[fw-db] need help with update

In my controller I have the following action;

function editqtyAction()
{
// Dissable view and layout.
$this->_helper->viewRenderer->setNoRender();
$this->_helper->layout()->disableLayout();

if ($this->_request->isPost()) {

// Get the parameters from request and store in an array.
$nest_components_id = $this->_request->getPost('nest_components_id');
$qty = $this->_request->getPost('qty');
$data = array('qty' => $qty);

// Push to the database.
$model = new Titanium_Model_NestComponents;
$where = 'nest_components_id = ' . $nest_components_id;
$id = $model->update($data, $where);
echo(qty);
}
}

However, I get a 500 internal server error. From the stack trace I can see the SQL generated is;

"UPDATE `nest_components` SET `qty` = ?, `modified_date` = ?, `modified_by_id` = ? WHERE (id=)"

So it looks like the WHERE clause is incorrect. I don't understand where the (id=) part is coming from, and why has it not used the where clause I specified?

Steve

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