如何计算Laravel中分组集合中的项目数？

问题描述

请我要计算每个分组集合中的项目数。假设该集合返回了三个组项目，我想计算每个组中的集合

我这样做了，但是对我来说没用

$collection = vendor::all();
$grouped = $collection->groupBy('vendor_discount');
$counted = $grouped->countBy();
return $counted->all();

这是错误重新出现

array_key_exists()：第一个参数应该是字符串或整数

这样做

$user_info = DB::table('vendors')
                 ->select('vendor_discount',DB::raw('count(*) as total'))
                 ->groupBy('vendor_discount')
                 ->get();

这是结果

0: {vendor_discount: null,total: 1}
total: 1
vendor_discount: null
1: {vendor_discount: "10%",total: 2}
total: 2
vendor_discount: "10%"
2: {vendor_discount: "20%",total: 2}
total: 2
vendor_discount: "20%"

如何正确显示在视图模板中？

解决方法

您的查询

$user_info = DB::table('vendors')
                 ->select('vendor_discount',DB::raw('count(*) as total'))
                 ->groupBy('vendor_discount')
                 ->get()->toArray();

return $user_info;

然后在视图文件中

//Loop through the values
foreach($user_info as $user){
    echo $user->vendor_discount." - ".$user->total;
}