<?php
add_action( 'mb_relationships_init', 'ec_block1' );

function ec_block1() {
    MB_Relationships_API::register( [
        'id'   => 'event-to-course-relationship',
        'from' => [
            'object_type'   => 'post',
            'post_type'     => 'events',
            'empty_message' => 'Choose an event',
            'field'         => [
                'name'       => 'From Events to Courses',
                'query_args' => [
                    '0p3oe36ob0b' => [
                        'id'    => '0p3oe36ob0b',
                        'key'   => 'taxonomy',
                        'value' => 'post_tag',
                    ],
                    '8yfo25qwixm' => [
                        'id'    => '8yfo25qwixm',
                        'key'   => 'terms',
                        'value' => '2022',
                    ],
                    'yze1cekjc0r' => [
                        'id'    => 'yze1cekjc0r',
                        'key'   => 'taxonomy',
                        'value' => 'event-category',
                    ],
                    'hesfz0dkrnt' => [
                        'id'    => 'hesfz0dkrnt',
                        'key'   => 'terms',
                        'value' => 'qualitative-research-summer-intensive',
                    ],
                ],
            ],
        ],
        'to'   => [
            'object_type'   => 'post',
            'post_type'     => 'course',
            'empty_message' => 'Choose a course',
            'field'         => [
                'name' => 'To Course from Events',
            ],
        ],
    ] );
}