从复杂的原始 SQL-query 创建 Eloquent 模型

Question

我正在考虑该方法的正确设计，该方法为用户提供了很久以前最后一次约会的客户列表。

所以我有 2 table（简体）：

客户（id，first_name）
约会（id，client_id，日期时间）

我想做的是：获取很久以前的最后一次约会的 3 位客户的列表。

所以我做了什么：我 select 有最早约会的用户和 return 他们（使用复杂的 SQL 查询）。然后我从中创建模型。

这个案例的设计好吗？

use Illuminate\Database\Eloquent\Collection;

class ClientRepository {

    /**
     * Get clients with no appointments in the near history (sort by the date of last appointment ASC)
     *
     * @todo Make a better way to find falling clients (more Laravelish maybe?)
     * @param $count How many clients should method return
     * @return Illuminate\Database\Eloquent\Collection 
     */
    static public function getLost($count=3) {

        //this SQL looks too long but works as charm
        //solution based on 
        $sql = "
            SELECT * FROM (
                SELECT clients.*, clients.id AS cli_id , appointments.datetime AS last_appointment_datetime
                FROM clients
                INNER JOIN appointments ON clients.id=appointments.client_id
                ORDER BY appointments.datetime ASC
            ) AS tmp_table
            GROUP BY cli_id
            ORDER BY last_appointment_datetime ASC
            LIMIT ?
        ";

        $users = \DB::select($sql,[$count]);
        foreach($users as $key=>$user) {
            $user_array = (array)$user;
            $users[$key] = new Client();
            $users[$key]->forceFill($user_array);
        }
        $collection = new Collection($users);

        return $collection;
    }

}

Answer 1

您可以无需子选择并使用Eloquent的查询构建器：

//select clients joined with their appointments
$users = Client::join('appointments', 'appointments.client_id', '=', 'clients.id') 
  //group rows by client ID (if client has multiple appointments then client would appear multiple times in the result set
  ->groupBy('clients.id') 
  //sort them by date of last appointment in descending order
  ->orderByRaw('MAX(appointments.datetime)') 
  ->get();

从复杂的原始 SQL-query 创建 Eloquent 模型

Create Eloquent model from complex raw SQL-query

mysql

laravel

eloquent

laravel-5

laravel-5.1