My_Cutsom_Table::prepare_items($registrations) must be compatible with WP_List_Table::prepare_items()

Question

I wrote a custom plugin and trying to extend WP_List_Table. Its worked fine in older WordPress versions, But when i upgraded to wordpress 6.0 am getting following erro.

My_Cutsom_Table::prepare_items($additions) must be compatible with WP_List_Table::prepare_items()

Following is my code

class My_Cutsom_Table extends WP_List_Table {

    function get_columns()
     {
        $columns = array(
            'display_name' => 'User',
            'user_email' => 'Email',
            'company' => 'Company',
        );
        return $columns;
    }

    public function prepare_items() {
        $columns = $this->get_columns();
        $hidden = array();
        $sortable = $this->get_sortable_columns();
        $this->_column_headers = array($columns, $hidden, $sortable);
        $this->items = $registrations;
    }

    function get_sortable_columns() {
        $sortable_columns = array(
            'display_name' => array('display_name', false),
            'user_email' => array('user_email', false),
            'company' => array('school', false),
            'created_at' => array('created_at', false)
        );
        return $sortable_columns;
    }

    function column_default($item, $column_name) {

        if ($column_name == 'edit_delete') {
            return '<a href="/wp-admin/?page=bsog_events_registrations_delete&event_registration_id=' . $item['id'] . '&event_id=' . $_GET['event_id'] . '">Delete</a> | <a href="/wp-admin/?page=bsog_events_registrations_update&event_registration_id=' . $item['id'] . '&event_id=' . $_GET['event_id'] . '">Edit</a>';
        } else {
            return $item[$column_name];
        }
    }

}

And outside the class there is function and calling prepare_method. COde is as follows

function additions() {

    global $wpdb;
    $order_by = "";
    $order = "";
    $event_id = $_GET['event_id'];
    //$msg = $_GET['msg'];
    if (isset($_GET['orderby'])) {
        $order_by = "ORDER BY " . $_GET['orderby'];
    }
    if (isset($_GET['order'])) {
        $order = $_GET['order'];
    }

    $event = get_post($event_id);
    $table_name_reg = $wpdb->prefix . 'events_registrations';
    $table_name_user = $wpdb->prefix . 'users';
    $query = "SELECT * FROM `$table_name_reg` AS reg JOIN `$table_name_user` AS u ON `reg`.`user_id` = u.`ID` WHERE `reg`.`event_id`=%d $order_by $order";
    $query = $wpdb->prepare($query, [$event_id]);
    $additions = $wpdb->get_results($query, 'ARRAY_A');
    $myListTable = new My_List_Table();
    $myListTable->prepare_items($additions);




    if ($wpdb->num_rows > 0) {
        $i = 1;
        include 'views/additions.php';
    } else {
        echo '<div class="wrap"><p>No followers</p></div>';
    }


    die(0);
}

What is the cause of this error and how can I resolve it?

Answer 1

You get the error because of the line of $myListTable->prepare_items($additions);. You pass $additions While your function is not supporting a parameter:

    public function prepare_items() {
        $columns = $this->get_columns();
        $hidden = array();
        $sortable = $this->get_sortable_columns();
        $this->_column_headers = array($columns, $hidden, $sortable);
        $this->items = $registrations;
    }

and the base function does not support a parameter either:

    public function prepare_items() {
        die( 'function WP_List_Table::prepare_items() must be overridden in a subclass.' );
    }

See https://github.com/WordPress/WordPress/blob/master/wp-admin/includes/class-wp-list-table.php

EDIT

I was asked in the comment section about a possible way to be able to use $additions inside prepare_items. Basically one can do something like this:

class My_Cutsom_Table extends WP_List_Table {
    //...
    //This will store the additions you initially wanted to pass
    protected $additions;
    //Setter for additions
    public function setAdditions($additions) {
        $this->additions = $additions; return $this;
    }
    //Getter for additions
    public function getAdditions() {
        return $this->additions;
    }
    //...
    public function prepare_items() {
        //Your code here, you can get the additions via $this->getAdditions()
    }
}

Usage:

    $myListTable = new My_List_Table();
    $myListTable->setAdditions($additions);
    $myListTable->prepare_items();