Sql 拉威尔和雄辩的集合

如何对已加载的数据集求和

这是我的表格结构：

regions table
+------------+------------------+------+-----+---------------------+----------------+
| Field      | Type             | Null | Key | Default             | Extra          |
+------------+------------------+------+-----+---------------------+----------------+
| id         | int(10) unsigned | NO   | PRI | NULL                | auto_increment |
| region     | varchar(255)     | NO   |     | NULL                |                |
| created_at | timestamp        | NO   |     | 0000-00-00 00:00:00 |                |
| updated_at | timestamp        | NO   |     | 0000-00-00 00:00:00 |                |
+------------+------------------+------+-----+---------------------+----------------+

submits table
+------------+------------------+------+-----+---------------------+----------------+
| Field      | Type             | Null | Key | Default             | Extra          |
+------------+------------------+------+-----+---------------------+----------------+
| id         | int(10) unsigned | NO   | PRI | NULL                | auto_increment |
| region_id  | int(11)          | NO   |     | NULL                |                |
| deals      | int(11)          | NO   |     | NULL                |                |
| created_at | timestamp        | NO   |     | 0000-00-00 00:00:00 |                |
| updated_at | timestamp        | NO   |     | 0000-00-00 00:00:00 |                |
+------------+------------------+------+-----+---------------------+----------------+

以下是我的模型/关系：-

class Region extends Eloquent {

  public function submits()
  {
    return $this->hasMany('Submit');
  }

}

<?php

class Submit extends Eloquent {

  public function regions()
  {
    return $this->belongsTo('Region');
  }
  
}

这就是返回的数据的样子（在json格式中，我理解$regions是一个雄辩的集合）：-

我想不出如何将“交易”（4）的总数发送回视图？

您可以显示这一点

$deals = $regions->sum(function ($region) {
    return $region->submits->sum('deals');
});

$invoices=Region:：withSum（'submits:deals'）->get（）；

$deals = $regions->sum(function ($region) {
    return $region->submits->sum('deals');
});