Hi, I am new in OpenERP's domain.

My question is : I want to show in customer view the date of his first command, may u plz help me?

This is my code, but it doesn't work :

class res_partner(osv.osv):
    _inherit = "res.partner"
        def _get_date_first_order(self, cr, uid, ids, name, partner_id, arg, context=None):
        res = {}
        for id in ids :
            cr.execute("""select
                    min(date_order)
                from
                    sale_order """,(tuple(ids),))
        return res

    _columns = {
        'customer_date_order': fields.function(_get_date_first_order, method=True, store=True, type='datetime', string='Date First order', select=1),
        }
res_partner()