public function getCustomers($criteria = null, PropelPDO $con = null)
    {
        $partial = $this->collCustomersPartial && !$this->isNew();
        if (null === $this->collCustomers || null !== $criteria  || $partial) {
            if ($this->isNew() && null === $this->collCustomers) {
                // return empty collection
                $this->initCustomers();
            } else {
                $collCustomers = CustomerQuery::create(null, $criteria)
                    ->filterByCountry($this)
                    ->find($con);
                if (null !== $criteria) {
                    if (false !== $this->collCustomersPartial && count($collCustomers)) {
                      $this->initCustomers(false);

                      foreach ($collCustomers as $obj) {
                        if (false == $this->collCustomers->contains($obj)) {
                          $this->collCustomers->append($obj);
                        }
                      }

                      $this->collCustomersPartial = true;
                    }

                    $collCustomers->getInternalIterator()->rewind();

                    return $collCustomers;
                }

                if ($partial && $this->collCustomers) {
                    foreach ($this->collCustomers as $obj) {
                        if ($obj->isNew()) {
                            $collCustomers[] = $obj;
                        }
                    }
                }

                $this->collCustomers = $collCustomers;
                $this->collCustomersPartial = false;
            }
        }

        return $this->collCustomers;
    }