然后可以这样使用：
$list = collection($list)->toArray();
$list = addtion($list, ['ktmingdan.kt_banji_id']);
在js中可以使用ktmingdan.kt_banji_name，获得关联名单表中的班级名称

文件位于：application/common.php`
/**

 * 附加关联字段数据 * @param array $items  数据列表 * @param mixed $fields 渲染的来源字段 * <a href="https://ask.fastadmin.net/u/20697" data-type="user" data-id="20697" data-toggle="popover" data-title="Return">@return</a> array */function addtion($items, $fields){    if (!$items || !$fields) {        return $items;    }    $fieldsArr = [];    if (!is_array($fields)) {        $arr = explode(',', $fields);        foreach ($arr as $k => $v) {            $fieldsArr[$v] = ['field' => $v];        }    } else {        foreach ($fields as $k => $v) {            if (is_array($v)) {                $v['field'] = isset($v['field']) ? $v['field'] : $k;            } else {                $v = ['field' => $v];            }            $fieldsArr[$v['field']] = $v;        }    }    foreach ($fieldsArr as $k => &$v) {        $v = is_array($v) ? $v : ['field' => $v];        $v['display'] = isset($v['display']) ? $v['display'] : str_replace(['_ids', '_id'], ['_names', '_name'], $v['field']);        $v['primary'] = isset($v['primary']) ? $v['primary'] : '';        $v['column'] = isset($v['column']) ? $v['column'] : 'name';        $v['model'] = isset($v['model']) ? $v['model'] : '';        $v['table'] = isset($v['table']) ? $v['table'] : '';        $v['name'] = isset($v['name']) ? $v['name'] : str_replace(['_ids', '_id'], '', $v['field']);    }    unset($v);    $ids = [];    $fields = array_keys($fieldsArr);    foreach ($items as $k => $v) {        foreach ($fields as $m => $n) {            if (isset($v[$n])) {                $ids[$n] = array_merge(isset($ids[$n]) && is_array($ids[$n]) ? $ids[$n] : [], explode(',', $v[$n]));            }elseif (strpos($n, '.')) {                list($model_rel, $model_field) = explode('.', $n);                $ids[$n] = array_merge(isset($ids[$n]) && is_array($ids[$n]) ? $ids[$n] : [], explode(',', $v[$model_rel][$model_field]));            }        }    }    $result = [];    foreach ($fieldsArr as $k => $v) {        if ($v['model']) {            $model = new $v['model'];        } else {            if (strpos($v['name'], '.')) {                list($model_rel, $model_table) = explode('.', $v['name']);                $model = $model_table ? thinkDb::name($model_table) : thinkDb::table($v['table']);            }else{                $model = $v['name'] ? thinkDb::name($v['name']) : thinkDb::table($v['table']);            }        }        $primary = $v['primary'] ? $v['primary'] : $model->getPk();        $result[$v['field']] = $model->where($primary, 'in', $ids[$v['field']])->column("{$primary},{$v['column']}");    }    foreach ($items as $k => &$v) {        foreach ($fields as $m => $n) {            if (isset($v[$n])) {                $curr = array_flip(explode(',', $v[$n]));                $v[$fieldsArr[$n]['display']] = implode(',', array_intersect_key($result[$n], $curr));            }elseif (strpos($n, '.')) {                list($model_rel, $model_field) = explode('.', $n);                $curr = array_flip(explode(',', $v[$model_rel][$model_field]));                list($model_rel, $model_display) = explode('.', $fieldsArr[$n]['display']);                $v[$model_rel][$model_display] = implode(',', array_intersect_key($result[$n], $curr));            }        }    }    return $items;}`

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