Laravel Eloquent 模型继承

使用Laravel Eloquent模型继承是一种优雅的方式来管理和组织数据库中的数据。通过继承Eloquent模型，我们可以轻松地定义和操作数据库表的数据，使得代码更加简洁、可读性更高。

php
php artisan make:model User

php
namespace App\Models;
use Illuminate\Database\Eloquent\Model;
class User extends Model
{
    protected $table = 'users';
    protected $primaryKey = 'id';
    
    public function role()
    {
        return $this->belongsTo(Role::class);
    }
}

php
namespace App\Models;
use Illuminate\Database\Eloquent\Model;
class User extends Model
{
    protected $table = 'users';
    protected $primaryKey = 'id';
    public function posts()
    {
        return $this->hasMany(Post::class);
    }
}

php
namespace App\Models;
use Illuminate\Database\Eloquent\Model;
class Post extends Model
{
    protected $table = 'posts';
    protected $primaryKey = 'id';
    public function user()
    {
        return $this->belongsTo(User::class);
    }
}

php
// 获取所有用户的博文
$users = User::all();
foreach ($users as $user) {
    $posts = $user->posts;
    // 处理博文数据
}
// 获取某个用户的博文数量
$user = User::find(1);
$postCount = $user->posts->count();
// 创建一篇新的博文
$user = User::find(1);
$post = new Post;
$post->title = 'Hello World';
$post->content = 'This is my first blog post.';
$user->posts()->save($post);

php
namespace App\Models;
use Illuminate\Database\Eloquent\Model;
class User extends Model
{
    protected $table = 'users';
    protected $primaryKey = 'id';
    public function posts()
    {
        return $this->hasMany(Post::class);
    }
}

php
namespace App\Models;
use Illuminate\Database\Eloquent\Model;
class Post extends Model
{
    protected $table = 'posts';
    protected $primaryKey = 'id';
    public function user()
    {
        return $this->belongsTo(User::class);
    }
}