Output error with get_post_meta in woocommerce - wordpress

Question

I am trying to add a custom metabox in woocommerce. It has been added perfectly. My ultimate goal is to call that custom field in a function and show it in the cart.php. So I coded :
For Custom field: [I would refer http://www.remicorson.com/mastering-woocommerce-products-custom-fields/] in this regard
add_action( 'woocommerce_product_options_general_product_data', 'woo_add_custom_general_fields' );
// Save Fields
add_action( 'woocommerce_process_product_meta', 'woo_add_custom_general_fields_save' );
function woo_add_custom_general_fields() {
global $woocommerce, $post;
echo '<div class="options_group">';
woocommerce_wp_text_input(
array(
'id' => 'number_field',
'label' => __( '<strong style="color:#239804">Your Free Products</strong>', 'woocommerce' ),
'placeholder' => '',
'description' => __( 'Please enter a number', 'woocommerce' ),
'type' => 'number',
'custom_attributes' => array(
'step' => 'any',
'min' => '0'
)
)
);
echo '</div>';
}//woo_add_custom_general_fields
function woo_add_custom_general_fields_save( $post_id ){
$woocommerce_number_field = $_POST['number_field'];
if( !empty( $woocommerce_number_field ) )
update_post_meta( $post_id, 'number_field', esc_attr( $woocommerce_number_field ) );
}//woo_add_custom_general_fields_save( $post_id )
It has perfectly fitted in the Product Admin Page. Now I am creating another function where I am creating a counter for cart.php
function free_products(){
global $woocommerce ,$product, $post;
foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {
$free_number = get_post_meta( $post->ID, 'number_field', true );
$free_product = $cart_item['quantity'] * $free_number;
echo apply_filters( 'woocommerce_cart_item_quantity', $free_product, $cart_item_key );
}
}
In My cart.php when I add
<td class="product-quantity">
<?php
echo free_products();
?>
</td>
The output become zero in front end. Can anyone please help me what I am going wrong. Thanks in advance.

Answer 1

Try below code :
function free_products(){
global $woocommerce ,$product, $post;
foreach ( WC()->cart->get_cart() as $cart_item ) {
$my_var = $cart_item['product_id'];
$free_number = get_post_meta( $my_var, 'number_field', true );
$free_product = $cart_item['quantity'] * $free_number;
echo apply_filters( 'woocommerce_cart_item_quantity', $free_product);
}
}
Let me know if It is working for you or not.Its working for me.