Laravel and relationships

本文关键字：relationships and Laravel | 更新日期: 2023-09-27

我已经创建了几个表，

News (id, news_titles_id, create_time)

新闻标题(id, name)

现在为我的模型:

class News extends Eloquent {
    protected $table = 'News';
    public function title() {
        return $this->belongsTo('newsTitles', 'news_titles_id');
    }
}
class NewsTitles extends Eloquent {
    protected $table = 'NewsTitles';
}

现在如果我尝试使用

$news = News::all();
echo $news->title->name;

我得到标题未定义属性错误。

我在这里做错了什么?我错过了什么吗?

您的表如下所示:

表:NewsTitles: (id, name)

表:News: (id, news_titles_id, create_time)

模型:

class NewsTitles extends Eloquent {
    protected $table = 'NewsTitles';
    public function news()
    {
        return $this->hasOne('News', 'news_title_id');
    }
}
class News extends Eloquent {
    protected $table = 'News';
    public function title()
    {
        return $this->belongsTo('NewsTitles', 'news_title_id');
    }
}

使用

$news = News::with('title')->all(); // returns a collection (more than one)
echo $news->first()->title->name; // Get first News
echo $news->get(0)->title->name; // Get first News
echo $news->get(1)->title->name; // Get second News

或者你可以循环:

foreach($news as $item) {
    echo $item->title->name;
}

我觉得应该是

return $this->hasOne('NewsTitle', 'news_title_id');

因为News对象"有一个"新闻标题。

在NewsTitle模型中，关系的反比为

public function news()
{
  return $this->belongsTo('News', 'news_title_id');
}