Question

这是代码

 public function getSubCategory(Request $request)

{

    $response = array();
    try {
        $categories = Category::where(['status' => 0, 'parent_id' => 0])- >get();
        $subCategory = Category::where('status', 0)->where('parent_id', '!=', 0)->get();

        foreach ($subCategory as $sub) {

            $categoryTitle = Category::where(['id' => $sub->parent_id])- >get(['title']);


            $result[] = array(

                'cat_title' => $categoryTitle[0]->title,
                'sub_title' => $sub->title,

            );
        }
            if (count($result) > 0) {
                $response = (new ApiMessageController())->successResponse($result, "Categories List Found!");
            } else {
                $response = (new ApiMessageController())->failedresponse("No Categories List Found");
            }
    } catch (\Illuminate\Database\QueryException $ex) {
        $response = (new ApiMessageController())->queryexception($ex);
    }
    return $response;
}

我想显示父类别及其下的子类别。像这样：

类别

Sub 1

Sub 2



类别

Sub 1

Sub 2

我想显示类似see demo

的数据

数据库结构。类别和子类别都在同一表中。 Database

Answer 1

我建议您使用NestedSet。因此，您可以创建类别树并按深度获取所有数据。

但是在使用它之前，您需要了解

使用树形结构非常舒适。（+）
无递归选择（+）
您可能有一个单独的标准化表格（+）
请求（-）可能会很长

您可以看到所有的here详细信息

Answer 2

试试这个::

this

输出：

public function getSubCategory(Request $request)
{
    $response = array();
    try {
        $allData = array();
        // get all parent category 
        $categories = Category::where(['status' => 0, 'parent_id' => 0])->get();        
        foreach ($categories as $key=>$sub) {
            // now take one by one it's child category 
            $subCategory = Category::where('status', 0)->where('parent_id', '=', $sub->id)->get();
            $subCat = array();
            // set parent category title
            $allData[$key]['parent'] = $sub->title;
            foreach ($subCategory as $k=>$subcat) {
                $subCat[$subcat->id] = $subcat->title
            }
            // set child category array
            $allData[$key]['child'] = $subCat;
        }

        if (count($allData) > 0) {
            $response = (new ApiMessageController())->successResponse($allData, "Categories List Found!");
        } else {
            $response = (new ApiMessageController())->failedresponse("No Categories List Found");
        }
    } catch (\Illuminate\Database\QueryException $ex) {
        $response = (new ApiMessageController())->queryexception($ex);
    }
    return $response;
}

也许这会对您有所帮助。

Answer 3

这就是我将继续的方式：

首先我将获得所有类别
然后我将获得每个类别的所有子类别
我将其添加到表格中
最后我将退回桌子。

这是我的代码的样子：

public function getSubCategory(Request $request){

    $response = array();
    try {
        $categories = Category::where(['status' => 0, 'parent_id' => 0])- >get();
        foreach ($categories as $c) {
            $subcategories = Category::where("parent_id", $c->id)->get();
            $response[] = [$c, $subcategories];
        }

        if (count($response) > 0) {
            $response = (new ApiMessageController())->successResponse($result, "Categories List Found!");
        } else {
            $response = (new ApiMessageController())->failedresponse("No Categories List Found");
        }
    } catch (\Illuminate\Database\QueryException $ex) {
        $response = (new ApiMessageController())->queryexception($ex);
    }
    return $response;
}

希望我的助手帮忙！

如何显示类别中的子类别？

3 个答案: