Question

I’m trying to implement an abstract class on OpenERP 6. But I don’t have any idea. For example. I have “a” and “b” classes. “b” class inherits “a” (See below code)

class a(osv.osv):
    _name = 'a'
    _columns = {
            'state': fields.selection(A_WORKFLOWS, 'State', readonly=True)
        }

# create an object
a()

class b(osv.osv):
    _name = 'b'
    _inherit='a'
    _columns = {
            'name' : fields.char('Name', size=64, required=True)
        }

# create an object
b()

When I upgrade module “a” class generated in database. I don’t want it. I want to use the “a” class like abstract class in OpenERP.

Answer 1

Starting with OpenERP 6.1 (the upcoming release), openerp.osv.orm is providing an AbstractModel class. Before that, it was possible to achieve what you want by using an osv_memory as a base class.