Hi Massimo,
You should "really" watch this lecture:
http://lanyrd.com/2011/pygotham/shpkm/#link-fkfb
I think you will like it, even if you son't like ORMs.
It shows some architectural diagrams that you might find interesting, for
both the Core layer and ORM layer of SQLAlchemy.
I think this would make clear the dichotomy between the two.
As the lecture shows, the Core and the ORM are actually separate code-bases
(though the ORM is built on-top of Core), so that people can actually not
use the ORM at all if they don't like to, and what they will be left eith,
is basically equivalent to what web2py provides - a DAL.
Since these are separate layers, I think what might be an interesting
research-project, is not re-inventing the wheel, but instead try to layer
SQLA's ORM on-top of web2py's DAL. The past-experiments I've seen where
trying to do the opposite, but I actually think that this makes more sense.
The modern way of generating an ORM class, is called the
"declarative-mapping" approach, in which you build the schema right into
the python classes ("decoratively"). This would be way to difficult to
re-instrument.
However, there still exist the 'older', more "dis-jointed" way of mapping
that they call "classical-mapping", which maps a completely regular python
classes to a 'Core' schema-object, and "generates" an ORM-class out of the
two using a 3'rd object called a "mapper".
It is basically taking a regular python class, and a schema that was built
using Core (in an almost identical fashion as it is done in the web2py-DAL)
and using a separate mapper-object to 'instrument' the schema into the
class, and thus generating an ORM class out of the merge of the two.
So I was thinking it might be interesting research-project, is to just try
to sub-class the mapper-object, and write a web2py-DAL-mapper variation,
that basically generates the same ORM, using the same kind of
instrumentation, but just using the web2py-DAL schema-object instead of the
SQLA-Core one.
What do you say?
Is that feasible?
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