[symfony-users] sf1.4+doctrine how to override setter in model

[lking]

i have this schema

Product:
  columns:
    name:        string(255)
    description: clob
    price:                       { type:  decimal, scale: 4 }

Order:
  tableName:   m_order
  columns:
    total:                       { type:  decimal, scale: 4 }
  relations:
    Items:
      class: OrderItem
      local: id
      foreign: order_id
      type: many
      foreignType: one
      cascade: [delete]

OrderItem:
  columns:
    order_id:    integer
    product_id:  integer
    name:        string(255)
    price:
      type:  decimal
      scale: 4
    quantity:    integer
    total_price:
      type:  decimal
      scale: 4
  relations:
    Order:
      class: Order
      local:   order_id
      foreign: id
      type: one
      foreignType: many
      onDelete: CASCADE
    Product:
      local:   product_id
      foreign: id

i want to override methods OrderItem->setProduct() and OrderItem-
>setQuantity().

<?php

class OrderItem extends BaseOrderItem
{
  public function setProduct($product)
  {
    $this->_set('Product', $product);
    $this->setName($product->getName());
    $this->setPrice($product->getPrice());
    $this->calculate();
  }

  public function setQuantity($quantity)
  {
    $this->_set('quantity', $quantity);
    $this->calculate();
  }

  public function save(Doctrine_Connection $conn = null)
  {
    $this->calculate();

    return parent::save($conn);
  }

  private function calculate()
  {
    if ($this->getPrice() && $this->getQuantity()) $this->setTotalPrice
($this->getQuantity() * $this->getPrice());
  }
}

method OrderItem->setProduct() works in action but fails on load
fixtures with error
"Couldn't call Doctrine_Core::set(), second argument should be an
instance of Doctrine_Record or Doctrine_Null when setting one-to-one
references."

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