File properties/class-papi-property-reference.php

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<?php

/**
 * Property that shows which relationships that exists
 * between the current post and other posts.
 */
class Papi_Property_Reference extends Papi_Property {

    /**
     * Get default settings.
     *
     * @return array
     */
    public function get_default_settings() {
        return [
            'slug'      => [],
            'page_type' => []
        ];
    }

    /**
     * Render property html.
     */
    public function html() {
        $post_id  = papi_get_post_id();
        $settings = $this->get_settings();

        // Create query array for every page type.
        $page_types = array_map( function ( $page_type ) {
            return [
                'key'     => papi_get_page_type_key(),
                'value'   => $page_type,
                'compare' => 'LIKE'
            ];
        }, papi_to_array( $settings->page_type ) );

        // Add relation.
        $page_types['relation'] = 'OR';

        // Prepare arguments for WP_Query.
        $args = [
            'post_type'              => 'any',
            'no_found_rows'          => true,
            'update_post_meta_cache' => false,
            'update_post_term_cache' => false,
            'meta_query'             => $page_types
        ];

        $posts = ( new WP_Query( $args ) )->posts;

        $values = [];

        foreach ( papi_to_array( $settings->slug ) as $slug ) {
            foreach ( $posts as $post ) {
                $val = papi_get_field( $post->ID, $slug );

                $val = array_filter( papi_to_array( $val ), function ( $item ) use ( $post_id ) {
                    return is_object( $item ) && $item->ID === $post_id;
                } );

                if ( empty( $val ) ) {
                    continue;
                }

                $page_type = papi_get_entry_type_by_meta_id( $post->ID );

                if ( empty( $page_type ) ) {
                    continue;
                }

                // Create the array
                if ( ! isset( $values[$post->post_type] ) ) {
                    $values[$post->post_type] = [];
                }

                if ( ! isset( $values[$post->post_type][$page_type->name] ) ) {
                    $values[$post->post_type][$page_type->name] = [];
                }

                // Add the post
                if ( ! isset( $values[$post->post_type][$page_type->name][$post->ID] ) && ! empty( $val ) ) {
                    $values[$post->post_type][$page_type->name][$post->ID] = $post;
                }
            }
        }

        ?>
        <ul class="papi-property-reference" data-papi-rule="<?php echo $this->html_name(); ?>">
            <?php if ( empty( $values ) ): ?>
                <p>
                    <?php _e( 'No references exists', 'papi' ); ?>
                </p>
            <?php
            endif;
            ksort( $values ); foreach ( $values as $title => $val ):
                $post_type = get_post_type_object( $title );
                ?>
                <li>
                    <h3><?php echo $post_type->labels->name; ?></h3>
                    <div class="handlediv" title="Click to toggle"><br></div>
                </li>
                <li>
                    <div class="page-types">
                        <ul>
                            <?php ksort( $val ); foreach ( $val as $name => $posts ): ?>
                                <li class="heading-border">
                                    <h4><?php echo $name; ?></h4>
                                    <div class="handlediv" title="Click to toggle"><br></div>
                                </li>
                                <li>
                                    <div class="box">
                                        <?php $i = 0;
                                        foreach ( $posts as $post ): ?>
                                            <a href="<?php echo get_edit_post_link( $post->ID ); ?>"><?php echo $post->post_title; ?></a>
                                        <?php $i++;
                                        endforeach; ?>
                                        <div class="clear"></div>
                                    </div>
                                </li>
                            <?php endforeach; ?>
                        </ul>
                        <div class="clear"></div>
                    </div>
                </li>
            <?php endforeach; ?>
        </ul>
        <?php
    }
}

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Functions