqlalchemy?hl=en.
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