[Catalyst] Objects and persistence

Marco Vittorini Orgeas marco at mavior.eu
Fri Jan 30 15:43:35 GMT 2009

I am approching in those days the Catalyst framework.
I am also quite new to persistence of Objects, and therefore before start building my application I need some
clarifications, because I don't want to get myself in the wrong
direction in the middle of the work.
The point is:  let's say that I have a good amount of logic of my application coded in a Object
oriented way with moose (thus I have all the goodness of a OO
approach: so inheritance, moose rooles, moose checks of attributes' types and all what OO gives).
Well from what I've read all I have to do to plug-in my code is just use my Objects and methods in some controller: now the problem is that I obviously need persistence.
Now, always reading tutorials on the topic,seems that DBIx::Class is the
common approach to map Objects to and from rdbms, but from what I've read from the code
of this module I think there's slightly abuse of notation: the
overmentioned module gives me a OO API to query my RDBM (as also
class::DBI gives)hiding all the SQL operations from me(at least partially).Now I could be horribly wrong here...

The problem is, how to "really" maps my (moose) objects to rdbm tables ? DBIx 
gives me his objects...to use "my" objects after have retrieved them I
need some sort of casting or even re-create(bless) them from the retrieved informations
of DBIx every time.

Probably I should specify here that I am thinking at the problem
after have seen how an OR mapper as Java's Hibernate approaches the
Objects <--> RDBM problems...that is, strongly map your plain old java
classes attributes to table fields, and after some cast I've back

Again I could miss the whole point of DBIx:Class and his overall
approach: casting or blessing again a lot of objects to apply them my
classes methods is worth the
overhead that this produce? Or it's better to play just with objectified retrieved informations and re-implement my objects roles (methodes) as controller
subroutines and pass them DBIX objects?

Thank you

Marco Vittorini Orgeas

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