在 Eloquent 属性中返回查询的模型

Posted 2023-03-14

【中文标题】在 Eloquent 属性中返回查询的模型

【英文标题】：Return queried model in Eloquent attribute

【发布时间】：2017-04-18 23:01:21

【问题描述】：

我正在使用 Laravel 雄辩的 ORM，我希望能够将查询的 laravel 模型作为属性返回，或者更理想的是作为雄辩的关系返回。这就是我想要做的：

class CalendarEvent extends Model

    protected $appends = array('conflicts');

    public function getConflictsAttribute () 
        $conflicts =  CalendarEvent::where('calendar_event_type','=',$this->calendar_event_type)
                      ->where('start','<',$this->end)
                      ->where('end','>',$this->start)
                      ->get();   

        return $conflicts;
    

这是一种尝试获取重叠日历事件，这将是冲突事件，作为针对每个事件的对象返回。

这意味着任何查询运行都会返回冲突：

$event = CalendarEvent::where('id','=',123)->first()->toJson();
$event; // JSON object should contain conflicting events

这会导致非 laravel 500 错误和空白页面。 storage/logs/laravel 没有附加到。我的 /var/log/site-error.log 在请求期间附加了这个：

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Illuminate\Database\Eloquent\Model->toArray() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Support/Collection.php:1102 PHP 消息：PHP 372。 Illuminate\Database\Eloquent\Model->attributesToArray() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Model.php:2454 PHP 消息：PHP 373。 Illuminate\Database\Eloquent\Model->mutateAttributeForArray() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Model.php:2518 PHP 消息：PHP 374. Illuminate\Support\Collection->toArray() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Model.php:2764 PHP 消息：PHP 375.array_map() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Support/Collection.php:1103 PHP 消息：PHP 376。 Illuminate\Support\Collection->Illuminate\Supportclosure() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Support/Collection.php:1103 PHP 消息：PHP 377. Illuminate\Database\Eloquent\Model->toArray() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Support/Collection.php:1102 PHP 消息：PHP 378。 Illuminate\Database\Eloquent\Model->attributesToArray() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Model.php:2454 PHP 消息：PHP 379。 Illuminate\Database\Eloquent\Model->mutateAttributeForArray() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Model.php:2518 PHP 消息：PHP 380. Illuminate\Support\Collection->toArray() /home/vagrant/silverback/httpdocs/vendor/larav 2016/12/04 14:21:16 [错误] 792#0: *42880 FastCGI 在标准错误中发送： “ck/httpdocs/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Model.php:2764 PHP 消息：PHP 417.array_map() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Support/Collection.php:1103 PHP 消息：PHP 418。 Illuminate\Support\Collection->Illuminate\Supportclosure() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Support/Collection.php:1103 PHP 消息：PHP 419. Illuminate\Database\Eloquent\Model->toArray() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Support/Collection.php:1102 PHP 消息：PHP 420。 Illuminate\Database\Eloquent\Model->attributesToArray() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Model.php:2454 PHP 消息：PHP 421。 Illuminate\Database\Eloquent\Model->mutateAttributeForArray() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Model.php:2518 PHP 消息：PHP 422. Illuminate\Support\Collection->toArray() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Model.php:2764 PHP 消息：PHP 423.array_map() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Support/Collection.php:1103 PHP 消息：PHP 424。 Illuminate\Support\Collection->Illuminate\Supportclosure() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Support/Collection.php:1103 PHP 消息：PHP 425. Illuminate\Database\Eloquent\Model->toArray() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Support/Collection.php:1102 PHP 消息：PHP 426。 Illuminate\Database\Eloquent\Model->attributesToArray() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Model.php:2454 PHP 消息：PHP 427。 Illuminate\Database\Eloquent\Model->mutateAttributeForArray() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Mode 2016/12/04 14:21:16 [错误] 792#0: *42880 FastCGI 在标准错误中发送： “e/Database/Eloquent/Model.php:2518 PHP 消息：PHP 464。 Illuminate\Support\Collection->toArray() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Model.php:2764 PHP 消息：PHP 465.array_map() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Support/Collection.php:1103 PHP 消息：PHP 466。 Illuminate\Support\Collection->Illuminate\Supportclosure() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Support/Collection.php:1103 PHP 消息：PHP 467. 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Illuminate\Database\Eloquent\Model->toArray() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Support/Collection.php:1102 PHP 消息：PHP 474。 Illuminate\Database\Eloquent\Model->attributesToArray() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Database/Eloquent/Model.php:2454 PHP 消息：PHP 475. Illuminate\Database\Eloquent\Model->mu 2016/12/04 14:21:16 [错误] 792#0: *42880 FastCGI 在标准错误中发送： “ry\Grammars\mysqlGrammar->wrapValue() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Database/Grammar.php:79 PHP 消息：PHP 511。 Illuminate\Database\Query\Grammars\MySqlGrammar->isJsonSelector() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Database/Query/Grammars/MySqlGrammar.php:225 PHP 消息：PHP 512. Illuminate\Support\Str::contains() /home/vagrant/silverback/httpdocs/vendor/laravel/framework/src/Illuminate/Database/Query/Grammars/MySqlGrammar.php:255" 从上游读取响应头时，客户端：192.168.42.1， 服务器：silverback.dev，请求：“GET /test HTTP/1.1”，上游： “fastcgi://unix:/var/run/php5-fpm.sock:”，主机：“silverback.dev”

