eiru_pos/controllers/res_currency.py

# -*- coding: utf-8 -*-
from openerp.http import request

_MODEL = 'res.currency'

def check_base_currency():
    base_currency = request.env[_MODEL].search([('base', '=', True)])

    if not base_currency:
        request.env.user.company_id.currency_id.write({
            'base': True
        })