Home › Forums › Backend Issues (wp-admin) › Custom fields on woocommerce product variations › Reply To: Custom fields on woocommerce product variations
WooCommerce Product Variations are *all* saved via a single POST request.
To differentiate between product variation fields, WooCommerce names each field field_name[variation_id]
so that it is accessible as $_POST['field_name'][$variation_id]
.
ACF field data is located in $_POST['acf'][...]
and can only have one of each field.
ACF’s acf()->input->save_post( $post_id )
method uses $_POST['acf']
data, so it cannot contain fields for another variation.
We need to allow duplicate ACF fields to exist within a single <form>
without having them overwrite each other’s value within $_POST['acf']
.
We can achieve this by renaming the field name prefix acf[...]
to acf_varation[variation_id][...]
and then set $_POST['acf']
to $_POST['acf_varation'][$variation_id]
when saving.
$GLOBALS['wc_loop_variation_id'] = null;
function is_field_group_for_variation($field_group, $variation_data, $variation_post) {
return (preg_match( '/Variation/i', $field_group['title'] ) == true);
}
add_action( 'woocommerce_product_after_variable_attributes', function( $loop_index, $variation_data, $variation_post ) {
$GLOBALS['wc_loop_variation_id'] = $variation_post->ID;
foreach ( acf_get_field_groups() as $field_group ) {
if ( is_field_group_for_variation( $field_group, $variation_data, $variation_post ) ) {
acf_render_fields( $variation_post->ID, acf_get_fields( $field_group ) );
}
}
$GLOBALS['wc_loop_variation_id'] = null;
}, 10, 3 );
add_action( 'woocommerce_save_product_variation', function( $variation_id, $loop_index ) {
if ( !isset( $_POST['acf_variation'][$variation_id] ) ) {
return;
}
$_POST['acf'] = $_POST['acf_variation'][$variation_id];
acf()->input->save_post( $variation_id );
}, 10, 2 );
add_filter( 'acf/prepare_field', function ( $field ) {
if ( !$GLOBALS['wc_loop_variation_id'] ) {
return $field;
}
$field['name'] = preg_replace( '/^acf\[/', 'acf_variation[' . $GLOBALS['wc_loop_variation_id'] . '][', $field['name'] );
return $field;
}, 10, 1);
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