admin edit.php saves but doesn't retrieve data from "params" database field

Question

I have a config.xml with some parameters for my component.

I need to define these parameters for each individual item.

So in admin/models/forms/myview.xml, I've written my fields:

<fields name="params">
    <fieldset name="params" label="JGLOBAL_FIELDSET_DISPLAY_OPTIONS">
    ...etc

and in my admin/tables/myview.php, inside the "bind" function

if (isset($array['params']) && is_array($array['params']))
{
    // Convert the params field to a string.
    $parameter = new JRegistry;
    $parameter->loadArray($array['params']);
    $array['params'] = (string)$parameter;
}

The form is able to save data "params" in the database, but doesn't retrieve any params if saved.

Answer 1

To resolve the behaviour, I've deleted this function:

public function getItem($pk = null)
{
    if ($item = parent::getItem($pk))
    {
        if (isset($item->params))
        {
            $item->params = json_encode($item->params);
        }
    }
    return $item;
}