Laravel5实现嵌套评论的形式(代码详解)

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经常我们看见评论显示形式有很多,比如’@’某某,又或者像知乎的收缩式的评论,又或者是嵌套式的评论,那么最一开始也是最常见的就是嵌套式评论,因为这个更加醒目.

准备工作

1、设计三张表users,posts,comments,表结构如下:

users

Schema::create('users', function (Blueprint $table) {     $table->increments('id');     $table->string('name');     $table->string('email')->unique();     $table->string('password');     $table->rememberToken();     $table->timestamps(); });

posts

Schema::create('posts', function (Blueprint $table) {     $table->increments('id');     $table->string('title');     $table->integer('user_id')->index();     $table->text('content');     $table->timestamps(); });

comments

Schema::create('comments', function (Blueprint $table) {     $table->increments('id');     $table->integer('user_id')->index();     $table->integer('post_id')->index();     $table->integer('parent_id')->index()->default(0);     $table->text('body');     $table->timestamps(); });

2.Model层:
Post.php文件

/**  * 一篇文章有多个评论  * @return IlluminateDatabaseEloquentRelationsHasMany  */ public function comments() {     return $this->hasMany(Comment::class); }  /**  * 获取这篇文章的评论以parent_id来分组  * @return static  */ public function getComments() {     return $this->comments()->with('owner')->get()->groupBy('parent_id'); }

Comments.php文件

/**  * 这个评论的所属用户  * @return IlluminateDatabaseEloquentRelationsBelongsTo  */ public function owner() {     return $this->belongsTo(User::class, 'user_id'); }  /**  * 这个评论的子评论  * @return IlluminateDatabaseEloquentRelationsHasMany  */ public function replies() {     return $this->hasMany(Comment::class, 'parent_id'); }

逻辑编写
我们所要实现的嵌套评论其实在我们准备工作中已经 有点思路了,我们首先将一篇文章显示出来,同时利用文章与评论的一对多关系,进行显示所有的评论,但是我们的评论里面涉及到一个字段就是parent_id,这个字段其实非常的特殊,我们利用这个字段来进行分组, 代码就是上面的return $this->comments()->with(‘owner’)->get()->groupBy(‘parent_id’),具体的过程如下:

web.php文件

Auth::loginUsingId(1); //用户id为1的登录  //显示文章和相应的评论 Route::get('/post/show/{post}', function (AppPost $post) {     $post->load('comments.owner');     $comments = $post->getComments();     $comments['root'] = $comments[''];     unset($comments['']);     return view('posts.show', compact('post', 'comments')); });  //用户进行评论 Route::post('post/{post}/comments', function (AppPost $post) {     $post->comments()->create([         'body' => request('body'),         'user_id' => Auth::id(),         'parent_id' => request('parent_id', null),     ]);     return back(); });

视图代码
视图方面我们需要实现嵌套,那么随着用户互相评论的越来越多的话,那么嵌套的层级也就越多,所以说,我们这里需要使用各小技巧来显示整个评论,我们使用@include()函数来显示,那么我们试图的结构如下:

 - comments comments.blade.php form.blade.php list.blade.php   - posts show.blade.php

代码如下:
show.blade.php

<!DOCTYPE html> <html> <head>     <meta charset="utf-8">     <meta http-equiv="X-UA-Compatible" content="IE=edge">     <meta name="viewport" content="width=device-width, initial-scale=1">     <link href="//cdn.bootcss.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet"> </head> <body> <div style="margin-top: 100px">     <div class="col-md-10 col-md-offset-1">         <h2>{{$post->title}}</h2>         <h4>{{$post->content}}</h4>         <hr>         @include('comments.list',['collections'=>$comments['root']])         <h3>留下您的评论</h3>         @include('comments.form',['parentId'=>$post->id])     </div> </div> </body> </html>

comment.blade.php

<div class="col-md-12">     <h5><span style="color:#31b0d5">{{$comment->owner->name}}</span>:</h5>     <h5>{{$comment->body}}</h5>      @include('comments.form',['parentId'=>$comment->id])      @if(isset($comments[$comment->id]))         @include('comments.list',['collections'=>$comments[$comment->id]])     @endif     <hr> </div>

form.blade.php

<form method="POST" action="{{url('post/'.$post->id.'/comments')}}" accept-charset="UTF-8">     {{csrf_field()}}      @if(isset($parentId))         <input type="hidden" name="parent_id" value="{{$parentId}}">     @endif      <div class="form-group">         <label for="body" class="control-label">Info:</label>         <textarea id="body" name="body"  class="form-control" required="required"></textarea>     </div>     <button type="submit" class="btn btn-success">回复</button> </form>

list.blade.php

@foreach($collections as $comment)     @include('comments.comment',['comment'=>$comment]) @endforeach

最终效果图如下

Laravel5实现嵌套评论的形式(代码详解)

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