Laravel 5.5 お気に入りボタンが反映しない

開発環境　Laravel5.5 PHP MySQL

FavoriteボタンがUnfavariteボタンに切り替わらず、お気に入りページにも追加されません。
Userモデルのfavorite()かunfavorite()がおかしいのかなと考えていますが
なんども見直しましたが原因がわかりません。

//ユーザー機能
Route::group(['middleware' => 'auth'], function(){
    Route::resource('users', 'UsersController', ['only' => 'show']);

    //レシピ関係
    Route::resource('recipes', 'RecipesController');

    //お気に入り関係(ユーザー)
    Route::group(['prefix' => 'users/{id}'], function(){
        Route::get('favorites', 'UsersController@favorites')->name('users.favorites');
    });
    //お気に入り関係（レシピ）
    Route::group(['prefix' => 'recipes/{id}'], function(){
       Route::post('favorite', 'FavoritesController@store')->name('favorites.favorite');
       Route::delete('unfavorite', 'FavoritesController@destroy')->name('favorites.unfavorite');
    });

});

namespace App;

use Illuminate\Notifications\Notifiable;
use Illuminate\Foundation\Auth\User as Authenticatable;

class User extends Authenticatable
{
    use Notifiable;

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'name', 'email', 'password',
    ];

    /**
     * The attributes that should be hidden for arrays.
     *
     * @var array
     */
    protected $hidden = [
        'password', 'remember_token',
    ];

    public function recipes()
    {
        return $this->hasMany(Recipe::class);
    }

    public function favorites()
    {
        return $this->belongsToMany(Recipe::class, 'user_recipe', 'user_id', 'recipe_id')
                    ->withTimestamps();
    }

    public function favorite($recipeId)
    {
        //すでにお気に入りしているか確認
        $exist = $this->is_favorite($recipeId);
        //相手が自分自身ではないか確認
        $its_me = $this->id == $recipeId;

        if($exist || $its_me){
            //すでにお気に入りしていなければ何もしない
            return false;
        } else {
            //まだお気に入りしてなければお気に入りする
            $this->favorites()->attach($recipeId);
            return true;
        }
    }

     public function unfavorite($recipeId)
    {
        //すでにお気に入りしているか確認
        $exist = $this->is_favorite($recipeId);
        //相手が自分自身ではないか確認
        $its_me = $this->id == $recipeId;

        if($exist && !$its_me){
            //すでにお気に入りしていればお気に入りを外す
            $this->favorites()->detach($recipeId);
            return true;
        } else {
            //まだお気に入りしてなければ何もしない
            return false;
        }
    }

    public function is_favorite($recipeId)
    {
        return $this->favorites()->where('recipe_id', $recipeId)->exists();
    }
} 

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Recipe extends Model
{
    protected $fillable = ['user_id', 'name', 'content', 'photo_url'];

    public function user()
    {
        return $this->belongsTo(User::class);
    }

    public function ingredient()
    {
        return $this->hasMany(Ingredient::class);
    }

    public function how_to()
    {
        return $this->hasMany(HowTo::class);
    }

    public function favorite_users()
    {
        return $this->belongsToMany(User::class, 'user_recipe', 'recipe_id', 'user_id')
                    ->withTimestamps();
    }
}

namespace App\Http\Controllers;

use Illuminate\Http\Request;

use App\User;
use App\Micropost;

class UsersController extends Controller
{
    public function show($id)
    {
        $user = User::find($id);
        $recipes = $user->recipes()->orderBy('created_at', 'desc')->paginate(10);

        $data = [
            'user' =>$user,
            'recipes' =>$recipes,
        ];

        return view('users.show', $data);
    }

    public function favorites($id)
    {
        $user = User::find($id);
        $favorites = $user->favorites()->paginate(10);

        $data = [
                'user' => $user,
                'favorites' => $favorites,
            ];

