Question

我正在尝试从特定列中检索内容，下面是我尝试的内容

//get the department
$department = department::where('user_dep', '=', 1)->select('dep_id')->get();
//but seems the department retrieved an array, which I dont want, I want only the content
$notification = notification::where('department', '=', $department)->get();

但遗憾的是没有工作。似乎$department检索了一个数组，比如列的标题及其我认为的值。

我尝试将$department替换为特定的整数（1）并检索记录（它有效）但如果我使用$department则返回空结果。有什么想法吗？

$notification = notification::where('department', '=', 1)->get();

$ department的vard_dump结果

object(Illuminate\Database\Eloquent\Collection)[206]
protected 'items' => 
array (size=1)
  0 => 
    object(App\department)[210]
      protected 'table' => string 'department' (length=10)
      protected 'connection' => null
      protected 'primaryKey' => string 'id' (length=2)
      protected 'perPage' => int 15
      public 'incrementing' => boolean true
      public 'timestamps' => boolean true
      protected 'attributes' => 
        array (size=1)
          ...
      protected 'original' => 
        array (size=1)
          ...
      protected 'relations' => 
        array (size=0)
          ...
      protected 'hidden' => 
        array (size=0)
          ...
      protected 'visible' => 
        array (size=0)
          ...
      protected 'appends' => 
        array (size=0)
          ...
      protected 'fillable' => 
        array (size=0)
          ...
      protected 'guarded' => 
        array (size=1)
          ...
      protected 'dates' => 
        array (size=0)
          ...
      protected 'casts' => 
        array (size=0)
          ...
      protected 'touches' => 
        array (size=0)
          ...
      protected 'observables' => 
        array (size=0)
          ...
      protected 'with' => 
        array (size=0)
          ...
      protected 'morphClass' => null
      public 'exists' => boolean true

Answer 1

问题是由在Eloquent中使用错误的闭包方法引起的。使用->get()将获取符合给定条件的所有行（即使您只查找单个行）并将其作为对象集合返回。使用->first()将（逻辑上）找到第一个匹配的行并将其作为单个对象返回。有两种方法可以解决这个问题：

选项1：

$department = department::where('user_dep', '=', 1)->select('dep_id')->get();
$notification = notification::where('department', '=', $department[0]->dep_id)->get();
// var_dump($department); would equate to an array of `department` items;

返回整个集合，但只查找第一个结果＆＃39; dep_id。

选项2：

$department = department::where('user_dep', '=', 1)->select('dep_id')->first();
$notification = notification::where('department', '=', $department->dep_id)->get();
// var_dump($department); would equate to a single `department` item;

找到第一行并根据其dep_id返回通知。两种方法都有效，但选项2将是更直接的选择。

Answer 2

尝试使用它：

$department = department::where('user_dep', '=', 1)->select('dep_id')->get();
$notification = notification::where('department', '=', (int) $department)->get();

获取所选列

2 个答案: