Can I use custom code to set default variations for imported products

1. First, create a function to set the default attributes for a variable product:

php
function set_default_attributes($product_id, $default_attributes) {
  $product = wc_get_product($product_id);
  
  if (!$product || !$product->is_type('variable')) {
    return;
  }
  
  $default_attrs = array();
  foreach ($default_attributes as $taxonomy => $term_slug) {
    $default_attrs[sanitize_title($taxonomy)] = $term_slug;
  }
  
  update_post_meta($product_id, '_default_attributes', $default_attrs);
}

2. Then, in your WP All Import Function Editor, you can call this function after importing each product:

php
$post_id = $post_id; // Provided by WP All Import
$product_type = $product_type; // Field from import file

// Only proceed if this is a variable product
if ($product_type == 'variable') {
  
  // Define your default attributes
  // This could be based on data in your import file
  $default_attributes = array(
    'pa_color' => 'red',
    'pa_size' => 'medium'
  );
  
  // Set the default attributes
  set_default_attributes($post_id, $default_attributes);
}

This code will set the default variation for each imported variable product to have the color "red" and size "medium". You can adjust these values based on your specific needs or data in your import file[1][3].

A few important points to note:

1. Make sure your attribute names match exactly what's in WooCommerce (e.g., 'pa_color' for the color attribute).

2. The attribute values (like 'red' and 'medium') should match the slug of the attribute term, not necessarily its display name.

3. This code assumes you're importing variable products. You may need to adjust it if you're importing simple products or other types.

4. Remember that setting a default variation doesn't automatically make it selected on the frontend. To force a default selection, you might need additional code or a plugin[4].

5. If you're importing a large number of products, consider using WP All Import's "Run PHP functions after import" feature to run this code in bulk after the import is complete, rather than for each individual product during import.

By using this approach, you can automatically set default variations for your imported products, saving time and ensuring consistency across your WooCommerce store[2][5].