Laravel 5~嵌套評論的實現

時間 2019-12-06

標籤 laravel 嵌套評論實現简体版

原文原文鏈接

常常咱們看見評論顯示形式有不少，好比'@'某某，又或者像知乎的收縮式的評論，又或者是嵌套式的評論，那麼最一開始也是最多見的就是嵌套式評論，由於這個更加醒目.php

準備工做
1.設計三張表users,posts,comments，表結構以下:css

usershtml

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

postsvue

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

commentslaravel

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層:
Post.php文件web

/**
 * 一篇文章有多個評論
 * @return \Illuminate\Database\Eloquent\Relations\HasMany
 */
public function comments()
{
    return $this->hasMany(Comment::class);
}

/**
 * 獲取這篇文章的評論以parent_id來分組
 * @return static
 */
public function getComments()
{
    return $this->comments()->with('owner')->get()->groupBy('parent_id');
}

Comments.php文件bootstrap

/**
 * 這個評論的所屬用戶
 * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
 */
public function owner()
{
    return $this->belongsTo(User::class, 'user_id');
}

/**
 * 這個評論的子評論
 * @return \Illuminate\Database\Eloquent\Relations\HasMany
 */
public function replies()
{
    return $this->hasMany(Comment::class, 'parent_id');
}

邏輯編寫
咱們所要實現的嵌套評論其實在咱們準備工做中已經有點思路了，咱們首先將一篇文章顯示出來，同時利用文章與評論的一對多關係，進行顯示全部的評論，可是咱們的評論裏面涉及到一個字段就是parent_id，這個字段其實很是的特殊，咱們利用這個字段來進行分組, 代碼就是上面的return $this->comments()->with('owner')->get()->groupBy('parent_id'),具體的過程以下:函數

web.php文件post

\Auth::loginUsingId(1); //用戶id爲1的登陸

//顯示文章和相應的評論
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'));
});

//用戶進行評論
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();
});

視圖代碼
視圖方面咱們須要實現嵌套，那麼隨着用戶互相評論的愈來愈多的話，那麼嵌套的層級也就越多，因此說，咱們這裏須要使用各小技巧來顯示整個評論，咱們使用@include()函數來顯示，那麼咱們試圖的結構以下:ui

- comments
comments.blade.php
form.blade.php
list.blade.php

 - posts
show.blade.php

代碼以下:
show.blade.php

<!DOCTYPE html>
<html lang="en">
<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 class="container" 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'=>$comments['root']])
        <h3>留下您的評論</h3>
        @include('comments.form',['parentId'=>$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">回覆</button>
</form>

list.blade.php

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

最終效果圖以下

最近在研究laravel,看到一個以前作過的功能，以前寫的比較繁瑣，特記錄下來。
摘自：
https://laravel-china.org/art...
https://laravel-china.org/art...

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