如何获取每个帖子的2条最新评论?我使用的是laravel 5.2和Postgres
My comments table
+-----+---------------------+---------+
| id | created_at | post_id |
+-----+---------------------+---------+
| 344 | 2014-08-17 21:25:46 | 1 |
| 320 | 2014-08-17 21:25:45 | 1 |
| 4 | 2014-08-17 21:25:26 | 1 |
| 72 | 2014-08-17 21:25:29 | 1 |
| 158 | 2014-08-17 21:25:37 | 2 |
| 423 | 2014-08-17 21:25:50 | 2 |
| 59 | 2014-08-17 21:25:29 | 2 |
| 227 | 2014-08-17 21:25:40 | 2 |
| 308 | 2014-08-17 21:25:45 | 3 |
| 34 | 2014-08-17 21:25:28 | 3 |
+-----+---------------------+---------+
My posts table
+-----+---------------------+---------+
| id | created_at | title |
+-----+---------------------+---------+
| 1 | 2014-08-17 21:25:46 | a |
| 2 | 2014-08-17 21:25:45 | b |
| 3 | 2014-08-17 21:25:26 | c |
+-----+---------------------+---------+
我想要得到最近2个评论的所有帖子。我怎么能做到这一点雄辩。提前感谢!
您需要在Post模型中定义额外的关系，该关系将返回2个最新评论:
class Post extends Model {
public function latest_comments() {
return $this->hasMany(Comment::class)->take(2)->orderBy('created_at', 'desc');
}
}
现在，对于每个帖子，您可以使用$post->latest_comments;