        $data += $this->counts($user);

        return view('users.favorites', $data);
    }
}

namespace App\Http\Controllers;

use Illuminate\Http\Request;

class FavoritesController extends Controller
{
    public function store(Request $request, $id)
    {
        \Auth::user()->favorite($id);
        return back();
    }

    public function destroy($id)
    {
        \Auth::user()->unfavorite($id);
        return back();
    }
}

views/users/favorites.blade.php

@extends('layouts.app')

@section('content')
    <div class="row">
        <aside class="col-md-4">
            <div class="card">
                <div class="card-header">
                    <h3 class="card-title text-center">{{ $user->name }}</h3>
                </div>
                <div class="card-body">
                    {!! Form::open(['url' => '/upload', 'method' => 'post', 'files' => true]) !!}
                    {{--成功メッセージ--}}
                    @if(session('success'))
                    <div class="alert alert-success">
                        {{ session('success') }}
                    </div>
                    @endif
                    <div class="form-group">
                        @if ($user->avatar_filename)
                        <p class="text-center">
                            <img src="{{ asset('storage/avatar/' . $user->avatar_filename) }}" alt="avatar" />
                        </p>
                        @endif
                        {!! Form::label('file', '推奨サイズ200px*200px' , ['class' => 'control-labelse']) !!}
                        {!! Form::file('file') !!}
                    </div>

                    <div class="form-group">
                        {!! Form::submit('アップロード' , ['class' => 'btn btn-primary']) !!}
                    </div>
                    {!! Form::close() !!}
                    {{--<img class="media-object rounded img-fluid" src="{{ Gravatar::src($user->email, 500) }}" alt="">--}}
                </div>
            </div>
        </aside>
        <div class="col-md-8">
            <ul class="nav nav-tabs nav-justified mb-3">
                <li class="nav-item"><a href="{{ route('users.show', ['id' => $user->id]) }}" 
                class-"nav-link {{ Request::is('users/' . $user->id) ? 'active' : ''}}">個人レシピ</a></li>
                <li class="nav-item"><a href="{{ route('users.favorites', ['id' => $user->id]) }}" 
                class-"nav-link {{ Request::is('users/*/favorites') ? 'active' : ''}}">お気に入り</a></li>
            </ul>
            @if (count($favorites) > 0)
                @include('recipes.favorites', ['favorites'=> $favorites])
            @endif
        </div>
    </div>
@endsection

views/recipes/favorites.blade.php

<ul class="media-list">
    @foreach ($favorites as $favorite)
        <li class="media mb-3">
            <div class="media-body ml-3">
                <div class="row">
                    <div class="col-4">
                        <img src="https://placehold.jp/200x200.png"></img>
                        <h3>{!! link_to_route('recipes.show', $recipe->name, ['id' => $recipe->id]) !!}</h3>
                    </div>
                    <div class="col-8">
                        {!! link_to_route('users.show', $recipe->user->name, ['id' => $recipe->user->id]) !!}
                        <span class="text-muted">投稿日時 {{ $recipe->created_at }}</span>
                        <p>{!! nl2br(e($recipe->content)) !!}</p>
                        @if (Auth::id() == $recipe->user_id)
                            {!! Form::model($recipe, ['route' => ['recipes.destroy', $recipe->id], 'method' => 'delete']) !!}
                                {!! Form::submit('削除', ['class' => 'btn btn-danger']) !!}
                            {!! Form::close() !!}
                        @endif
                        @include('favorites.favorite_button', ['recipe' => $recipe])
                    </div>
                </div>
            </div>
        </li>
    @endforeach
</ul>

views/favorites/favorite_button.blade.php

@if (Auth::user()->is_favorite($recipe->id))
    {!! Form::open(['route' => ['favorites.unfavorite', $recipe->id], 'method' => 'delete']) !!}
        {!! Form::submit('Unfavorite', ['class' => "btn btn-danger btn-block"]) !!}
    {!! Form::close() !!}
@else
    {!! Form::open(['route' => ['favorites.favorite', $recipe->id]]) !!}
        {!! Form::submit('Favorite', ['class' => "btn btn-danger btn-block"]) !!}
    {!! Form::close() !!}
@endif