php - Laravel Eloquent ORM 方法基于 ids 数组检索多行

Question

我可能没有按照我想要的方式表达这个问题，但这是我的困境:

我有一个名为“clients”的用户表，其结构如下:

<style type="text/css">
.tg  {border-collapse:collapse;border-spacing:0;}
.tg td{font-family:Arial, sans-serif;font-size:14px;padding:10px 5px;border-style:solid;border-width:1px;overflow:hidden;word-break:normal;}
.tg th{font-family:Arial, sans-serif;font-size:14px;font-weight:normal;padding:10px 5px;border-style:solid;border-width:1px;overflow:hidden;word-break:normal;}
.tg .tg-yw4l{vertical-align:top}
</style>
<table class="tg">
  <tr>
    <th class="tg-yw4l">id</th>
    <th class="tg-yw4l">int(10)</th>
    <th class="tg-031e">unsigned</th>
  </tr>
  <tr>
    <td class="tg-yw4l">client_name</td>
    <td class="tg-yw4l">varchar(255)</td>
    <td class="tg-yw4l"></td>
  </tr>
  <tr>
    <td class="tg-yw4l">id_number</td>
    <td class="tg-yw4l">int(11)</td>
    <td class="tg-yw4l"></td>
  </tr>
  <tr>
    <td class="tg-yw4l">email</td>
    <td class="tg-yw4l">varchar(255)</td>
    <td class="tg-yw4l"></td>
  </tr>
</table>

我有另一个策略“策略”表，其结构如下:

<style type="text/css">
.tg  {border-collapse:collapse;border-spacing:0;}
.tg td{font-family:Arial, sans-serif;font-size:14px;padding:10px 5px;border-style:solid;border-width:1px;overflow:hidden;word-break:normal;}
.tg th{font-family:Arial, sans-serif;font-size:14px;font-weight:normal;padding:10px 5px;border-style:solid;border-width:1px;overflow:hidden;word-break:normal;}
.tg .tg-yw4l{vertical-align:top}
</style>
<table class="tg">
  <tr>
    <th class="tg-yw4l">id</th>
    <th class="tg-yw4l">int(10)</th>
    <th class="tg-yw4l">unsigned</th>
    <th class="tg-031e">AUTO INCREMENT</th>
  </tr>
  <tr>
    <td class="tg-yw4l">client_id</td>
    <td class="tg-yw4l">int(10)</td>
    <td class="tg-yw4l"></td>
    <td class="tg-yw4l"></td>
  </tr>
  <tr>
    <td class="tg-yw4l">type_id</td>
    <td class="tg-yw4l">int(11)</td>
    <td class="tg-yw4l"></td>
    <td class="tg-yw4l"></td>
  </tr>
  <tr>
    <td class="tg-yw4l">product_id</td>
    <td class="tg-yw4l">int(11)</td>
    <td class="tg-yw4l"></td>
    <td class="tg-yw4l"></td>
  </tr>
</table>

“policies”表中的“client_id”相当于“clients”表中的“id”。一个客户可以有多个“策略”。当策略过期时，我想获取策略过期的客户端列表。其逻辑是并非每个用户都会有一个过期或即将到期的策略，但一个用户可以拥有多个即将到期或即将到期的策略。 (例如，在一张有 10 个客户端的表中，总共有 20 个即将到期或已过期的保单，则可以有 5 个客户端具有即将到期或已过期的保单等。)每个保单都与一个客户端相关联。该客户端可以拥有无​​限数量的策略

考虑到客户的“id”等于策略表中的“client_id”，我应该如何计算策略到期的客户数量？

这是我迄今为止尝试过的:

$today = Carbon::today()->toDateString();
$yesterday = Carbon::yesterday()->toDateString();
$expiry_period = Carbon::today()->addDays(3)->toDateString();

$client = DB::table('clients')->join('active_policies', 'clients.id', '=', 'active_policies.client_id')->select('clients.id');
$active_clients = Clients::all();

$policies = ActivePolicies::all();
$total_policies = $policies->count();

$expiring = $policies->where('renewal_date', '<=', $expiry_period)->where('renewal_date', '>=', $today);
$total_expiring = $expiring->count();

$expired = $policies->where('renewal_date', '<=', $yesterday);
$total_expired = $expired->count();

//here's where I try to count the clients with expiring policies.
$with_expiring = $expiring->where('client_id', '=', DB::table('clients')->get('clients.id'))->count();

//here's where I try to count the clients with expired policies.
$with_expired = $expired->where('client_id', '=', DB::table('clients')->get('clients.id'))->count();

执行时出现以下错误:

类型错误:传递给 Illuminate\Database\Grammar::columnize() 的参数 1 必须是给定的数组、字符串类型，在/var/.../app/vendor/laravel/framework/src/Illuminate 中调用/Database/Query/Grammars/Grammar.php 第 131 行

Answer 1

DB::table('clients')->get('clients.id')返回Collection而$expired->where('client_id', '=', '<this should be string>')

尝试:$expiring->where('client_id', '=', DB::table('clients')->get('clients.id')->first())->count()

但是该代码不会提供您想要的内容。

您应该创建 Eloquent 模型并使用它，而不是使用 DB 编写查询外墙。

请参阅此处了解如何定义 Eloquent 模型 https://laravel.com/docs/5.4/eloquent#defining-models

定义 Client 后Eloquent 模型，您可以通过以下方式检索所有客户端:

$clients = Client::whereIn('id', [1, 2, 3]); // where 1,2,3 is the client ids