ユーザー情報の更新処理（Laravel）

##前提、実現したい事
<環境>
OS : macOS Big Sur 11.4
MAMP
Laravel : 6.2

<実現したい事>
登録したユーザーの更新処理を行いたい

##発生している問題

##ソースコード

php
1Route::prefix('users')->name('users.')->group(function() {
2    Route::get('/list','UserController@list')->name('list');
3    Route::get('/edit/{producer_name}', 'UserController@getEdit')->name('edit')->middleware('auth');
4    Route::post('/edit/{producer_name}', 'UserController@postEdit')->name('postEdit')->middleware('auth');
5    Route::get('/{producer_name}','UserController@show')->name('show')->middleware('auth');
6});

php
1//マイページ更新画面表示
2    public function getEdit(string $producer_name)
3    {
4        $user = User::where('producer_name', $producer_name)->first();
5
6        return view('users.edit', [
7            'user' => $user,
8        ]);
9    }
10
11    //マイページ更新処理
12    public function postEdit($producer_name, Request $request)
13    {
14        $producer_name->fill($request->all())->save();
15        return redirect()->route('users.edit', ['producer_name' => $producer_name]);
16
17    }

php
1@extends('app')
2
3@section('title', '生産者ユーザー登録')
4
5@section('content')
6@include('nav')
7
8    <div>
9        <h1 class="text-center mt-100">生産者情報更新ページ</h1>
10    </div>
11    <div class="card mw-1000 center mt-5">
12        <div class="card-body text-center">
13            <h2 class="card-title text-center">ユーザー登録更新</h2>
14            @include('error_card_list')
15            <div class="card-text">
16                <form method="POST" action="{{ route('users.postEdit', ['producer_name' => $user->producer_name]) }}" enctype="multipart/form-data">
17                    @csrf
18                    <div class="md-form">
19                        <label for="producer_name">生産者名</label>
20                        <input class="form-control" type="text" id="producer_name" name="producer_name" required
21                            value="{{ $user->producer_name }}">
22                    </div>
23                    <div class="md-form">
24                        <label for="name">担当者名</label>
25                        <input class="form-control" type="text" id="name" name="name" required value="{{ $user->name }}">
26                    </div>
27                    <div class="md-form">
28                        <label for="introduction"></label>
29                        <textarea name="introduction" id="introduction" required class="form-control" rows="16"
30                            placeholder="紹介文">{{ $user->introduction }}</textarea>
31                    </div>
32
33                    <div class="md-form">
34                        <label for="address">住所</label>
35                        <input class="form-control" type="text" id="address" name="address" required
36                            value="{{ $user->address }}">
37                    </div>
38
39                    <div class="md-form">
40                        <label for="email">メール</label>
41                        <input class="form-control" type="text" id="email" name="email" required
42                            value="{{ $user->email }}">
43                    </div>
44                    <div class="md-form">
45                        <label for="password">パスワード</label>
46                        <input class="form-control" type="password" id="password" name="password" required>
47                    </div>
48
49                    <div class="introduction_image">
50                        <label class="form-label" for="image">紹介画像</label>
51                        <input class="form-control-file" type="file" id="image" name="image">
52                    </div>
53
54                    <button class="btn btn-block btn-outline-primary" data-mdb-ripple-color="dark" type="submit">生産者情報登録</button>
55                </form>
56            </div>
57        </div>
58    </div>
59
60    @include('footer')
61
62@endsection
63