hainan/app/AdminAgent/Controllers/MessageController.php

<?php

namespace App\AdminAgent\Controllers;

use App\AdminAgent\Renderable\SelectUser;
use App\AdminAgent\Repositories\Message;
use App\Models\User;
use Dcat\Admin\Admin;
use Dcat\Admin\Form;
use Dcat\Admin\Grid;
use Dcat\Admin\Show;
use Dcat\Admin\Http\Controllers\AdminController;

class MessageController extends AdminController
{
    /**
     * Make a grid builder.
     *
     * @return Grid
     */
    protected function grid()
    {
        return Grid::make(new Message(), function (Grid $grid) {
			$grid->model()->where('agent_id', Admin::user()->id);

            $grid->column('id')->sortable();
            $grid->column('user_id');
            $grid->column('title');
            $grid->column('is_read')->if(fn($v) => $this->user_id != 0)->bool()->else()->display('所有人接收');
            $grid->column('created_at');

            $grid->filter(function (Grid\Filter $filter) {
				$filter->panel();
				$filter->model()->where('agent_id', Admin::user()->id);

                $filter->equal('id');
				$filter->like('title');
            });
        });
    }

    /**
     * Make a show builder.
     *
     * @param mixed $id
     *
     * @return Show
     */
    protected function detail($id)
    {
        return Show::make($id, new Message(), function (Show $show) {
			//不允许查看非自己的数据
			if ($show->model()->agent_id != Admin::user()->id) {
				Admin::exit('数据不存在');
			}

			$show->field('id');
            $show->field('user_id');
            $show->field('title');
            $show->field('content')->unescape();
            $show->field('is_read')
				->as(function () {
					if ($this->user_id) {
						return $this->is_read ? '已读' : '未读';
					}
					return '所有人接收';
				});
            $show->field('created_at');
        });
    }

    /**
     * Make a form builder.
     *
     * @return Form
     */
    protected function form()
	{
		return Form::make(new Message(), function (Form $form) {
			//不允许查看非自己的数据
			if ($form->isEditing() && $form->model()->agent_id != Admin::user()->id) {
				return $form->response()->error('数据不存在');
			}

			$form->display('id');
			$form->selectTable('user_id')
				->from(new SelectUser())
				->model(User::class, 'id', 'nickname')
				->default(0)
				->help('不选择则表示所有人都收到消息');
			$form->text('title')->required();
			$form->editor('content');

			if ($form->isCreating()) {
				$form->confirm('发布确认', '为了保证消费者利益，所有人接收的消息发布后禁止编辑，确定发布？');
			}
		})->saving(function (Form $form) {
			//不允许修改非自己的数据
			if ($form->isEditing() && $form->model()->agent_id != Admin::user()->id) {
				return $form->response()->error('数据不存在');
			}

			//消息已读后禁止编辑
			if ($form->isEditing()) {
				if ($form->model()->user_id == 0) {
					return $form->response()->error('为了保证消费者利益，所有人接收的消息禁止编辑');
				}
				if ($form->model()->is_read) {
					return $form->response()->error('消息已读，禁止修改');
				}
			}

			//特殊字段处理
			$form->hidden(['agent_id']);
			$form->agent_id = Admin::user()->id;
			$form->user_id = $form->user_id ?? 0;

			//不允许编辑的字段
			$form->ignore(['id', 'status', 'created_at', 'updated_at', 'deleted_at']);
		})->deleting(function (Form $form) {
			//不允许删除非自己的数据
			if ($form->model()[0]['agent_id'] != Admin::user()->id) {
				return $form->response()->error('数据不存在');
			}
		});
	}
}