Awesome, this is exactly what I needed. Thanks Michael.
On Sat, Dec 29, 2012 at 4:36 PM, Michael Bayer <mike...@zzzcomputing.com>wrote: > > On Dec 29, 2012, at 5:45 PM, Michael Bayer wrote: > > > > > On Dec 29, 2012, at 3:03 AM, Gerald Thibault wrote: > > > >> I'll post a test case later if needed, but this is more of a technical > question so i don't think it will be needed. > >> > >> When i use iterate_properties on a class with a hybrid_property, it's > not shown in the list. I am trying to 'extract' fields from classes in > order to automatically build forms from them. iterate_properties was useful > for getting most info, but eventually i had to start using 'for k in > dir(class)' to get access to association proxies on the classes. I would > use getattr(cls, k) to get the object, but for hybrid properties this calls > fget, and directly returns a BinaryExpression, rather than the property > itself. The only way I can find to access the actual hybrid_property object > is via vars(cls), and then, this doesn't contain hybrid properties defined > on the bases which are being used by the class. > >> > >> Is there a way built into sqlalchemy to get all hybrid_property objects > for a class, both those declared on the active class and those declared on > the base classes? I'm mainly interested in determining whether a setter has > been provided on the property, to determine if it's readonly or not. > > > > > > There's no API system of reading non-MapperProperty objects, which > includes all the various descriptors we have in sqlalchemy.ext. It > might be nice to add such an API to do so and make this an extension of the > 0.8 inspect() system, but anyway for now when you read class-bound > descriptors like this, you have to work around the fact that they have > classbound behavior, which means you can't use getattr(). > > I've added this feature to the tip for 0.8.0: > > from sqlalchemy import inspect > > insp = inspect(MyClass) # note this is just the Mapper, as usual > > for k, v in insp.all_orm_descriptors: > if v.extension_type is associationproxy.ASSOCIATION_PROXY: > # ... > elif v.extension_type is hybrid.HYBRID_PROPERTY > # ... > > # etc. > > see > http://docs.sqlalchemy.org/en/latest/orm/mapper_config.html#sqlalchemy.orm.mapper.Mapper.all_orm_descriptors > > > -- > 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 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 sqlalchemy@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.
