选择从user_id到user_id的消息

Question

I'm trying to make really simple function user to be able to message to admin only and admin to answer on this message.

So far I've made table message with following columns

id | from_id | to_id | subject | message 

In the controller I have this which should select all messages which are sent to current logged in user ( not sure if is correct )

public function index(){
        //$messages = Message::latest()->get();
    $currentUser = Auth::user()->id;
    $messages = Message::
        whereRaw('message.id = (select max(id) from `message` m2 where m2.to_id = '.$currentUser.')' )
        ->orderBy('id', 'desc')
        ->get();        
    return view('test.index', compact('messages'));
}

Now I'm trying to make viewMessage function

In index blade this is the link to single message

{!! link_to('test/view/' . $message->from_id, $message->subject) !!}

My Route

Route::get('test/view/{id}', 'MessageController@messageView')->name('test.view');

And controller function

public function messageView($id) {

    $user = User::where('id', $id)->first();

    $messages = $user->messages()->orderBy('created_at', 'asc')->get();
    return View::make('test.view', compact('messages'));
}

When I click on the button I got this error

SQLSTATE[42S22]: Column not found: 1054 Unknown column 'message.user_id' in 'where clause' (SQL: select * from message where message . user_id = 4 and message . user_id is not null order by created_at asc)

In User model I've added relation to message like:

public function messages() {
    return $this->hasMany('App\Message');
}

And in Message model

public function user(){ 
    return $this->belongsTo('App\User');
}

My question why in the query is looking for user_id when on my button I send from_id and how to fix this?

Answer 1

Why in the query is looking for user_id

You need to add foreign key and ID to the relationship to fix the error, for example:

public function messages() {
    return $this->hasMany('App\Message', 'from_id', 'id');
}