Angular2：ngFor内部ngb-accordian总是指向最后一个元素

Question

我正在开发一个基于ngb-accordion的小部件，它内部包含一个ngb-panel，其中包含一个循环遍历元素数组的div。

数据结构：            1-N
员工＆lt; ------＆gt; previousEmployments            1-1
员工＆lt; ------＆gt;保险

员工，保险和以前的员工都在单独的ngb-panel中。包含previousEmployments的ngb面板在div元素上包含ngFor。

<div *ngFor="let previousEmploymenttemp of employee.previousEmployments; let i=index" >
        <div class="col-sm-12">          

    <div class="row">


    <div class="form-group col-md-4">       
    <ig-input  [inputField]="editForm.controls.company" [inputErrors]="editForm.controls.company?.errors">
        <label class="form-control-label" jhiTranslate="finaldemoApp.employee.previousEmployment.company" for="subfield_company">Company</label>

        <input type="text" class="form-control" name="company" id="subField_company"
            [(ngModel)]="previousEmploymenttemp.company"
         />
    </ig-input>

    </div> 
....
....

让我们假设employee.previousEmployments包含三个元素，ngFor循环遍历元素，但所有输入都包含元素employee.previousEmployments [2]的值，即最后一个元素。