在 Laravel Lumen 中迭代连接的查询数据

Question

类别和课程是两个表。基于类别，可以将“n”个数据插入到课程中。获取 API 响应时，应该如下所示。

控制器

public function catlist($catid)
{
    $category = 
    DB::table('courses')
    ->join('categories', 'courses.category_id', '=', 'categories.id')// joining the Categories table , where category_id and categories id are same
    ->select(
    'categories.id as catid',
    'categories.name as catname',
    'courses.id as courseid',
    'courses.title as coursename'
    )
    ->where('courses.category_id', '=', $catid)
    ->get();

    foreach ($category as $cat) 
    {
        $data = [
            'category'=>[
                "id" => $cat->catid,
                "name" => $cat->catname,
                ],
            'courselist'=>[
                "id" => $cat->courseid,
                "name" => $cat->coursename,
            ]
        ];
    }
    return response()->json([
        'success' => true,
        'data' => $data,
    ],200);
} 

实际结果是：

  "data": {
    "category": {
        "id": 1,
        "name": "Test Category"
    },

    "courseList": {
        "id": 2,
        "title": "Course 2"
    }
}

预期结果将是：

data=[
    category: {
      id: 1,
      name: "Test Category"
      },

      courseList: [
      {
        id: 1,
        title: "Course 1",
      },
      {
        id: 2,
        title: "Course 2",
      },
    ],
]

Answer 1

您的查询为每个课程和类别返回一行，您应该使用正常的 Laravel 关系，或者您需要在查询中使用 sql groupBycategories.id 方法。

https://laravel.com/docs/11.x/eloquent-relationships