angular - 如何在 angular2 的数组中的数组中设置补丁值(更新嵌套值)？

Question

我有一个嵌套数组，例如

permission": [
{
  "id": 2,
  "key": "creatBusinessPermission",
  "legend": "BusinessModule",
  "ischecked": false,
  "label": " Create Business Settings",
  "roles": [
    {
      "id": 1,
      "key": "self",
      "ischecked": false
    },
    {
      "id": 2,
      "key": "selfrole",
      "ischecked": false
    },
    {
      "id": 3,
      "key": "other",
      "ischecked": false
    },
    {
      "id": 4,
      "key": "All",
      "ischecked": false
    }
  ]
},
{
  "id": 3,
  "key": "editBusinessPermission",
  "legend": "BusinessModule",
  "ischecked": true,
  "label": " Edit Business Settings",
  "roles": [
    {
      "id": 1,
      "key": "self",
      "ischecked": false
    },
    {
      "id": 2,
      "key": "selfrole",
      "ischecked": false
    },
    {
      "id": 3,
      "key": "other",
      "ischecked": false
    },
    {
      "id": 4,
      "key": "All",
      "ischecked": false
    }
  ]
}]

对于上面的数组，我使用响应式(Reactive)形式， 构建表单后，我有一个关于 onchange 权限的函数，当调用该函数时，会检查与权限相关的内容，并且 self 会检查更改为 true，我完成的权限检查为 true 完美， 我正在努力使** self **被检查为真实，

这是我的代码

 (<FormArray>this.roleForm.controls['permission']).at(index).patchValue({
      ischecked : true
    }) This is works fine

在这里我不知道该怎么做

(<FormArray>this.roleForm.controls['permission']).at(index).get('roles').at(1)..patchValue({
      ischecked : true
    }) this code giving error, Probebly I did n't no how to do

Answer 1

试试这个

let x = (<FormArray>this.roleForm.controls['permission']).at(index).get('roles')
let y =   (<FormControl>x.controls[0])

y.patchValue({
        ischecked: true
      })