Trying to execute multiple queries on same function - php

Question

I am trying to execute 2 queries at the same time on the same function on my application. This function on the controller registers a new house in the system and at the same time, its suppose to feed a field in the Users table that has been null, and this field will then be updated with the new id of the house i have just created. For some reason, the first query works fine but i have been struggling with the second. I believe my logical is fine, maybe the Laravel syntax is making me a bit confused. Can someone help me?
This is my controller
<?php
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use App\House;
use App\User;
class AdminHouseController extends Controller
{
public function index(){
}
public function create($role_id){
if($role_id == 1){
return view('admin.house.create');
}else{
return redirect('home');
}
}
public function store(Request $request){
House::create($request->all());
$house_admin = Auth::user()->id;
$house = House::where('house_admin', $house_admin)->first();
User::findOrFail($house_admin)->update(['house_id' => $house->id]);
return redirect('home');
}
public function show($id){
}
public function edit($id){
}
public function update(Request $request, $id){
}
public function destroy($id){
}
}
This is my form
//i believe the problem is not here, but anyway
#extends('layouts.app')
#section('content')
<p><b>Register your house</b></p>
{!! Form::open(['method'=>'post', 'action'=>'AdminHouseController#store']) !!}
{!! Form::text('house_address', null,['placeholder'=>'House Address']) !!}
<input type="hidden" name="house_admin" value="{{Auth::user()->id}}">
{!! Form::number('nflatmates', null, ['placeholder'=>'How many flatmates']) !!}
{!! Form::submit('Register', ['class'=>'ui-btn buttonDefault']) !!}
{!! Form::close() !!}
#stop
And finnaly, this my router web.php
//i also believe the problem is not here, but in my controller
use App\User;
Route::get('/', function () {
return view('welcome');
});
Auth::routes();
Route::get('/home', 'HomeController#index')->name('home');
Route::get('/house/{role_id}', 'AdminHouseController#create')->name('house');
Route::post('store', [
'uses' => 'AdminHouseController#store'
]);

Answer 1

You need to add the house_id field to the $fillable array in the User model:
protected $fillable = ['house_id', 'other_fields'];
Also, you have two foreign keys instead of one which is redundant. You might want to keep only house_admin foreign key.