jiqu-library-server/app/Admin/Controllers/ProductCategoryController.php

<?php

namespace App\Admin\Controllers;

use App\Admin\Repositories\ProductCategory;
use App\Exceptions\BizException;
use App\Models\ProductCategory as ProductCategoryModel;
use App\Models\ProductSpu;
use Carbon\Carbon;
use Dcat\Admin\Admin;
use Dcat\Admin\Form;
use Dcat\Admin\Grid;
use Dcat\Admin\Grid\Column;
use Dcat\Admin\Http\Controllers\AdminController;
use Dcat\Admin\Show;
use Illuminate\Http\Request;

class ProductCategoryController extends AdminController
{
    /**
     * Make a grid builder.
     *
     * @return Grid
     */
    protected function grid()
    {
        $builder = ProductCategory::with('parent');
        return Grid::make($builder, function (Grid $grid) {
            $grid->column('id')->sortable();
            $grid->column('name');
            $grid->column('icon')->image(50, 50);
            $grid->column('parent.name', '上级分类')->label();
            $grid->column('is_show')
                ->if(function () {
                    return Admin::user()->can('dcat.admin.product_categories.edit');
                })
                ->then(function (Column $column) {
                    $column->switch();
                })
                ->else(function (Column $column) {
                    $column->bool();
                });
            $grid->column('is_recommend')
                ->if(function () {
                    return Admin::user()->can('dcat.admin.product_categories.edit');
                })
                ->then(function (Column $column) {
                    $column->switch();
                })
                ->else(function (Column $column) {
                    $column->bool();
                });
            $grid->column('sort');
            $grid->column('created_at')->sortable();

            //排序
            $grid->model()->orderBy('created_at', 'desc');

            /** 操作 **/
            //新增
            if (Admin::user()->can('dcat.admin.product_categories.create')) {
                $grid->disableCreateButton(false);
                $grid->enableDialogCreate();
            }
            //修改
            $grid->showQuickEditButton(Admin::user()->can('dcat.admin.product_categories.edit'));
            //删除以及自定义操作
            $grid->actions(function (Grid\Displayers\Actions $actions) {
                $actions->disableDelete(Admin::user()->cannot('dcat.admin.product_categories.destroy'));
            });

            /** 查询 **/
            $grid->filter(function (Grid\Filter $filter) {
                $filter->panel();
                $filter->equal('name')->width(3);
                $filter->equal('parent_id', '上级分类')->select(ProductCategoryModel::selectOptions())->width(3);
            });
        });
    }

    /**
     * Make a show builder.
     *
     * @param mixed $id
     *
     * @return Show
     */
    protected function detail($id)
    {
        return Show::make($id, new ProductCategory(), function (Show $show) {
            $show->field('id');
            $show->field('name');
            $show->field('icon');
            $show->field('is_show');
            $show->field('sort');
            $show->field('parent_id');
            $show->field('created_at');
            $show->field('updated_at');
        });
    }

    /**
     * Make a form builder.
     *
     * @return Form
     */
    protected function form()
    {
        return Form::make(new ProductCategory(), function (Form $form) {
            $form->display('id');
            $form->select('parent_id')->options(ProductCategoryModel::selectOptions());
            $form->text('name')->required();
            $form->image('icon')
                    ->move('product-categories/'.Carbon::now()->toDateString())
                    ->saveFullUrl()
                    ->removable(false)
                    ->autoUpload()->retainable();
            $form->switch('is_show');
            $form->switch('is_recommend');
            $form->number('sort')->min(0)->default(0);
            $form->saving(function (Form $form) {
                //只能添加到三级分类
                if ($form->parent_id) {
                    $result = ProductCategoryModel::withDepth()->find($form->parent_id);
                    if ($result->depth >= 2) {
                        return $form->response()->error('不能创建四级以及以下的分类');
                    }
                }
            });

            $form->display('created_at');
            $form->display('updated_at');
        });
    }

    public function destroy($id)
    {
        //如果有子分类或者分类下有商品则不允许删除
        if (ProductCategoryModel::descendantsOf($id, ['id'])->count() > 0
            || ProductSpu::where('category_id', $id)->count() > 0) {
            throw new BizException(__('product-category.options.deny_message'));
        }
        return parent::destroy($id);
    }

    public function categories(Request $request)
    {
        $query = ProductCategoryModel::select('id', 'name as text');
        if ($request->filled('pid')) {
            $query->where('parent_id', $request->input('pid'));
        }
        if ($request->filled('level')) {
            $query->withDepth()->having('depth', '=', $request->input('level'));
        }
        $data = $query->get();
        return response()->json($data);
    }
}