Magento 2 Mini-Cart Configurable Product Image Issue – Display Simple Product Image

Naing,add parent id filter

$collection = Mage::getModel('sales/order_item')->getCollection()

                       ->addFieldToSelect(array('order_id','sku','name','qty_ordered','product_id','product_options','row_total'))

                       //->setOrder('main_table.order_id', 'desc');
                       ->setOrder('main_table.created_at', 'desc');

        //  $collection->getSelect()->group('main_table.order_id');

To

$collection = Mage::getModel('sales/order_item')->getCollection()
  ->addFieldToSelect(array('order_id','sku','name','qty_ordered','product_id','product_options','row_total'))
    ->addFieldToFilter('parent_item_id',array(
        'null' => true,
        ))->setOrder('main_table.created_at', 'desc');

Can I suggest not touching the code to get this functionality? Perhaps you could do the following:

First up:
1. Change all simple product visibility to "Catalog" or "Not visible individually"
2. Make sure all the configurable products' visibility is set to "Catalog/Search" or "Search"

Option 1
Create a product attribute called "child_skus", make it used for quick search and add a comma separated list of the child SKUs.

Option 2
Add the child skus to the configurable product's meta keywords. Make sure the meta_keywords attribute is included in the quick search