雄辩的渴望加载限制限制 [英] Eloquent Eager Loading Constraint Limit

问题描述

我有一个发表和评论模型.

I have a Post and Comment model.

帖子与评论之间具有hasMany关系. 评论与邮政有一个to be的关系.

Post has a hasMany relationship to Comment. Comment has a belongsTo relationship to Post.

我希望加载带有评论的帖子，但我希望限制为每个帖子只能获得3条评论.我该如何通过Eloquent做到这一点?

I want to eager load posts with their comments, but I want to limit to only get 3 comments per posts. How can I do this by Eloquent?

Post::with(array('comments' => function($query)
{
  $query->take(3);
}))->take(10)->get();

但是此约束只会为所有10条帖子加载3条评论，而不是每条帖子3条评论.

But this constraint will only load 3 comments for all the 10 posts instead of 3 comments per post.

如果通过Eloquent还无法做到这一点，是否还有其他解决方案也可以实现预先加载?

If this is not yet possible via Eloquent, is there any other solution that also implements eager loading?

谢谢

推荐答案

这不是laravel限制，而是SQL限制.

This is not a laravel limitation but a SQL limitation.

最好的选择是不使用紧急加载，而是缓存结果以提高性能.

Best option is to not use eager loading and cache the results for performance instead.

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