As we know, this is a bad option for mysql
$authors = Authors::all();
foreach ($authors as $author) {
echo $author->name;
foreach ($author->posts as $post) {
echo $post->title;
}
}
If we have 3 authors with 3 posts each, eloquent make 4 SQL queries (1 for authors, and 1 more per author for get their posts)
$authors = Authors::with('posts')
->all();
foreach ($authors as $author) {
echo $author->name;
foreach ($author->posts as $post) {
echo $post->title;
}
}
This is better for mysql, because now we have only 2 SQL queires (1 for authors and 1 for posts).
Queries are like:
select * from `authors` where `authors`.`deleted_at` is null
select * from `posts`
where `posts`.`deleted_at` is null and `author`.`id` in (?, ?, ?)
But, is it possible maintain the last PHP code but making a SQL query like this?
select authors.*, posts.* from `authors`
left join posts on posts.author_id = authors.id
where `authors`.`deleted_at` is null
You can try local scopes. The code won't get exactly like that, but may end like:
$authors = Authors::theNameYouChooseForTheScope()->get();
And you would define the scope like this:
public function scopeTheNameYouChooseForTheScope($query)
{
return $query->leftJoin('posts', 'authors.id', '=', 'posts.author_id')
}
Official documentatation: https://laravel.com/docs/5.5/eloquent#local-scopes
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.