Magento 1.9 Not able to create quote item

Question

I have the following function inside my model.This checks for the device id(custom column in sales quote) in database and if found and the qoute item has same product id then just updates the qty or else create a new quote.When I use this,It simply is not going to else part.Here is my code.

  public function _create(array $data)
{      
    $postParams = $this->getRequest()->getParams();
    $product_id=$postParams['product_id'];
    $qty=$postParams['qty'];
    $deviceId=$postParams['device_id'];
        $collection = Mage::getModel('sales/quote')->getCollection()->addFieldToFilter('device_id',  $deviceId);

foreach($collection as $item)
{

$quote = Mage::getModel('sales/quote')->load($item->getEntityId());
$cartItems = $quote->getAllItems();
foreach ($cartItems as $items) {
$productId = $items->getProductId();
 $qtys = $items->getQty();
if($productId==$product_id){
    $qtys+=$qty;
    $items->setQty($qtys);
    $ks=$items->getQty();
    $items->save();
    }
    else {

        $productModel = 'hello';

    }
}


}



     echo json_encode(array('success' => $productId,'quoteObj' => $productModel)); die;

}

Please help.Thanks

Updated : This code now updates the quantity as well as create a new quote if i pass same product id and device id .If same pid and device id is passed ith should only update not create another one.

public function _create(array $data)
{      
    $postParams = $this->getRequest()->getParams();
    $product_id=$postParams['product_id'];
    $qty=$postParams['qty'];
    $deviceId=$postParams['device_id'];
        $collection = Mage::getModel('sales/quote')->getCollection()->addFieldToFilter('device_id',  $deviceId);
        if ($collection->count()) {
            foreach($collection as $item)
{

$quote = Mage::getModel('sales/quote')->load($item->getEntityId());
$cartItems = $quote->getAllItems();
foreach ($cartItems as $items) {
$productId = $items->getProductId();
 $qtys = $items->getQty();
if (! $quote->hasProductId($product_id)) {

$productModel = Mage::getSingleton('catalog/product');
   $productObj = $productModel->load($product_id);
    if (!$quoteObj) {
       // echo 'if'; die;
        $quoteObj = new Mage_Sales_Model_Quote();
    }
    $store_id = Mage::app()->getStore()->getId();
    $storeObj = $quoteObj->getStore()->load($store_id);
    $quoteObj->setStore($storeObj);

    $quoteItem = Mage::getModel('sales/quote_item')->setProduct($productObj);
    $quoteItem->setQuote($quoteObj);
    $quoteItem->setQty($qty);
    $quoteItem->setStoreId($store_id);
    $quoteObj->addItem($quoteItem);
    $quoteObj->setStoreId($store_id);
    $quoteObj->collectTotals();
    $quoteObj->setCustomerId(null);
    $quoteObj->setDeviceId($deviceId); 
    $quoteObj->save();
    }
    else{
        $qtys+=$qty;
    $items->setQty($qtys);
    $ks=$items->getQty();
    $items->save();

    }

}

}
}
else{
$productModel = Mage::getSingleton('catalog/product');
   $productObj = $productModel->load($product_id);
    if (!$quoteObj) {
       // echo 'if'; die;
        $quoteObj = new Mage_Sales_Model_Quote();
    }
    $store_id = Mage::app()->getStore()->getId();
    $storeObj = $quoteObj->getStore()->load($store_id);
    $quoteObj->setStore($storeObj);

    $quoteItem = Mage::getModel('sales/quote_item')->setProduct($productObj);
    $quoteItem->setQuote($quoteObj);
    $quoteItem->setQty($qty);
    $quoteItem->setStoreId($store_id);
    $quoteObj->addItem($quoteItem);
    $quoteObj->setStoreId($store_id);
    $quoteObj->collectTotals();
    $quoteObj->setCustomerId(null);
    $quoteObj->setDeviceId($deviceId); 
    $quoteObj->save();
}



     echo json_encode(array('success' => $ds,'quoteObj' => $ks,'quoteObj' => $dss)); die;

}

Answer 1

to find if particular product is in quote

if (! $quote->hasProductId($product_id)) {
    // Product is not in quote so add your logic
}
else
{
   $item = $quote->getItemByProduct($product_id);
   $qty = $item->getQty();
   $item->setQty($qty);
   $items->save();
}

find is collection empty

if ($collection->count()) {
// Collection is not empty
}
else
{
}

After Update your code

public function _create(array $data)
{      
    $postParams = $this->getRequest()->getParams();
    $product_id=$postParams['product_id'];
    $qty=$postParams['qty'];
    $deviceId=$postParams['device_id'];
        $collection = Mage::getModel('sales/quote')->getCollection()->addFieldToFilter('device_id',  $deviceId);
        if ($collection->count()) {
            foreach($collection as $item)
            {
                $quote = Mage::getModel('sales/quote')->load($item->getEntityId());
                $cartItems = $quote->getAllItems();
                if (! $quote->hasProductId($product_id)) {

                    $productModel = Mage::getSingleton('catalog/product');
                    $productObj = $productModel->load($product_id);
                    if (!$quoteObj) {
                       // echo 'if'; die;
                        $quoteObj = new Mage_Sales_Model_Quote();
                    }
                    $store_id = Mage::app()->getStore()->getId();
                    $storeObj = $quoteObj->getStore()->load($store_id);
                    $quoteObj->setStore($storeObj);

                    $quoteItem = Mage::getModel('sales/quote_item')->setProduct($productObj);
                    $quoteItem->setQuote($quoteObj);
                    $quoteItem->setQty($qty);
                    $quoteItem->setStoreId($store_id);
                    $quoteObj->addItem($quoteItem);
                    $quoteObj->setStoreId($store_id);
                    $quoteObj->collectTotals();
                    $quoteObj->setCustomerId(null);
                    $quoteObj->setDeviceId($deviceId); 
                    $quoteObj->save();
                    break;
                }
                else{
                    $item = $quote->getItemByProduct($product_id);
                   $qty = $item->getQty();
                   $item->setQty($qty);
                   $items->save();
                   break;
                }


            }
        }
        else{
        $productModel = Mage::getSingleton('catalog/product');
           $productObj = $productModel->load($product_id);
            if (!$quoteObj) {
               // echo 'if'; die;
                $quoteObj = new Mage_Sales_Model_Quote();
            }
            $store_id = Mage::app()->getStore()->getId();
            $storeObj = $quoteObj->getStore()->load($store_id);
            $quoteObj->setStore($storeObj);

            $quoteItem = Mage::getModel('sales/quote_item')->setProduct($productObj);
            $quoteItem->setQuote($quoteObj);
            $quoteItem->setQty($qty);
            $quoteItem->setStoreId($store_id);
            $quoteObj->addItem($quoteItem);
            $quoteObj->setStoreId($store_id);
            $quoteObj->collectTotals();
            $quoteObj->setCustomerId(null);
            $quoteObj->setDeviceId($deviceId); 
            $quoteObj->save();
        }




     echo json_encode(array('success' => $ds,'quoteObj' => $ks,'quoteObj' => $dss)); die;

}