Question

我正在使用Laravel Eloquent来挑选出独特的答案。

所以在我的数据库中我有3个答案，但它们有两个不同的问题。

所以我需要返回的是2号，而不是3号。

到目前为止我的代码是：

$foundation_scores = Foundation::where('user_id', $this->user_id)
                                       ->where('foundation_section', 'theory')
                                       ->get();

        $foundation_scores->unique('foundation_question');
        $foundation_scores = count($foundation_scores);

唯一（'foundation_question'）返回 3 。它应该返回 2

为什么会出现这种想法？

我的收藏如下（注）我已将其作为数组输出以避免所有代码Laravel返回：

array:3 [
  0 => array:12 [
    "foundation_id" => 3
    "user_id" => 17019
    "foundation_section" => "theory"
    "unit_id" => 0
    "foundation_sub_section" => "Unit 1"
    "foundation_question" => 0
    "foundation_reference" => "Ref one way st"
    "foundation_answer" => "Ref answer st"
    "created_at" => "2017-10-25 11:57:05"
    "updated_at" => "2017-10-25 11:57:05"
    "deleted_at" => null
    "friendly_date" => "25th October 2017"
  ]
  1 => array:12 [
    "foundation_id" => 4
    "user_id" => 17019
    "foundation_section" => "theory"
    "unit_id" => 0
    "foundation_sub_section" => "Unit 1"
    "foundation_question" => 0
    "foundation_reference" => "Red"
    "foundation_answer" => "Ans"
    "created_at" => "2017-10-25 12:02:01"
    "updated_at" => "2017-10-25 12:02:01"
    "deleted_at" => null
    "friendly_date" => "25th October 2017"
  ]
  2 => array:12 [
    "foundation_id" => 5
    "user_id" => 17019
    "foundation_section" => "theory"
    "unit_id" => 0
    "foundation_sub_section" => "Unit 1"
    "foundation_question" => 1
    "foundation_reference" => "XY"
    "foundation_answer" => "Z"
    "created_at" => "2017-10-25 12:02:19"
    "updated_at" => "2017-10-25 12:02:19"
    "deleted_at" => null
    "friendly_date" => "25th October 2017"
  ]
]

他们是一个独特的错误。或者是我做错了什么？

Answer 1

$foundation_scores->unique('foundation_question');未将唯一值分配给任何新变量。 unique()也不会更改原始收藏。

所以：

$unique_collection = $foundation_scores->unique('foundation_question');
echo count($unique_collection);

Laravel Eloquent独特（） - 似乎不起作用

1 个答案: