我有这个界面
export interface Student {
cf: string,
firstName: string,
lastName: string,
dateOfBirth: Date,
description?: string,
enrollmentDate?: Date
}
我想用http get request填充学生数组,该数组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,界面的名称与响应的名称不同(firstName而不是first_name),因此,当我在控制台上打印学生的姓名时,会得到undefined。
这是我从中获取数据的服务功能
getStudents(): Observable<Student[]> {
return this.httpClient.get<Student[]>(this.studentsUrl, this.baseService.httpOptions);
}
这是我的学生部分
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)
)
}
}
是否可以将json响应转换为我的Student界面?关于堆栈溢出的几个答案表明map是这样的,但是我不明白如何在subscribe
中使用该运算符alog一种方法是手动循环遍历数组并定义新键,并在使用RxJS map
返回数组之前删除过时的键。
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,这可能是单个HTTP请求的繁重工作。您是否不能定义接口定义以匹配其中一种API?