官方文档：

https://learnku.com/docs/laravel/6.x/eloquent/5176#b438f8

项目中经常会使用到 find 查找数据，有时候需要判断数据是否存在，laravel提供了这样的方式方法：

1、findOrNew

$result = OutPatientOrderModel::getQuery()->with([

    'detail' => function ($query) {

        $query->where('is_deleted', '0')->select('img_des', 'illness_des', 'order_id', 'pkid', 'is_visit');

    }

])->findOrNew($id, $fields)->toArray();

执行结果：

hospital\app\Services\Inquiry\OrderService.php line:49Array

(

)

2、findOrFail

$result = OutPatientOrderModel::getQuery()->with([

    'detail' => function ($query) {

        $query->where('is_deleted', '0')->select('img_des', 'illness_des', 'order_id', 'pkid', 'is_visit');

    }

])->findOrFail($id, $fields)->toArray();

执行结果：

"message": "No query results for model [App\\Models\\Inquiry\\OutPatientOrderModel] 5563908201780521180",

3、find

$result = OutPatientOrderModel::getQuery()->with([

    'detail' => function ($query) {

        $query->where('is_deleted', '0')->select('img_des', 'illness_des', 'order_id', 'pkid', 'is_visit');

    }

])->find($id, $fields)->toArray();

执行结果：

"message": "Call to a member function toArray() on null",

官方文档：

https://learnku.com/docs/laravel/6.x/eloquent/5176#b438f8