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OpenERP is a very flexible open-source ERP system, which handles accounting, CRM, sales, purchasing, manufacturing, and many other business functions.
It is written in Python but has an XML-RPC API so we can control all of its functions from Perl. However, despite OpenERP having an object-oriented architecture the API is quite 'low-level', and using it is a very different experience compared to having an ORM like DBIx::Class.
OpenERP::OOM (Object to Object Mapper) bridges this gap, letting us use Moose classes to represent the OpenERP schema. As with an ORM, the schema and object classes can be extended with our own methods and functions.
With this approach the underlying interface to OpenERP becomes transparent - everything is done with Perl - which means we can write Catalyst models, extend OpenERP with CPAN modules, and use all of OpenERP's functions from our Perl code.
Presented at the YAPC Europe 2012 conference in Frankfurt, Germany.