Question

我有比赛，在锦标赛中，我有分类对于每个类别，我都有CategoriesSettings

我在分类模型中定义了一个关系：

 public function settings()
{
    return $this->hasOne('App\CategorySettings');
}

所以，我可以毫无问题地访问$ tournament-＆gt;类别（在Tournament模型中使用belongsToMany rel。）

我有3张桌子：

锦标赛，类别，category_tournament和CategoriesSettings

category_tournament只是一个数据透视表。

但是，当我尝试循环播放类别并尝试在视图中触及设置时：

@foreach($categories as $category)
    {{ $category->settings}}
@endforeach

我只得到第一类的结果。

然后结果是一个数组，我期待一个CategorySettings对象。

有趣的是，当我输入$ categories时，我有6个类别的集合，但是当我检查类别对象时，我无法找到我的hasOne关系：

 0 => Category {#437 ▼
  #table: "category"
  +timestamps: true
  #fillable: array:2 [▶]
  #connection: null
  #primaryKey: "id"
  #perPage: 15
  +incrementing: true
  #attributes: array:4 [▶]
  #original: array:8 [▶]
  #relations: array:1 [▼
    "pivot" => Pivot {#436 ▼
      #parent: Tournament {#426 ▶}
      #foreignKey: "tournament_id"
      #otherKey: "category_id"
      #guarded: []
      #connection: null
      #table: "category_tournament"
      #primaryKey: "id"
      #perPage: 15
      +incrementing: true
      +timestamps: true
      #attributes: array:4 [▶]
      #original: array:4 [▶]
      #relations: []
      #hidden: []
      #visible: []
      #appends: []
      #fillable: []
      #dates: []
      #dateFormat: null
      #casts: []
      #touches: []
      #observables: []
      #with: []
      #morphClass: null
      +exists: true
      +wasRecentlyCreated: false
    }

我找到了我的枢轴关系

以下是使用以下命令运行的查询：

$tournament->categories

SELECT 
`ken_category`.*,
`ken_category_tournament`.`tournament_id` AS `pivot_tournament_id`,
`ken_category_tournament`.`category_id` AS `pivot_category_id`,
`ken_category_tournament`.`created_at` AS `pivot_created_at`,
`ken_category_tournament`.`updated_at` AS `pivot_updated_at`
FROM
`ken_category`
    INNER JOIN
`ken_category_tournament` ON `ken_category`.`id` =     `ken_category_tournament`.`category_id`
WHERE
`ken_category_tournament`.`tournament_id` = ?

和最终查询：

$category->settings


select * from `ken_category_settings` 
where `ken_category_settings`.`category_id` = ? 
and `ken_category_settings`.`category_id` is not null limit 1

任何人都可以解释我这种行为（以及如何修复:) ???

的Tx

Answer 1

尝试将条件放在if语句中。如果它有设置，它将以其他方式回应它将继续

@foreach($categories as $category)
  @if(count($category->settings) > 0)
   {{ $category->settings->columnname }}
 @endif
@endforeach

Laravel 5.0雄辩的关系问题

1 个答案: