我有这个界面
export interface Student {
cf: string,
firstName: string,
lastName: string,
dateOfBirth: Date,
description?: string,
enrollmentDate?: Date
}
我想使用 http get 请求填充学生数组,该请求为每个学生返回以下 json
{cf: "blablabla", first_name: "Mario", last_name: "Rossi", date_of_birth: "1998-01-24", enrollment_date: "2019-03-20" },
如您所见,界面的名称与响应不同(firstName 而不是 first_name),因此当我将学生的姓名打印到控制台时,我得到未定义。
这是我从中获取数据的服务函数
getStudents(): Observable<Student[]> {
return this.httpClient.get<Student[]>(this.studentsUrl, this.baseService.httpOptions);
}
这是我的学生组件
export class StudentsComponent implements OnInit {
students: Student[];
childIcon = faChild;
plusIcon = faPlus;
private _newStudent: boolean = false;
constructor(private studentsService: StudentsService) { }
ngOnInit(): void {
this.studentsService.getStudents().subscribe(
(result: Student[]) => {
this.students = result;
this.students.forEach(student => console.log(student));
},
error => console.log(error)
)
}
}
有没有办法将 json 响应转换为我的学生界面?关于堆栈溢出的几个答案表明 map 是一种方法,但我不明白如何将该运算符与 subscribe
一起使用最佳答案
一种方法是手动循环数组并定义新键并删除过时的键,然后使用 RxJS map
返回数组。
服务
import { pipe } from 'rxjs';
import { map } from 'rxjs/operators';
getStudents(): Observable<Student[]> {
return this.httpClient.get<Student[]>(this.studentsUrl, this.baseService.httpOptions).pipe(
map(response => response.forEach(student => {
student.firstName = student.first_name;
student.lastName = student.last_name;
student.dateOfBirth = student.date_of_birth;
student.enrollmentDate = student.enrollment_date;
delete student.first_name;
delete student.last_name;
delete student.date_of_birth;
delete student.enrollment_date;
});
)
);
}
但是,根据数组中元素的数量,对于单个 HTTP 请求来说,这可能是一项繁重的操作。您无法定义接口(interface)定义来匹配 API 定义吗?
关于json - Angular 9 将 json 响应映射到数组,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/61558581/