Laravel 5~嵌套评论的实现

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 \Illuminate\Database\Eloquent\Relations\HasMany
 */
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 \Illuminate\Database\Eloquent\Relations\BelongsTo
 */
public function owner()
{
    return $this->belongsTo(User::class, 'user_id');
}

/**
 * 这个评论的子评论
 * @return \Illuminate\Database\Eloquent\Relations\HasMany
 */
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 (\App\Post $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 (\App\Post $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




    
    
    
    


{{$post->title}}

{{$post->content}}


@include('comments.list',['collections'=>$comments['root']])

留下您的评论

@include('comments.form',['parentId'=>$post->id])

comment.blade.php

{{$comment->owner->name}}:
{{$comment->body}}
@include('comments.form',['parentId'=>$comment->id]) @if(isset($comments[$comment->id])) @include('comments.list',['collections'=>$comments[$comment->id]]) @endif

form.blade.php

{{csrf_field()}} @if(isset($parentId)) @endif

list.blade.php

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

最终效果图如下

最近在研究laravel,看到一个之前做过的功能,之前写的比较繁琐,特记录下来。
摘自:
https://laravel-china.org/art...
https://laravel-china.org/art...

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