File Type/Theme/Connection/ThemeConnectionResolver.php

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<?php
namespace WPGraphQL\Type\Theme\Connection;

use GraphQL\Type\Definition\ResolveInfo;
use GraphQLRelay\Relay;
use WPGraphQL\AppContext;

/**
 * Class ThemeConnectionResolver
 *
 * @package WPGraphQL\Data\Resolvers
 * @since 0.5.0
 */
class ThemeConnectionResolver {

    /**
     * Creates the connection for themes
     *
     * @param mixed       $source  The query results of the query calling this relation
     * @param array       $args    Query arguments
     * @param AppContext  $context The AppContext object
     * @param ResolveInfo $info    The ResolveInfo object
     *
     * @since  0.5.0
     * @return array
     * @access public
     */
    public static function resolve( $source, array $args, AppContext $context, ResolveInfo $info ) {
        $themes_array = [];
        $themes = wp_get_themes();
        if ( is_array( $themes ) && ! empty( $themes ) ) {
            foreach ( $themes as $theme ) {
                $themes_array[] = $theme;
            }
        }

        $connection = Relay::connectionFromArray( $themes_array, $args );

        $nodes = [];
        if ( ! empty( $connection['edges'] ) && is_array( $connection['edges'] ) ) {
            foreach ( $connection['edges'] as $edge ) {
                $nodes[] = ! empty( $edge['node'] ) ? $edge['node'] : null;
            }
        }

        $connection['nodes'] = ! empty( $nodes ) ? $nodes : null;

        return ! empty( $themes_array ) ? $connection : null;
    }

}

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