Laravel5 implements the form of nested comments (detailed code explanation)

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We often see comments displayed in many forms, such as '@' so-and-so, or contracted comments like Zhihu, or nested comments, so at the beginning it is also The most common one is nested comments, because this is more eye-catching.

Preparation work

1. Design three tables: users, posts, comments, table The structure is as follows:

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 layer:
Post.php file

/**
 * 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 file

/**
 * 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');
}

Logic writing
The nested comments we want to implement actually already have some ideas in our preparation work. We first display an article. , and use the one-to-many relationship between articles and comments to display all comments. However, our comments involve a field called parent_id. This field is actually very special. We use this field to perform grouping. The code is the return above. $this->comments()->with('owner')->get()->groupBy('parent_id'), the specific process is as follows:

web.php file

\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();
});

View code
We need to implement nesting in terms of views, so as users comment more and more on each other, there will be more levels of nesting, so, We need to use various tricks to display the entire comment here. We use the @include() function to display it. Then the structure of our attempt is as follows:

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

 - posts
show.blade.php

The code is as follows:
show.blade.php

nbsp;html>


    <meta>
    <meta>
    <meta>
    <link>


<div>
    <div>
        <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>

comment.blade.php

<div>
    <h5>
<span>{{$comment->owner->name}}</span>:</h5>
    <h5>{{$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

list.blade.php

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

The final rendering is as follows

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