Total, Quantity, Price in Laravel - laravel

Question

I have a table named 'products' with 5 fields (id, title, price, quantity, total).
My goal is to calculate via the form products.create the total, price * quantity.
Database - products
public function up()
{
Schema::create('products', function (Blueprint $table) {
$table->bigIncrements('id');
$table->string('title');
$table->integer('quantity');
$table->double('price');
$table->double('total')->nullable();
$table->timestamps();
});
}
Model - product
protected $fillable = ['title', 'quantity', 'price', 'total'];
public function setTotalAttribute()
{
$this->total = $this->quantity * $this->price;
}
public function getTotalAttribute($value)
{
return $value;
}
** Controller - ProductController**
public function index()
{
$products = Product::oldest()->paginate(5);
return view('admin.products.index', compact('products'))
->with('i', (request()->input('page', 1)-1)*5);
}
public function create()
{
$products = Product::all();
return view('admin.products.create', compact('products'));
}
public function store(Request $request)
{
$request->validate([
'title' => 'required',
'quantity' => 'required',
'price' => 'required',
'total' => 'required'
]);
Product::create($request->all());
return redirect()->route('products.index')
->with('success', 'save');
}
My problem is in my view "products.create" I have 3 fields when I encode the 3 fields, nothing happens ???
Products.create
<form class="panel-body" action="{{route('products.store')}}" method="POST" novalidate>
#csrf
<fieldset class="form-group {{ $errors->has('title') ? 'has-error' : '' }}">
<label for="form-group-input-1">Title</label>
<input type="text" name="title" id="title" class="form-control" value="{{ old('title')}}"/>
{!! $errors->first('title', '<span class="help-block">:message</span>') !!}
</fieldset>
<fieldset class="form-group {{ $errors->has('quantity') ? 'has-error' : '' }}">
<label for="form-group-input-1">Quantity</label>
<input type="text" name="quantity" id="quantity" class="form-control" value="{{ old('quantity')}}"/>
{!! $errors->first('quantity', '<span class="help-block">:message</span>') !!}
</fieldset>
<fieldset class="form-group {{ $errors->has('price') ? 'has-error' : '' }}">
<label for="form-group-input-1">Price</label>
<input type="text" name="price" id="price" class="form-control" value="{{ old('price')}}"/>
{!! $errors->first('price', '<span class="help-block">:message</span>') !!}
</fieldset>
Back
<button type="submit" class="btn btn-sm btn-primary">Valider</button>
Thank you for help.

Answer 1

First of all you didn't send any total value...
$request->validate([
'title' => 'required',
'quantity' => 'required',
'price' => 'required',
]);
Just follow Eloquent ORM
$product = New Product();
$product-title = $request->title;
$product-quantity = $request->quantity;
$product-price = $request->price;
$product-total = $request->price * $request* quantity;
$product->save();
//redirect()

Answer 2

The mutator will receive the value that is being set on the attribute, so your mutator method should be like this on you Product model
public function setTotalAttribute()
{
$this->attributes['total'] = $this->quantity * $this->price;
}