我想用 Eloquent 创建产品过滤器。
我是这样开始的
$query = Product::whereHas('variants')
->with('variants')
->with('reviews')
$query = $this->addOrderConstraints($request, $query);
$products = $query->paginate(20);
在哪里
private function addOrderConstraints($request, $query)
{
$order = $request->input('sort');
if ($order === 'new') {
$query->orderBy('products.created_at', 'DESC');
}
if ($order === 'price') {
$query->orderBy('variants.price', 'ASC');
}
return $query;
}
但是,这不起作用,因为 Eloquent 正在执行这样的查询(来自 Laravel DebugBar 的信息)
select count(*) as aggregate from `products` where exists
(select * from `variants` where `products`.`id` = `variants`.`product_id`)
select * from `products` where exists
(select * from `variants` where `products`.`id` = `variants`.`product_id`)
select * from `variants` where `variants`.`product_id` in ('29', '30', '31', '32', '33', '34', '35', '36', '37', '38', '39', '40', '41', '42', '43', '44', '45', '46', '47', '48')
等等
所以当我尝试使用按价格排序时,它只是明显的错误
Unknown column 'variants.price' in 'order clause' (SQL: select * from
`products` where exists (select * from `variants` where `products`.`id` =
variants
. product_id
) 通过 variants
订购. price
asc 限制 20 偏移 0)那么是否可以使用 Eloquent 执行关系排序?
最佳答案
这将对子查询进行排序。不是“第一次查询(产品查询)”。
基本上,您的子查询将是:select * from variants where product_id in (....) order by price
,这不是你想要的,对吧?
<?php
// ...
$order = $request->sort;
$products = Product::whereHas('variants')->with(['reviews', 'variants' => function($query) use ($order) {
if ($order == 'price') {
$query->orderBy('price');
}
}])->paginate(20);
如果要对产品 +/或变体进行排序,则需要使用 join。
$query = Product::select([
'products.*',
'variants.price',
'variants.product_id'
])->join('variants', 'products.id', '=', 'variants.product_id');
if ($order === 'new') {
$query->orderBy('products.created_at', 'DESC');
}
if ($order === 'price') {
$query->orderBy('variants.price');
}
return $query->paginate(20);
关于laravel - 在 Eloquent 中按关系字段执行排序,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/48321076/