更新： 我已经决定使用 Eloquent ORM 是不可能的。我实际上想做的是像这样的 Mysql，作为关系附加：

select * from calendar_events as calendar_events_2 where calendar_events_2.start < calendar_events_1.end AND calendar_events_2.end > calendar_events_1.start

相反，我不情愿地选择了一个 foreach 循环来在获取数据后附加数据。我相信这是我唯一的选择。

foreach ($shoot_timeline_data as $shoot) 
    foreach ($shoot->booking_cases as $booking_case) 
        $booking_case->booking->conflicts = CalendarEvent::find_***es(
            $booking_case->booking->calendar_event_type, 
            $booking_case->booking->start, 
            $booking_case->booking->end,
            [$booking_case->booking->id] // excludes this ID via 'whereNotIn'
        );
    

【问题讨论】：

你能发布错误信息吗？您的代码似乎很好。这可能是由于格式更改或导致Carbon 错误和第二个或第三个where 子句产生错误的原因造成的字符丢失。在可以读取确切的错误消息之前，没有什么是清楚的。

我添加了更多关于错误的信息，并更改了我的代码示例以显示我试图通过预加载实现的目标。

【参考方案1】：

错误似乎是由附加属性引起的，您试图在数组中获取其他模型实例。另一种方法可能是在 self 上定义一个关系，例如

class CalendarEvent extends Model
    public function conflicts()
     
        return  $this->hasMany(CalendarEvent::class)
                ->where('calender_event_type','=', $this->calendar_event_type);
    
  

那么你可以尝试查询为

$event = CalendarEvent::where('id','=',123)->with('conflicts')->first()->toJson();  

尚未测试，但尝试看看它是否有效。

编辑

尝试使用带有延迟加载的参数

$event = CalendarEvent::where('id', '=', 123)->first();
or
$event = CalendarEvent::findOrFail(123);  //it will find the record by given primary key - 123 or fail i.e. throw 'MODELNOTFOUNDEXCEPTION'

$start = $event->start;
$end = $event->end;
$event->load('conflicts', function($query) use ($start, $end)
          $query->where('start', '<', $start)
                ->where('end', '>', $end)
        )->get();

【讨论】：

这似乎是前进的方向，我必须将其作为“惰性急切加载”运行，否则模型的 $this->start 为空。然而，即使是延迟加载，有时 $this->start 和 $this->end 也会返回为 null。这些数据库字段都不是空的。 $shoot_timeline_data->load([ 'booking_cases.booking.conflicts', ]);

在这种情况下，您可以在获取模型后加载关系。 $event=CalendarEvent::where ('id','=',123)->first(); 然后 `$event->load ('conflicts');

这对我来说是有道理的，但是当我这样做是一种雄辩的关系时，例如： return $this->hasMany('App\CalendarEvent','calendar_event_type','calendar_event_type') ->where( 'start','end) ->where('end','>',$this->start) ; ，我收到错误：非法运算符和值组合：在 Builder->where('start', '

但是，数据库值不为空。

【参考方案2】：

你需要退货

class CalendarEvent extends Model

    protected $appends = array('conflicts');

    public function getConflictsAttribute () 
    
        return CalendarEvent::where('calendar_event_type','=',$this->calendar_event_type)
                      ->where('start','<',$this->end)
                      ->where('end','>',$this->start)
                      ->get();   
    

【讨论】：

对不起，我的真实代码要复杂得多，我已经简化了它，在我的问题中遗漏了那一行。我刚试过这个，我得到一个代码 500 错误，但不是 laravel 类型的。

"not of a laravel kind" 意味着日志中什么也没有显示？ storage/logs/laravel.log