php - How to change post meta for all products on product add in WooCommerce?

Solution:

You first need to fetch all of the WooCommerce Products (post type of "product"), loop over each of them, and update the post meta for each. You can run this code by placing it in yourfunctions.php in your theme, a file in the/wp-content/mu-plugins "must-use" plugins directory, or anonymously using a plugin like WordPress Developer + Console.

// args to fetch all products
$args = array(
    'post_type' => 'product',
    'posts_per_page' => -1
);

// create a custom query
$products = new WP_Query( $args );

// if products were returned...
if ( $products->have_posts() ):
    // loop over them....
    while ( $products->have_posts() ):
        // using the_post() to set up the $post
        $products->the_post();

        // use $post->ID to update the '_sync_status' post meta value
        update_post_meta( $post->ID, '_sync_status', 'on' );
    endwhile; 
endif;
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Solution:

Thank you its work for me i can update and add new post meta to my products.

// args to fetch all products
$args = array(
    'post_type' => 'product',
    'posts_per_page' => -1
);
// create a custom query
$products = new WP_Query( $args );
// if products were returned...
if ( $products->have_posts() ):
    // loop over them....
    while ( $products->have_posts() ):
        $products->the_post();
            if (get_post_meta(get_the_ID(),'slide_template')=="" || !get_post_meta(get_the_ID(),'slide_template')){
                update_post_meta( get_the_ID(), 'slide_template', 'default' );
                echo get_the_ID().' do it'.'<br>';
            }
    endwhile;
endif;
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Solution:

Thepre_post_update hook is called before the post is saved.

If you wish to do this when they get created or updated you can hijack the REQUEST array

add_action('pre_post_update', 'before_data_is_saved_function');
function before_data_is_saved_function($post_id) {
  if ($_REQUEST['post_type'] == 'product') {
    $_REQUEST['_sync_status'] = 'on';
  }
}
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If you only want to do this when they 'get added' use:

add_action('pre_post_update', 'before_data_is_saved_function');
function before_data_is_saved_function($post_id) {
  if ($_REQUEST['post_type'] == 'product' && $_REQUEST['publish'] = 'Publish') {
    $_REQUEST['_sync_status'] = 'on';
  }
}
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