模型树实操

很多时候，数据都是有层级和分类的，使用laravel的Dcat框架，可以快速搭建一个结构清晰、且可以鼠标拖拽排序的后台；先上例子更直观：
在这里插入图片描述
这里是Dcat的模型树使用文档，戳一下；

重点注意事项有：

1、数据库表的parent_id字段一定要默认为0，
2、数据库表parent_id、order、title一定要有，不过这三个字段支持修改，可在Model中进行修改；其它字段没有要求

<?php

namespace App\Models\Demo;

use Dcat\Admin\Traits\ModelTree;
use Illuminate\Database\Eloquent\Model;

class Category extends Model
{
    use ModelTree;

    protected $table = 'demo_categories';

    // 父级ID字段名称，默认值为 parent_id
    protected $parentColumn = 'pid';

    // 排序字段名称，默认值为 order
    protected $orderColumn = 'sort';

    // 标题字段名称，默认值为 title
    protected $titleColumn = 'name';

    // Since v2.1.6-beta，定义depthColumn属性后，将会在数据表保存当前行的层级
    protected $depthColumn = 'depth';
}

tree的使用

去 Dcat 后台用代码生成工具生成 Controller 文件，生成以后直接用我下面的代码覆盖：

<?php

namespace App\Admin\Controllers\SecondPhase;

use App\Models\CancerDetectionMethods;
use App\Models\CancerDetectionSamples;
use App\Models\CancerRecommendSearch;
use App\Models\CancerSiteInfo;
use App\Models\CancerSiteMethods;
use App\Models\CancerTargets;
use App\Models\LsDicLabel;
use App\Services\CancerTargetTreesService;
use Dcat\Admin\Form;
use Dcat\Admin\Grid;
use Dcat\Admin\Http\Controllers\AdminController;
use Dcat\Admin\Layout\Column;
use Dcat\Admin\Layout\Content;
use Dcat\Admin\Layout\Row;
use Dcat\Admin\Tree;
use Dcat\Admin\Widgets\Box;
use Dcat\Admin\Widgets\Form as WidgetForm;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\DB;

class CancerTargetsController extends AdminController
{
    public function index(Content $content)
    {
        return $content
            ->title('模型树')
            ->body(function (Row $row) {
                $row->column(6, $this->treeView()->render());

                $row->column(6, function (Column $column) {
                    $form = new WidgetForm();
                    $form->action(admin_url('cancer-target-tree'));

                    $form->select('parent_id', '父级')->options(CancerTargets::selectOptions());
                    $form->text('title', '名称')->required();

                    $column->append(Box::make('新增', $form));
                });
            });
    }

    protected function treeView()
    {
        return new Tree(new CancerTargets(), function (Tree $tree) {
            $tree->disableCreateButton();
            $tree->disableQuickCreateButton();
            $tree->disableEditButton();
            $tree->maxDepth(4);

            $tree->branch(function ($branch) {
                $payload = $branch['id'].' - '.$branch['title'];

                if ($branch['level'] === 4) {
                    $url     = admin_url('/cancer-site/'.$branch['id'].'/edit');
                    $payload .= <<<HTML
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<a href="$url" class="dd-nodrag">位点管理</a>
HTML;
                }

                return $payload;
            });
        });
    }

    protected function form()
    {
        return Form::make(new CancerTargets(), function (Form $form) {

            $form->model()->with([
                'methods:id, name',
            ]);

            $form->display('id');
            $form->select('parent_id', '父级')
                ->options(CancerTargets::selectOptions())
                ->saving(function ($v) {
                    return (int)$v;
                });
            $form->text('title', '名称')->required();
            $form->hidden('level', '等级');

            $form->disableViewButton();
            $form->footer(function ($footer) {

                // 去掉`重置`按钮
                $footer->disableReset();

                // 去掉`查看`checkbox
                $footer->disableViewCheck();

                // 去掉`继续编辑`checkbox
                $footer->disableEditingCheck();

                // 去掉`继续创建`checkbox
                $footer->disableCreatingCheck();

                // 设置`查看`默认选中
                $footer->defaultViewChecked();

                // 设置`继续编辑`默认选中
                $footer->defaultEditingChecked();

                // 设置`继续创建`默认选中
                $footer->defaultCreatingChecked();
            });
          
        });
    }

}