When called the update method, the Laravel does not recognize the route

Question

I’m beginner with Laravel(5.5) and I have a problem. I created a crud of products, can list it and view the record, but when I try to do an update, it returns an error:

Methodnotallowedhttpexception

BLADE:

@extends('base')
@section('main')
<div class="row">
    <div class="col-sm-8 offset-sm-2">
        <h1 class="display-3">Update a product</h1>

        @if ($errors->any())
        <div class="alert alert-danger">
            <ul>
                @foreach ($errors->all() as $error)
                <li>{{ $error }}</li>
                @endforeach
            </ul>
        </div>
        <br />
        @endif
        <form method="post" action="{{ route('products.update', $product->id) }}">
            @method('PATCH')
            @csrf
            <div class="form-group">
                <label for="name">Name:</label>
                <input type="text" class="form-control" name="name" value={{ $product->name }} />
            </div>

            <div class="form-group">

                <label for="description">Description:</label>
                <input type="text" class="form-control" name="description" value={{ $product->description }} />
            </div>


            <div class="form-group">
                <label for="quantity">Quantity:</label>
                <input type="text" class="form-control" name="quantity" value={{ $product->quantity }} />
            </div>

            <div class="form-group">
                <label for="price">Price:</label>
                <input type="text" class="form-control" name="price" value={{ $product->price }} />
            </div>

            <button type="submit" class="btn btn-primary">Update</button>
        </form>
    </div>
</div>
@endsection

CONTOLLER:

<?php

namespace App\Http\Controllers;

use App\Http\Requests\ProductRequest;
use App\Product;

class ProductController extends Controller
{
    public function index()
    {
        $products = Product::orderBy('created_at', 'desc')->paginate(10);
        return view('products.index',['products' => $products]);
    }

    public function create()
    {
        return view('products.create');
    }

    public function store(ProductRequest $request)
    {
        $product = new Product;
        $product->name        = $request->name;
        $product->description = $request->description;
        $product->quantity    = $request->quantity;
        $product->price       = $request->price;
        $product->save();
        return redirect()->route('products.index')->with('message', 'Product created successfully!');
    }

    public function show($id)
    {
        //
    }

    public function edit($id)
    {
        $product = Product::findOrFail($id);
        return view('products.edit',compact('product'));
    }

    public function update(ProductRequest $request, $id)
    {
        $product = Product::findOrFail($id);
        $product->name        = $request->name;
        $product->description = $request->description;
        $product->quantity    = $request->quantity;
        $product->price       = $request->price;
        $product->save();
        return redirect()->route('products.index')->with('message', 'Product updated successfully!');
    }

    public function destroy($id)
    {
        $product = Product::findOrFail($id);
        $product->delete();
        return redirect()->route('products.index')->with('alert-success','Product hasbeen deleted!');
    }
}

ROUTES

<?php
Route::get('/', function () {
    return view('welcome');
});

// Route::resource('products', 'ProductController')->middleware('auth');
Route::resource('products', 'ProductController');

Answer 1

Operation of the Laravel Cruds

The exception "Methodnotallowedhttpexception" is triggered when an invocation is made for a path whose method (POST, GET, PUT/PATH, DELETE) has not been specified correctly.

For example, suppose you declare a route like this:

Route::get('products', 'ProductController');

If you invoke her with form method="post" action="{{ route('products') }}", the exception will be fired as there is no route POST for "products".

Your problem

According to the documentation of Laravel 5.5, it is necessary to use PATCH or PUT to invoke a ". update" route in a CRUD.

For this to be done, there are two ways:

1. Create a field in the form input type="Hidden" name="_method" value="PATCH";
2. Use a helper for this, in case {{ method_field('PATCH') }}.

The problem is that you are using the @method('PATCH') Blade directive.

But the @method directive is only available on Laravel 5.6 or higher.

Since your version is 5.5, then you should use the helper {{ method_field('PATCH') }} in place.

<form method="post" action="{{ route('products.update', $product->id) }}">

    {{ method_field('PATCH') }}
    
    @csrf
    
    <div class="form-group">
        <label for="name">Name:</label>
        <input type="text" class="form-control" name="name" value={{ $product->name }} />
    </div>
    
    ....