Any way to Overwrite get_stock_quantity in my functions.php? - wordpress

Question

I am working in Wordpress Multisite and trying to ensure that all the stock info is fetched from the base site tables. I am trying to overwrite get_stock_quantity() woocomerce function in my theme's functions.php. What i found was
public function get_stock_quantity( $context = 'view' ) {
return $this->get_prop( 'stock_quantity', $context );
}
Now this is neither a filter nor an action. I overwrote one filter that is
add_filter( 'woocommerce_product_get_stock_quantity', 'wcs_custom_get_stock_quantity', 1, 2);
function wcs_custom_get_stock_quantity( $availability, $_product ) {
global $wpdb;
$productQuantity = $wpdb->get_results( 'SELECT * FROM '.$wpdb->base_prefix.'postmeta WHERE post_id = '.$_product->get_id() ." AND meta_key = '_stock'", OBJECT );
return $productQuantity[0]->meta_value;
}
But woocommerce_product_get_stock_quantity only works on the Products List page. The individual product-edit page uses get_stock_quantity.
How can I overwrite it without changing Core files?
Thanks

Answer 1

The correct way to alter get_stock_quantity() method depends on the product. AS you have already notice looking at the source code you see that:
return $this->get_prop( 'stock_quantity', $context );
Now get_prop() method is a part of WC_Data class and has a generic filter hook:
$value = apply_filters( $this->get_hook_prefix() . $prop, $value, $this );
And if you look to get_hook_prefix() method you have this:
return 'woocommerce_' . $this->object_type . '_get_';
For product variations the object_type is: product_variation
For other products the object_type is: product
The $prop argument is stock_quantity
So know you can built the related filter hooks. Try this:
add_filter( 'woocommerce_product_get_stock_quantity' ,'custom_get_stock_quantity', 10, 2 );
add_filter( 'woocommerce_product_variation_get_stock_quantity' ,'custom_get_stock_quantity', 10, 2 );
function custom_get_stock_quantity( $value, $product ) {
$value = 15; // <== Just for testing
return $value;
}
So for product variations you use woocommerce_product_variation_get_stock_quantity filter hook.
And for the other cases woocommerce_product_get_stock_quantity filter hook

Answer 2

You can update the database, but remember this code is executed one time each time you list your products, and when you update your product
add_filter( 'woocommerce_product_get_stock_quantity' ,'custom_get_stock_quantity', 10, 2 );
add_filter( 'woocommerce_product_variation_get_stock_quantity' ,'custom_get_stock_quantity', 10, 2 );
function custom_get_stock_quantity( $value, $product ) {
$value = 15; // <== Just for testing
//update dabatabase:
update_post_meta( $product->get_id(), '_stock', $value );
return $value;
}

Answer 3

From what I understand you can use $product->set_stock($value); as well to set the value in database
add_filter( 'woocommerce_product_get_stock_quantity' ,'custom_get_stock_quantity', 10, 2 );
add_filter( 'woocommerce_product_variation_get_stock_quantity' ,'custom_get_stock_quantity', 10, 2 );
function custom_get_stock_quantity( $value, $product ) {
$value = 15; // <== Just for testing
//update dabatabase:
$product->set_stock($value);
return $value;
}