Laravel 4 如何在Laravel中通过快速加载选择另一个表联接中的字段

我有分类到新闻和新闻主表

分类至新闻

• 新闻中心
• 名称varchar
• 标题时间戳

主要新闻

• id int
• 标题varchar
• 图像varchar
• 在时间戳处创建

如何按新闻主字段和类别新闻字段返回？我试过这种方法，但不管用

$posts = Categorytonews::with(array(
    'Newsmain' => function($query)
    {
        $query->orderBy('id', 'DESC')->select(array('title', 'id', 'created_at', 'image'));
    }
    ))
    ->get( );

---

您需要对此进行连接，因为with（）运行另一个查询，因此在那里排序不会完成此任务：

$posts = Categorytonews::with('Newsmain') // get all fields from Newsmain
  ->join('news_main', 'category_to_news.news_id', '=', 'news_main.id') // join for ordering
  ->orderBy('news_main.id','desc') // order by joined field
  ->get('category_to_news.*'); // select only main table, you don't need joined fields
                               // on Categorytonews model - they will be loaded by with()

$posts = Categorytonews::with('Newsmain') // get all fields from Newsmain
  ->join('news_main', 'category_to_news.news_id', '=', 'news_main.id') // join for ordering
  ->orderBy('news_main.id','desc') // order by joined field
  ->get('category_to_news.*'); // select only main table, you don't need joined fields
                               // on Categorytonews model - they will be loaded by with()