7-3 app\Http\Controllers\CartController.php

<?php

namespace App\Http\Controllers;

use App\Cart;
use Illuminate\Http\Request;

class CartController extends Controller
{
    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index(Request $request)
    {
        $user = $request->user();
        return view('cart.index', compact('user'));
    }

    /**
     * Show the form for creating a new resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function create()
    {
        //
    }

    /**
     * Store a newly created resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    public function store(Request $request)
    {
        $cart             = new Cart;
        $cart->user_id    = $request->user()->id;
        $cart->product_id = $request->product_id;
        $cart->amount     = $request->amount;
        $cart->save();
        return [];
    }

    /**
     * Display the specified resource.
     *
     * @param  \App\Cart  $cart
     * @return \Illuminate\Http\Response
     */
    public function show(Cart $cart)
    {
        //
    }

    /**
     * Show the form for editing the specified resource.
     *
     * @param  \App\Cart  $cart
     * @return \Illuminate\Http\Response
     */
    public function edit(Cart $cart)
    {
        //
    }

    /**
     * Update the specified resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \App\Cart  $cart
     * @return \Illuminate\Http\Response
     */
    public function update(Request $request, Cart $cart)
    {
        //
    }

    /**
     * Remove the specified resource from storage.
     *
     * @param  \App\Cart  $cart
     * @return \Illuminate\Http\Response
     */
    public function destroy($id, Request $request)
    {
        $request->user()->carts()->where('id', $id)->delete();
        return [];
    }
}