tes

    private function get_posts_ids_by( $key, $value, $default = false )
    {
        $posts_ids = [];

        $user_id = get_current_user_id();

        $query = Capsule::table(self::table())
                    ->select(self::table().'.ID')
                    ->where(self::table().'.post_type','soal')
                    ->where(self::table().'.post_status','publish');

        if ( false === $default ) :

            if ( 'test' === $key ) :

                $posts_ids_cache = get_transient( 'default_'.$user_id.'_posts_ids' );
                if ( false !== $posts_ids_cache && is_array( $posts_ids_cache ) ) :
                    $query->whereIn( self::table().'.ID', $posts_ids_cache );
                endif;

            else :

                switch ( $key ) {
                    case 'subject':
                        $k = 'test';
                        break;
                    case 'year-test':
                        $k = 'subject';
                        break;
                    case 'type':
                        $k = 'year-test';
                        break;
                    case 'difficulty':
                        $k = 'type';
                        break;
                    case 'keyword':
                        $k = 'difficulty';
                        break;
                    default:
                        $k = '';
                        break;
                }

                $posts_ids_cache = get_transient( $k.'_'.$user_id.'_posts_ids' );
                if ( false !== $posts_ids_cache && is_array( $posts_ids_cache ) ) :
                    $query->whereIn( self::table().'.ID', $posts_ids_cache );
                endif;

            endif;

        endif;

        if ( !empty( $value ) ) :
            if ( 'type' === $key ) :
                $query->join(self::table('postmeta'), self::table().'.ID', '=', self::table('postmeta').'.post_id')
                        ->where(self::table('postmeta').'.meta_key','_type')
                        ->where(self::table('postmeta').'.meta_value',$value);
            else:
                $query->join(self::table('term_relationships'), self::table().'.ID', '=', self::table('term_relationships').'.object_id')
                        ->join(self::table('term_taxonomy'), self::table('term_relationships').'.term_taxonomy_id', '=', self::table('term_taxonomy').'.term_taxonomy_id')
                        // ->join(self::table('terms'), self::table('term_taxonomy').'.term_id', '=', self::table('terms').'.term_id')
                        ->where(self::table('term_taxonomy').'.taxonomy', $key)
                        ->whereIn(self::table('term_taxonomy').'.term_id', $value);
            endif;
        endif;
        
        $data = $query->get()->toArray();

        if ( !empty( $data ) ) :
            foreach ( $data as $k => $v ) :
                $posts_ids[] = $v->ID;
            endforeach;

            if ( false === $default ) :
                set_transient( $key.'_'.$user_id.'_posts_ids', $posts_ids, 12 * HOUR_IN_SECONDS );
            endif;

        endif;

        return $posts_ids;
    }