I am trying to add rating to a user and running in to error Call to a member function Review() on null. in laravel 5.8 - laravel

Question

i am trying to add rating and reviews to the user here is so far what i have done
i have made a separate controller for review
and in the store method of that controller my code is as follow
public function store(Request $request,User $user)
{
//
$up=User::find($user->id);
if($request->review)
{
$up->Review()->attach($request->review);
}
if($request->rating)
{
$up->Review()->attach($request->rating);
}
return redirect()->back();
}
i have created a seprate model for the review as well in which my code is looks like this
class Review extends Model
{
//
protected $fillable=['rating','review'];
Public function User()
{
return $this->belongsToMany(User::class);
}
}
where in my user model i have made this
Public function Review()
{
return $this->belongsToMany(Review::class);
}
where as my migrations looks like this
public function up()
{
Schema::create('review_user', function (Blueprint $table) {
$table->bigIncrements('id');
$table->integer('user_id');
$table->string('rating');
$table->string('review');
$table->timestamps();
});
}
my forms looks like this
<form action="{{route('ReviewsUser',$user->id)}}" method="POST">
#csrf
#method('PUT')
<div class="feedback-yes-no">
<strong>Your Rating</strong>
<div class="leave-rating">
<input type="radio" name="rating" id="rating-1" value="1" checked/>
<label for="rating-1" class="icon-material-outline-star"></label>
<input type="radio" name="rating" id="rating-2" value="2"/>
<label for="rating-2" class="icon-material-outline-star"></label>
<input type="radio" name="rating" id="rating-3" value="3"/>
<label for="rating-3" class="icon-material-outline-star"></label>
<input type="radio" name="rating" id="rating-4" value="4"/>
<label for="rating-4" class="icon-material-outline-star"></label>
<input type="radio" name="rating" id="rating-5" value="5"/>
<label for="rating-5" class="icon-material-outline-star"></label>
</div><div class="clearfix"></div>
</div>
<textarea class="with-border" placeholder="Enter Your Comments" name="review" id="review" cols="7" required></textarea>
<!-- Button -->
<button class="button full-width button-sliding-icon ripple-effect" type="submit" >Your Review's <i class="icon-material-outline-arrow-right-alt"></i></button>
</form>
what i am trying to do is to store reviews that other users have given the user anyone who can help me overcome this error would be highly appreciated .

Answer 1

Call to a member function Review() on null
This error means that your variable $up calling the member function Review() has a null value. Which means it's not finding your user in
$up = User::find($user->id);
Your post route doesn't have a route parameter to pass the user ID to find the user in the first place.
Therefore, changing this
Route::post('Reviews','ReviewsController#store')->name('ReviewsUser');
to this
Route::post('Reviews/{user}','ReviewsController#store')->name('ReviewsUser');
will now capture the User ID in your controller via User $user