SQLSTATE [23000]：完整性约束违规：1052. Laravel eloquent 连接表时出现问题

Question

我有 News 表，并且刀片表中posted by的列是空的，但在我的新闻表中，发布者的列users_id具有users_id值。 我无法获取在特定学校发布特定新闻的用户。 我已经对新闻进行了有效查询，但问题是我无法加入发布新闻的用户name所在的users表。 有人可以知道我的查询有什么问题吗？ 帮助将不胜感激。 谢谢

索引 controller

public function index()
    {
        //testing query that returns an error
        $userschool = Newsboard::select('users.name', 'news.school_id')
                        ->join('users', 'users.id', '=', 'news.users_id')
                        ->where('school_id', Auth::user()->school_id)->get();


         //the query that i want still returns an error because of the auth
        $postedby = DB::select(
            "SELECT news.*, users.name as postedby from news
            JOIN users on news.users_id = users.id
            WHERE news.school_id AND news.active = 1 AND news.school_id = 'Auth::user()->school_id'");


       //working queries and i dont know how to convert the $postedby query join to eloquent.
        if (Auth::user()->role == 0) {
            $news = Newsboard::where('active','=',1)->get();

        } elseif (Auth::user()->role == 1 || Auth::user()->role == 5) {

            $news = Newsboard::where('school_id', '=', Auth::user()->school_id ) 
                ->where('active','=',1)
                ->get();

        } else {
            $role = Auth::user()->role;
            $news = Newsboard::where('school_id', '=', Auth::user()->school_id  )
                ->where('status', '=', 1)
                ->where('active','=',1)
                ->whereRaw("group_id in('$role', '0')")
                ->get();

        }
        dd($userschool);

        return view('admin.pages.news.index', [
            'page_title' => $this->page_title,
            'news' => $news,
            'mnuname' => 'News',

        ]);

    }

Answer 1

因为users和news表都包含school_id列，所以 where 条件中必须有table前缀。

请试试：

$userschool = Newsboard::select('users.name', 'news.school_id')
    ->join('users', 'users.id', '=', 'news.users_id')
    ->where('news.school_id', Auth::user()->school_id)->get();

//or 

//the query that i want still returns an error because of the auth
$postedby = DB::select("SELECT news.*, users.name as postedby from news
    JOIN users on news.users_id = users.id
    WHERE news.school_id AND news.active = 1 AND news.school_id = '".Auth::user()->school_id."'");

Answer 2

将您的 Auth::user()->school_id 设置为变量

$school_id = Auth::user()->school_id;

//the query that i want still returns an error because of the auth
$postedby = DB::select(
            "SELECT news.*, users.name as postedby from news
             JOIN users on news.users_id = users.id
             WHERE news.school_id AND news.active = 1 AND news.school_id = '$school_id'");

或这个：

Newsboard::select('users.name', 'news.school_id')
    ->join('users', 'users.id', '=', 'news.users_id')
    ->where(['news.school_id' => $school_id])->get();

Answer 3

$school_id = Auth::user()->school_id; 

$userschool = Newsboard::select('users.name', 'news.school_id')
                        ->join('users', 'users.id', '=', 'news.users_id')
                        ->where('school_id', $school_id)->get();