Angular2 /错误:未找到集合 [英] Angular2 / Error: Collection not found
问题描述
我是Angular2的新手,并尝试建立一个Todo应用程序。
这是我的文件结构:
我的 todo.service.ts 代码(内部共享文件夹)
从'@ angular / core'导入{Injectable};来自'@ angular / http'的
import {Http,Headers};
import'rxjs / add / operator / toPromise';来自'./todo.model'的
import {ITodo};
@Injectable()
导出类TodoService {
构造函数(私有http:Http){}
getTodos():Promise< ITodo [] > {
返回this.http.get('api / todos')
.toPromise()
.then(res => res.json()。data)
。赶上(this.handleError);
}
addTodo(todo:ITodo):Promise< ITodo> {
返回this.post(todo);
}
deleteTodo(todo:ITodo):Promise< ITodo> {
返回this.delete(todo);
}
私人帖子(todo:ITodo):Promise< ITodo> {
let headers = new Headers({
'Content-Type':'application / json'
});
返回this.http.post('api / todos',JSON.stringify(todo),{headers})
.toPromise()
.then(res => ; res.json()。data)
.catch(this.handleError)
}
private delete(todo:ITodo):Promise< ITodo> {
let headers = new Headers({
'Content-Type':'application / json'
});
let url =`api / todos / $ {todo.id}`;
返回this.http.delete(url,{headers})
.toPromise()
.then(res => todo)
.catch(this .handleError)
}
private handleError(错误:任何):Promise< any> {
console.log('错误发生>>>',错误);
返回Promise.reject(error.message || error);
}
}
我的 main.ts 代码
从'@ angular / platform-browser-dynamic'导入{bootstrap};
从'@ angular / http'导入{HTTP_PROVIDERS,XHRBackend};
从'angular2-in-memory- web-api'导入{InMemoryBackendService,SEED_DATA};来自'./shared/todo.data'的
import {TodoSeedData};来自'./app.component'的
import {AppComponent};
bootstrap(AppComponent,[
HTTP_PROVIDERS,
{提供:XHRBackend,useClass:InMemoryBackendService},
{提供:SEED_DATA,useClass:TodoSeedData},
]);
在我需要http之前,所有工作都没有错误。
发现类似的问题
我猜这是http的问题。
请帮忙。
我在调用我的WebAPI时遇到了类似的问题。最后我不得不注释掉InMemoryDataService - 一旦我这样做,那么错误就消失了,我能够点击我的WebAPI:
AngularJS 2:从json文件中获取数据无法正常工作
I am very new to Angular2 and trying to build up a Todo app.
Here's my file structure:
My todo.service.ts code (inside shared folder)
import { Injectable } from '@angular/core';
import { Http, Headers } from '@angular/http';
import 'rxjs/add/operator/toPromise';
import { ITodo } from './todo.model';
@Injectable()
export class TodoService {
constructor(private http: Http){}
getTodos(): Promise<ITodo[]> {
return this.http.get('api/todos')
.toPromise()
.then(res => res.json().data)
.catch(this.handleError);
}
addTodo(todo: ITodo): Promise<ITodo> {
return this.post(todo);
}
deleteTodo(todo: ITodo): Promise<ITodo> {
return this.delete(todo);
}
private post(todo: ITodo): Promise<ITodo> {
let headers = new Headers({
'Content-Type': 'application/json'
});
return this.http.post('api/todos', JSON.stringify(todo), { headers })
.toPromise()
.then(res => res.json().data)
.catch(this.handleError)
}
private delete(todo: ITodo): Promise<ITodo> {
let headers = new Headers({
'Content-Type': 'application/json'
});
let url = `api/todos/${todo.id}`;
return this.http.delete(url, { headers })
.toPromise()
.then(res => todo)
.catch(this.handleError)
}
private handleError(error: any): Promise<any> {
console.log('The error occured >>>', error);
return Promise.reject(error.message || error);
}
}
My main.ts code
import { bootstrap } from '@angular/platform-browser-dynamic';
import { HTTP_PROVIDERS, XHRBackend } from '@angular/http';
import { InMemoryBackendService, SEED_DATA } from 'angular2-in-memory- web-api';
import { TodoSeedData } from './shared/todo.data';
import {AppComponent} from './app.component';
bootstrap(AppComponent,[
HTTP_PROVIDERS,
{ provide: XHRBackend, useClass: InMemoryBackendService },
{ provide: SEED_DATA, useClass: TodoSeedData },
]);
Everything had been working without errors till I needed http.
Found sort of similar problem here
but it is not working to me.
Console.log shows error: Collection 'todos' not found.
I guess it's an issue with http. Please, help.
I had a similar issue calling my WebAPI. In the end I had to comment out the InMemoryDataService - as soon as I did this then the error went away and I was able to hit my WebAPI: AngularJS 2 : Getting data from json file not working
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