将应用程序更新到 Angular 7 和 RxJS 6.3.3 后 Observable 出现问题
Problem with Observable after update app to Angular 7 and RxJS 6.3.3
我将我的应用程序更新到 Angular 7 和 RxJS 6.3.3,但我在更改代码时遇到了问题。我真的需要帮助,因为我找不到 google 或堆栈溢出的解决方案。
我的导入:
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()
函数的代码:
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:
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?你能帮帮我吗?
是我在该错误之前执行的上一步。也许我在上一步有什么问题?
我在阅读所有评论后进行了更改,所以现在 get() 函数如下所示:
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:
不要从 rxjs-compat
导入 observable,使用 rxjs
使用 rxjs-compat
的唯一充分理由是,如果您的依赖项仍然依赖于旧版本的 rxjs
。
我注意到您从 test
函数返回了一个 Observable,而您可能不应该这样做。
无错误示例:https://stackblitz.com/edit/angular-zimn8f
查看并告诉我。
我将我的应用程序更新到 Angular 7 和 RxJS 6.3.3,但我在更改代码时遇到了问题。我真的需要帮助,因为我找不到 google 或堆栈溢出的解决方案。
我的导入:
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()
函数的代码:
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:
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?你能帮帮我吗?
我在阅读所有评论后进行了更改,所以现在 get() 函数如下所示:
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:
不要从 rxjs-compat
导入 observable,使用 rxjs
使用 rxjs-compat
的唯一充分理由是,如果您的依赖项仍然依赖于旧版本的 rxjs
。
我注意到您从 test
函数返回了一个 Observable,而您可能不应该这样做。
无错误示例:https://stackblitz.com/edit/angular-zimn8f
查看并告诉我。