laravel Eloquent ORM —— 关联

<code>posts
    id - integer
    title - string
    body - text

comments
    id - integer
    post_id - integer
    user_id - integer
    body - text
users
    id - integer
    name - string
    phone - integer
    sex - integer
    
comment_likes
    id - integer
    comment_id - integer
    user_id - integer</code>

<code><?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Posts extends Model
{
     /**
     * @var string
     */
    protected $table = 'posts';

    public function comments()
    {
        return $this->belongsTo('App\Comments', 'post_id', 'id');
    }
}</code>

<code>posts
    id - integer
    title - string
    body - text

comments
    id - integer
    post_id - integer
    user_id - integer
    body - text
users
    id - integer
    name - string
    phone - integer
    sex - integer
    
comment_likes
    id - integer
    comment_id - integer
    user_id - integer</code>

<code><?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Posts extends Model
{
     /**
     * @var string
     */
    protected $table = 'posts';

    public function comments()
    {
        return $this->belongsTo('App\Comments', 'post_id', 'id');
    }
}</code>

<code>class Comment extends Model {
    public function user () {
        return $this->hasOne('App\User', 'id', 'user_id');
    }
}</code>

<code>$posts = Post::where(....)->with(['comments' => function($query) {
    $query->with('user');
}])->get();

foreach($posts $post)
    foreach($post->comments as $comment)
        echo $comments->user->name;</code>

<code>$posts = Post::find(1);
foreach ($posts->comments as $comment)
    echo $comment->user->name;</code>