-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 F. Oliver Gathmann wrote: > On 11/12/09 1:00 PM, Tim Hoffman wrote: >> Hi >> >> I have done some fairly extensive projects using traversal over a >> relational model and we did use intermediate container classes alot. >> Mainly because each major entity could have about 6 different classes >> of sub items that we needed to group into containers anyway >> >> I reverse engineered the entire relational model from the existing >> database and then autogenerated all of the intermediate classes. >> Quite easy to do. I was using storm as an orm over the top, which >> made things a lot easier > Hmm... still, this feels like an artifact to me. Presumably, in most > cases what you want to return when the URL asks for a collection of > sub-items is the very collection you already defined in your ORM on the > model object that is the current context (we are using SQLAlchemy, BTW). > I cannot help but think that there should be a way to automatically > return an adapted collection that supports further traversal if > necessary... but I'm not sure of all the ramifications of that idea.
You might check out the BFG + Storm tutorial I dashed off: http://bfg.repoze.org/tutorialbin/6/ There, the container is responsible for mapping the URL segment onto the ID used to look up the contained item from the ORM. It also provides an '__iter__' API for iterating the contents (for views on the container itself) as well '__delitem__' as for removing an item, which is logically an operation on the container in traversal land (think of a directory on a filesystem). Tres. - -- =================================================================== Tres Seaver +1 540-429-0999 tsea...@palladion.com Palladion Software "Excellence by Design" http://palladion.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkr8QzYACgkQ+gerLs4ltQ4bVQCdFtmdMPJh7Ud5fEcZcqVYeNvL ynMAnAyeEjZIzQ7pshPpxGXYcBneUBi8 =Dvif -----END PGP SIGNATURE----- _______________________________________________ Repoze-dev mailing list Repoze-dev@lists.repoze.org http://lists.repoze.org/listinfo/repoze-dev
