数组未添加到foreach循环中的变量

遇到了一个奇怪的问题,我要把我的头发拔出来。

我有这个foreach循环

$rubrics = ReaderRubric::where('cycle_subpool_id', "=", $cycle_subpool_id)->get();
foreach ($rubrics as &$rubric) {
    $answers = ReaderRubricAnswer::where('rubric_id', "=", $rubric->rubric_id)->get();
    $rubric['answers'] = $answers;
}

unset($rubric);

Log::info($rubrics);
return $rubrics;

日志 $rubrics

[{"rubric_id":1,"reader_type":24,"document_type":"0","title":"test","question":"qweqwe","activity_type":null},{"rubric_id":2,"reader_type":21,"document_type":"0","title":"test","question":"testing","activity_type":null}]

日志 $rubric['answer'] 在回路中

[{"answer_id":5,"rubric_id":2,"text":"asn 1","value":1},{"answer_id":6,"rubric_id":2,"text":"ans 2","value":2},{"answer_id":7,"rubric_id":2,"text":"ans 3","value":3}]

var_dump(卢比);

object(Illuminate\Database\Eloquent\Collection)#74 (1) {
  ["items":protected]=>
  array(2) {
    [0]=>
    object(Entrada\Modules\Admissions\Models\Entrada\ReaderRubric)#75 (26) {
      ["dateFormat":protected]=>
      string(1) "U"
      ["connection":protected]=>
      string(16) "entrada_database"
      ["table":protected]=>
      string(24) "admissions_reader_rubric"
      ["primaryKey":protected]=>
      string(9) "rubric_id"
      ["fillable":protected]=>
      array(5) {
        [0]=>
        string(11) "reader_type"
        [1]=>
        string(13) "document_type"
        [2]=>
        string(5) "title"
        [3]=>
        string(8) "question"
        [4]=>
        string(13) "activity_type"
      }

如果我查一下日志 $卢比 和 $rubric['answers'] 这完全是应该的。

但是,如果我 ,他们都没有 对他们来说。

我知道这很简单,我只是盯着它看太久了,现在看不见了。