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First things first: This is my first question posted on stackoverflow. Put another way, this is the first problem I could not solve by myself with your help (huge thanks to all of you, you make the world go round!).

My question is related to an answer given by @LoictheAztec to another question (I originally planned to post my question in the comments of that post but being the lurker that I am/was, I lack the reputation to do so): https://stackoverflow.com/a/47766413/13263330

I have created a variable product and would like to add new attribute values to this product programmatically.

I copied and slightly modified the code from the link above but when I tried to execute it, I received the following errors: 

Notice: wc_get_product was called incorrectly. wc_get_product should not be called before the woocommerce_init, woocommerce_after_register_taxonomy and woocommerce_after_register_post_type actions have finished. Backtrace: require_once('wp-load.php'), require_once('wp-config.php'), require_once('wp-settings.php'), do_action('plugins_loaded'), WP_Hook->do_action, WP_Hook->apply_filters, execute_active_snippets, execute_snippet, eval, create_product_variation, wc_get_product, wc_doing_it_wrong

Fatal error: Uncaught Error: Call to a member function get_name() on boolean

The problem mainly seems to be about the following line of code in the link posted above:

'post_title'  => $product->get_name()

Just as a reminder and for convenience reasons, the product variable is defined as follows:

$product = wc_get_product($product_id)

The attribute values are correctly added to the variable product, so the code does what I expected and intended it to do but the site still crashes.

As far as I understand the situation, problems (and their causes) occuring could be related to:

  1. The modifications I made in the code (already checked with default code and example given by @LoictheAztec within his post, same problem)
  2. As always, compatibility issues with plugins and/or theme (already checked, deactivated all other plugins and changed to default theme; also tried code with fresh WP installation)
  3. According to an answer given to someone having a similar problem (https://github.com/woocommerce/woocommerce/issues/23160), the issue can also be caused by the $product variable not being correctly "associated with a valid product" (not sure about this one but I think the "parent" variable product already created is fine) or "the product no longer existing" (can definitely rule this one out).

Any help whatsoever is highly appreciated.

Henry93272
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  • Where and when did you call your function? which hook did you use? –  Apr 19 '20 at 14:15
  • I copied the full code from the first link, including the code for the example product variation and inserted it in a snippet of the Code Snippets plugin. The function is run at the bottom of the script within the code example given by @LoictheAztec: // The function to be run create_product_variation( $parent_id, $variation_data ); – Henry93272 Apr 19 '20 at 18:29

1 Answers1

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If you are using Code Snippets plugins, Please try following code. (Run example code within woocommerce hook)

add_action('woocommerce_after_register_post_type', 'test_create_product_variation');
function test_create_product_variation(){
    $parent_id = 746; // Or get the variable product id dynamically

    // The variation data
    $variation_data =  array(
        'attributes' => array(
            'size'  => 'M',
            'color' => 'Green',
        ),
        'sku'           => '',
        'regular_price' => '22.00',
        'sale_price'    => '',
        'stock_qty'     => 10,
    );

    // The function to be run
    create_product_variation( $parent_id, $variation_data );
}