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laravel ÊÇÒ»¸öÊ¢ÐÐµÄ php ¿ò¼Ü£¬ËüÌṩÁËÒ»ÖÖÓÅÑŵķ½·¨À´¹¹½¨ web Ó¦ÓóÌÐòºÍ api¡£ÔÚ¹¹½¨Ó¦ÓóÌÐòµÄÀú³ÌÖУ¬¾­³ £»áÐèÒª¾ÙÐбíÖ®¼äµÄ¹ØÁªÅÌÎÊ£¬ÒÔ±ãÓÚ»ñÈ¡¸ü¶àµÄÊý¾ÝÐÅÏ¢¡£±¾ÎĽ«ÖصãÏÈÈÝÔõÑùʹÓà laravel ¾ÙÐÐÁ¬±íÅÌÎÊ¡£

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class User extends Model
{
    /**
     * Get the post that belongs to the user.
     */
    public function post()
    {
        return $this->belongsTo(Post::class);
    }
}

class Post extends Model
{
    /**
     * Get the comments for the blog post.
     */
    public function comments()
    {
        return $this->hasMany(Comment::class);
    }
}

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$users = User::with('post')->get();

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ͬÑùµØ£¬ÎÒÃÇÒ²¿ÉÒÔÔÚ post ºÍ comment Ö®¼ä¾ÙÐйØϵÅÌÎÊ¡£

$posts = Post::with('comments')->get();

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$comments = Comment::with(['post' => function ($query) {
    $query->where('published', true);
}])->get();

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class User extends Model
{
    /**
     * Get the posts for the user by role.
     */
    public function postsByRole($role)
    {
        return $this->hasManyThrough(
            'App\Post', 
            'App\Category', 
            'user_id', 
            'category_id'
        )->where('role', '=', $role);
    }
}

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class User extends Model
{
    /**
     * The roles that belong to the user.
     */
    public function roles()
    {
        return $this->belongsToMany(Role::class);
    }
}

class Role extends Model
{
    /**
     * The users that belong to the role.
     */
    public function users()
    {
        return $this->belongsToMany(User::class);
    }
}

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