fastadmin 编辑下的关联查询具体实现方式，

首先把后台控制器的编辑方法复制到当前控制器，

并修改查询方法关联上关联表：

/**
 * 编辑
 */
public function edit($ids = null)
{
    //$row = $this->model->get($ids);
    //改成关联查询，对应的在模版调用就是$row.表名.字段名
    $row = $this->model->get($ids,['carbrand']);
    if (!$row) {
        $this->error(__('No Results were found'));
    }
    $adminIds = $this->getDataLimitAdminIds();
    if (is_array($adminIds)) {
        if (!in_array($row[$this->dataLimitField], $adminIds)) {
            $this->error(__('You have no permission'));
        }
    }
    if ($this->request->isPost()) {
        $params = $this->request->post("row/a");
        if ($params) {
            $params = $this->preExcludeFields($params);
            $result = false;
            Db::startTrans();
            try {
                //是否采用模型验证
                if ($this->modelValidate) {
                    $name = str_replace("\\model\\", "\\validate\\", get_class($this->model));
                    $validate = is_bool($this->modelValidate) ? ($this->modelSceneValidate ? $name . '.edit' : $name) : $this->modelValidate;
                    $row->validateFailException(true)->validate($validate);
                }
                $result = $row->allowField(true)->save($params);
                Db::commit();
            } catch (ValidateException $e) {
                Db::rollback();
                $this->error($e->getMessage());
            } catch (PDOException $e) {
                Db::rollback();
                $this->error($e->getMessage());
            } catch (Exception $e) {
                Db::rollback();
                $this->error($e->getMessage());
            }
            if ($result !== false) {
                $this->success();
            } else {
                $this->error(__('No rows were updated'));
            }
        }
        $this->error(__('Parameter %s can not be empty', ''));
    }
    $this->view->assign("row", $row);
    return $this->view->fetch();
}

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