Laravel return redirect()->back();

Controllerでは、viewの指定なしにredirect()->back();と書ける。

PostCommentsController.php

 public function index(){
    	$comments = Comment::all();
    	return view('admin.comments.index', compact('comments'));
    }

admin/comments/index.blade.php

@if($comments)
	<h1>Comments</h1>
	<table class="table table-striped">
		<thead>
		<tr>
		  <th>Id</th>
		  <th>Author</th>
		  <th>Email</th>
		  <th>Body</th>
		  <th>Post</th>
		</tr>
		</thead>
		<tbody>
		
			@foreach($comments as $comment)
			<tr>
			  <td>{{$comment->id}}</td>
			  <td>{{$comment->author}}</td>
			  <td>{{$comment->email}}</td>
			  <td>{{$comment->body}}</td>
			  <td><a href="{{route('home.post',$comment->post_id)}}">View Post</td>
			  <td>
			  	@if($comment->is_active == 1)
			  			{!! Form::open(['method'=>'PATCH', 'action'=>['PostCommentsController@update', $comment->id]]) !!}
					        {{ csrf_field()}}
					        <input type="hidden" name="is_active" value="0">

					        <div class="form-group">
					            {!! Form::submit('Un-approve', ['class'=>'btn btn-info']) !!}
					        </div>
        				{!! Form::close() !!}
						
			  	@else
						{!! Form::open(['method'=>'PATCH', 'action'=>['PostCommentsController@update', $comment->id]]) !!}
					        {{ csrf_field()}}
					        <input type="hidden" name="is_active" value="1">

					        <div class="form-group">
					            {!! Form::submit('Approve', ['class'=>'btn btn-info']) !!}
					        </div>
        				{!! Form::close() !!}

			  	@endif
			  </td>
			  <td>
			  	{!! Form::open(['method'=>'DELETE', 'action'=>['PostCommentsController@destroy', $comment->id]]) !!}
			        {{ csrf_field()}}

			        <div class="form-group">
			            {!! Form::submit('Delete', ['class'=>'btn btn-danger']) !!}
			        </div>
				{!! Form::close() !!}

			  </td>
			</tr>
			@endforeach
		
		</tbody>
	</table>
	@else
	<h1 class="text-center">No Comments</h1>
		
	@endif

PostCommentController.php

public function update(Request $request, $id){
    	Comment::findOrFail($id)->update($request->all());
    	return redirect('/admin/comments');
    }

    public function destroy($id){
    	Comment::findOrFail($id)->delete();
    	return redirect()->back();
    }

Post/index.blade.php

<td><a href="{{route('home.post', $post->id)}}">View Post</td>
			  <td><a href="{{route('admin.comments.show', $post->id)}}">View Comments</td>

Post.php

public function comments(){
        return $this->hasMany('App\Comment');
    }

Route

Route::group(['middleware'=>'auth'], function(){

		Route::post('comment/reply', 'CommentRepliesController@createReply');
});

post.blade.php

@if($comments)
                    @foreach($comments as $comment)
                <!-- Comment -->
                <div class="media">
                    <a class="pull-left" href="#">
                        <img class="media-object" src="http://placehold.it/64x64" alt="">
                    </a>
                    <div class="media-body">
                        <h4 class="media-heading">{{$comment->author}}
                            <small>{{$comment->created_at->diffForhumans()}}</small>
                        </h4>
                        {{$comment->body}}

                        @if($comment->replies)
                            @foreach($comment->replies as $reply)
                        <div class="nested-comment media">
                            <a class="pull-left" href="#">
                                <img class="media-object" src="http://placehold.it/64x64" alt="">
                            </a>
                            <div class="media-body">
                                <h4 class="media-heading">{{$reply->author}}
                                    <small>{{$reply->created_at->diffForhumans()}}</small>
                                </h4>
                                {{$reply->body}}
                            </div>

                            {!! Form::open(['method'=>'POST', 'action'=>'CommentRepliesController@store']) !!}
                                {{ csrf_field()}}

                                <input type="hidden" name="comment_id" value="{{$comment->id}}">
                         
                                <div class="form-group">
                                    {!! Form::label('body', 'Body') !!}
                                    {!! Form::textarea('body', null, ['class'=>'form-control', 'rows'=>1]) !!}
                                </div>                                
                                <div class="form-group">
                                    {!! Form::submit('Submit', ['class'=>'btn btn-primary']) !!}
                                </div>
                            {!! Form::close() !!}

                        </div>
                            @endforeach
                        @endif

post.blade.php

<script
  src="https://code.jquery.com/jquery-2.2.4.min.js"
  integrity="sha256-BbhdlvQf/xTY9gja0Dq3HiwQF8LaCRTXxZKRutelT44="
  crossorigin="anonymous"></script>
    <script>
        $(".comment-reply-container .toggle-reply").click(function(){
            $(this).next().slideToggle("slow");
        });
    </script>

replies/show.blade.php

@section('content')
	
	@if($replies)
	<h1>replies</h1>
	<table class="table table-striped">
		<thead>
		<tr>
		  <th>Id</th>
		  <th>Author</th>
		  <th>Email</th>
		  <th>Body</th>
		  <th>Post</th>
		</tr>
		</thead>
		<tbody>
		
			@foreach($replies as $reply)
			<tr>
			  <td>{{$reply->id}}</td>
			  <td>{{$reply->author}}</td>
			  <td>{{$reply->email}}</td>
			  <td>{{$reply->body}}</td>
			  <td><a href="{{route('home.post',$reply->comment->post->id)}}">View Post</td>
			  <td>
			  	@if($reply->is_active == 1)
			  			{!! Form::open(['method'=>'PATCH', 'action'=>['CommentRepliesController@update', $reply->id]]) !!}
					        {{ csrf_field()}}
					        <input type="hidden" name="is_active" value="0">

					        <div class="form-group">
					            {!! Form::submit('Un-approve', ['class'=>'btn btn-success']) !!}
					        </div>
        				{!! Form::close() !!}
						
			  	@else
						{!! Form::open(['method'=>'PATCH', 'action'=>['CommentRepliesController@update', $reply->id]]) !!}
					        {{ csrf_field()}}
					        <input type="hidden" name="is_active" value="1">

					        <div class="form-group">
					            {!! Form::submit('Approve', ['class'=>'btn btn-info']) !!}
					        </div>
        				{!! Form::close() !!}

			  	@endif
			  </td>
			  <td>
			  	{!! Form::open(['method'=>'DELETE', 'action'=>['CommentRepliesController@destroy', $reply->id]]) !!}
			        {{ csrf_field()}}

			        <div class="form-group">
			            {!! Form::submit('Delete', ['class'=>'btn btn-danger']) !!}
			        </div>
				{!! Form::close() !!}

			  </td>
			</tr>
			@endforeach
		</tbody>
	</table>
	
	@else
	
		<h1 class="text-center">No replies</h1>
	@endif
	
@stop

comments/index.blade.php

<td><a href="{{route('admin.comments.replies.show', $comment->id)}}">View Replies</a></td>

CommentRepliesController.php

use App\Comment;
public function show($id)
    {
        //
        $comment = Comment::findOrFail($id);
        $replies = $comment->replies;
        return view('admin.comments.replies.show', compact('replies'));
    }

public function update(Request $request, $id)
    {
        //
        CommentReply::findOrFail($id)->update($request->all());

        return redirect()->back();
    }
public function destroy($id)
    {
        //
        CommentReply::findOrFail($id)->delete();

        return redirect()->back();
    }