Magento Saving Multiselect Value on Custom Model - magento

Question

I have create a custom model in Magento which can get to and edit in the admin. I'm having trouble dealing with array's however. When I go to save the model, the text field saves fine, but the multiselect field just saves as 'array' and I'm then unable to go and edit it.
I need to know how to save seperate row in databse not comma seprate .
Can anybody help with this? Any help much appreciated!!!
public function saveAction() {
if ($data = $this->getRequest()->getPost()) {
if(isset($_FILES['image']['name']) && $_FILES['image']['name'] != null) {
try {
/* Starting upload */
$uploader = new Varien_File_Uploader('image');
// Any extention would work
$uploader->setAllowedExtensions(array('jpg','jpeg','gif','png'));
$uploader->setAllowRenameFiles(false);
// Set the file upload mode
// false -> get the file directly in the specified folder
// true -> get the file in the product like folders
// (file.jpg will go in something like /media/f/i/file.jpg)
$uploader->setFilesDispersion(false);
// We set media as the upload dir
$path = Mage::getBaseDir('media') . DS.'magentothem/vendorlist'.DS ;
$uploader->save($path, $_FILES['image']['name'] );
} catch (Exception $e) {
}
//this way the name is saved in DB
$basepath=Mage::getBaseUrl().'media/magentothem/vendorlist/';
$basepath=str_replace("index.php/","",$basepath);
$data['image'] = '<img src="'.$basepath.$_FILES['image']['name'].'" width="150" height="100px" alt="" />';
}
**$data['productid'] = join("," ,$_POST['productid']);**
$model = Mage::getModel('vendorlist/vendorlist');
$model->setData($data)->setId($this->getRequest()->getParam('id'));
try {
if ($model->getCreatedTime == NULL || $model->getUpdateTime() == NULL) {
$model->setCreatedTime(now())
->setUpdateTime(now());
} else {
$model->setUpdateTime(now());
}
$model->save();
Mage::getSingleton('adminhtml/session')->addSuccess(Mage::helper('vendorlist')->__('Item was successfully saved'));
Mage::getSingleton('adminhtml/session')->setFormData(false);
if ($this->getRequest()->getParam('back')) {
$this->_redirect('*/*/edit', array('id' => $model->getId()));
return;
}
$this->_redirect('*/*/');
return;
} catch (Exception $e) {
Mage::getSingleton('adminhtml/session')->addError($e->getMessage());
Mage::getSingleton('adminhtml/session')->setFormData($data);
$this->_redirect('*/*/edit', array('id' => $this->getRequest()->getParam('id')));
return;
}
}
Mage::getSingleton('adminhtml/session')->addError(Mage::helper('vendorlist')->__('Unable to find item to save'));
$this->_redirect('*/*/');
}

Answer 1

if you want separate rows in your table, I assume the the id column is not the PK.
In this case you could try:
$model = Mage::getModel('vendorlist/vendorlist');
$productIds = Mage::app()->getRequest()->getParam('productid');
foreach ($productIds as $productId) {
$model->setData($data)->setProductid($productId)->setId($this->getRequest()->getParam('id'));
try {
if ($model->getCreatedTime == NULL || $model->getUpdateTime() == NULL) {
$model->setCreatedTime(now())
->setUpdateTime(now());
} else {
$model->setUpdateTime(now());
}
$model->save();
//remove what is after, put it after the try/catch
} catch (Exception $e) {
//handle exception
}
}