Angular 忽略使用Typescript在获取请求时未定义的属性集

我正试图从服务器请求一些数据。当我将属性的模型更改为未定义时，将在查询字符串中发送此“未定义”字符串

let filterModel = new GroupFilterModel();
filterModel.status = anycondition ? "opened" : undefined;
this.http.get<GroupModel[]>("apiurl", { params: filterModel });

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我希望避免发送状态变量。我如何才能有这种行为？

您可以使用lodash删除具有未定义和空值的属性，如下所示：

let filterModel = new GroupFilterModel();
filterModel.status = anycondition ? "opened" : undefined;
this.http.get<GroupModel[]>("apiurl", { params: _.pickBy(filterModel) });

让filterModel=newgroupfiltermodel（）；
filterModel.status=任何条件？“打开”：未定义；
this.http.get（“apiurl”，{params:u.pickBy（filterModel）}）；

有关使用vanilla JS的其他解决方案，请参阅：

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在ES6中使用这一衬里：

Object.keys(obj).forEach(key => obj[key] === undefined ? delete obj[key] : '');

仿佛：

filterModel.status = anycondition ? "opened" : undefined;
const model = Object.keys(filterModel).forEach(key => obj[key] === undefined ? delete obj[key] : '');
this.http.get<GroupModel[]>("apiurl", { params: model });

filterModel.status = anycondition ? "opened" : undefined;
const model = Object.keys(filterModel).forEach(key => obj[key] === undefined ? delete obj[key] : '');
this.http.get<GroupModel[]>("apiurl", { params: model });

Object.prototype.StripUndefined = function StripUndefined() {
  return this.keys(filterModel).forEach(key => obj[key] === undefined ? delete obj[key] : '');
};