将应用程序更新到Angular 7和RxJS 6.3.3后可观察到的问题 [英] Problem with Observable after update app to Angular 7 and RxJS 6.3.3
问题描述
我将我的应用程序更新为Angular 7和RxJS 6.3.3,在对代码进行更改时遇到了问题.我真的需要帮助,因为我无法找到Google解决方案或堆栈溢出.
I updated my app to Angular 7 and RxJS 6.3.3 and I've got a problems during making changes into my code. I really need help with that, because I can't to find solution into google or stack overflow.
我的进口商品:
import { Observable, of } from 'rxjs';
import { map, catchError } from 'rxjs/operators';
import { Injectable, Inject, Optional, InjectionToken } from '@angular/core';
import { Headers, ResponseContentType, Response } from '@angular/http';
import { HttpClient } from '@angular/common/http';
这是我的test
函数的代码:
protected test(response: Response): Observable<MyResponseClass | null> {
const status = response.status;
if (status === 200) {
let result200: any = null;
... some code ...
return of<MyResponseClass | null>(result200);
}
return of<MyResponseClass | null>(<any>null);
}
这里是MyResponseClass
伪代码:
class MyResponseClass implements IMyResponseClass {
property1?: string | undefined;
property2?: string | undefined;
property3: boolean;
...
}
IMyResponseClass
伪代码:
interface IMyResponseClass {
property1?: string | undefined;
property2?: string | undefined;
property3: boolean;
}
这是我的get()
函数代码:
get(): Observable<MyResponseClass | null> {
let url_ = some_url;
let options_: any = {
method: "get",
headers: new Headers({
"Content-Type": "application/json",
"Accept": "application/json"
})
};
return this.http.request(url_, options_).pipe(
map((response_: any) => { return this.test(response_); })),
catchError((err: any, caught: Observable<MyResponseClass | null>) => {
if (caught instanceof Response) {
try {
return this.test(<any>caught);
} catch (e) {
return <MyResponseClass | null><any>Observable.throw(e);
}
} else
return <MyResponseClass | null><any>Observable.throw(caught);
})
);
}
我仍然收到此错误:
这是此错误的文本版本:
Here is a text version of this error:
Argument of type '(err: any, caught: Observable<MyResponseClass>) => MyResponseClass | Observable<MyResponseClass>' is not assignable to parameter of type '(err: any, caught: Observable<MyResponseClass>) => ObservableInput<MyResponseClass>'.
Type 'MyResponseClass | Observable<MyResponseClass>' is not assignable to type 'ObservableInput<MyResponseClass>'.
Type 'MyResponseClass' is not assignable to type 'ObservableInput<MyResponseClass>'.
Type 'MyResponseClass' is not assignable to type 'Iterable<MyResponseClass>'.
Property '[Symbol.iterator]' is missing in type 'MyResponseClass'.
我做错了什么?你能帮我吗?
What I'm doing wrong? Will you help me?
此处是我在该错误之前所做的上一步.也许在上一步中我出了什么问题?
Here is the previous step which I did before that error. Maybe did I something wrong on previous step?
我在阅读所有注释后进行了更改,因此现在的get()函数如下所示:
I made a changes after read all of comments so now the get() function looks like that:
return this.http.request(url_, options_).pipe(
map((response_: any) => { return this.test(response_); }),
catchError((err: any, caught: Observable<MyResponseClass | null>) => {
if (caught instanceof Response) {
try {
return this.test(<any>caught);
} catch (e) {
return throwError(e);
}
} else
return throwError(caught);
})
);
我仍然遇到错误:
推荐答案
我注意到您可能不应该从test
函数返回一个Observable.
I noticed you're returning an Observable from the test
function, when you probably shouldn't.
无错误示例: https://stackblitz.com/edit/angular-zimn8f
检查并让我知道.
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