FormGroup FormArray - 按名称仅删除一个元素对象。角

Question

    {
  "companies": [
    {
      "company": "example comany",
      "projects": [
        {
          "projectName": "example project",
          "numero": ""
        },
        {
          "projectName": "example project",
          "numero": ""
        },
        {
          "projectName": "example project",
          "numero": ""
        },
        {
          "projectName": "example project",
          "numero": "3"
        }
      ]
    }
  ]
}

我想在发送表单 POST 请求之前从 formGroup 中删除 projectName。是否可以？我尝试使用重置方法，但这会删除所有元素 https://stackblitz.com/edit/generar-json?file=app%2Fapp.component.ts

Answer 1

基本上你需要一张地图，在没有你选择的选项的情况下获得一个新的Array

let object = {
  "companies": [{
    "company": "example comany",
    "projects": [{
        "projectName": "example project",
        "numero": ""
      },
      {
        "projectName": "example project",
        "numero": ""
      },
      {
        "projectName": "example project",
        "numero": ""
      },
      {
        "projectName": "example project",
        "numero": "3"
      }
    ]
  }]
}

object.companies = object.companies.map(company => {
  company.projects = company.projects.map(project => {
    delete project['projectName']; // we delete the key on project each.
    return project;
  });
  return company
});
console.log(object)