Question

我有category_to_news和news_main table

category_to_news

news_id int
name varchar
title timestamp

news_main

id int
title varchar
image varchar
created_at timestamp

如何通过news_main的字段和category_news的字段返回？我已经尝试过这种方法而且它不起作用

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

Answer 1

你需要加入这个，因为with（）运行另一个查询，所以在那里订购不会做这个工作：

$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()

Answer 2

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

如何在Laravel中通过急切加载选择另一个表连接中的字段

2 个答案: