I'm writing some object module in Perl using Moose. I use to store instances of created objects then use them.
The basic representation of my object's data remains the same, but from time to time I add more functionalities - e.g. class methods or object methods.
Can I continue using my stored objects, which were created with an earlier version of the module, with the new functionalities? Or must I create the objects again every time I change the module?
What is the common paradigm for developing an object module where the basic data structure does not change but functionalities do?
As long as the data structure doesn't change, you should be fine: the data is slurped and reblessed into your class' namespace: this ensures new methods would be available on that data.
BEWARE changing the data structure though!
I don't see much wrong with it, although for some uses you could just use a database to store your data, and access it in a OO fashion using one of the many ORM (DBIx::Class, Fey::ORM or whichever).