Property 'map' is not recognized on type 'Object' and needs to be addressed

Question

Property 'map' is not recognized on type 'Object' and needs to be addressed

I am currently using Angular CLI: 6.0.8 and have implemented the service shown below. However, my code editor's linter keeps showing an error message that reads:

[ts] Property 'map' does not exist on type 'Object'.
any

The error specifically points to the return statement containing the .map() function:

............

return bills.map((bill) => new Bill(bill));

.................

service

// Imported HttpClient for making HTTP requests.
import { HttpClient } from '@angular/common/http';
import { Injectable } from '@angular/core';

import { Bill } from '../../models/bill'

import { Observable } from  'rxjs/Observable';

import  'rxjs/add/operator/catch';

import  'rxjs/add/operator/map';

// Convert this TypeScript class into an injectable service.
@Injectable()
export class BillServiceProvider {
  // Define your back-end API address.
  baseUrl:string = "http://localhost:8000/api/properties";
  
  constructor(private http: HttpClient) {}

  // Sending a GET request to /bills
  public getBills(): Observable<Bill[]> {
    return this.http
    .get(this.baseUrl + '/bills')
    .map(bills => {
      return bills.map((bill) => new Bill(bill));
    })
    .catch((err)=>{
      console.error(err);
    })

  }

angular typescript angular6

Answer 1

Answer №1

To define the type of data being returned, you can use an interface or a class when working with Angular services. In this scenario, you would utilize

return this.http.get<Bill[]>

public  retrieveBills(): Observable<Bill[]> {
    return this.http.get<Bill[]>(this.baseUrl + '/bills')
    .map(bills => {
      return bills.map((bill) => new Bill(bill));
    })
    .catch((err)=>{
      console.error(err);
    })

Answer 2

To define the type of data being returned, you can use an interface or a class when working with Angular services. In this scenario, you would utilize

return this.http.get<Bill[]>

public  retrieveBills(): Observable<Bill[]> {
    return this.http.get<Bill[]>(this.baseUrl + '/bills')
    .map(bills => {
      return bills.map((bill) => new Bill(bill));
    })
    .catch((err)=>{
      console.error(err);
    })

Answer 3

Answer №2

With the release of version 5.5, a new approach is introduced which involves utilizing "pipeable operators"

myObservable .pipe(map(data => data)) .subscribe(...);

Answer 4

With the release of version 5.5, a new approach is introduced which involves utilizing "pipeable operators"

myObservable .pipe(map(data => data)) .subscribe(...);

Answer 5

Answer №3

Give this code a shot

// Start by importing the necessary modules for HttpClient and Injectable
import { HttpClient } from '@angular/common/http';
import { Injectable } from '@angular/core';

// Import the Bill model
import { Bill } from '../../models/bill'

// Import Observable for handling asynchronous data streams
import { Observable } from  'rxjs/Observable';

// Import necessary operators for manipulating observables
import  'rxjs/add/operator/catch';
import  'rxjs/add/operator/map';

// Convert this TypeScript class into an injectable service.
@Injectable()
export class BillServiceProvider {
  // Define the base URL of the API
  baseUrl:string = "http://localhost:8000/api/properties";
  
  // Inject HttpClient module in the constructor
  constructor(private http: HttpClient) {
    // console.log('Hello BillServiceProvider Provider');
  }

  // Create a method to retrieve bills using HTTP GET request
  public getBills(): Observable<Bill[]> {
    return this.http
      .get(this.baseUrl + '/bills')
      .map(bills => {
        return bills.map((bill) => {
          const billObj = new Bill(bill);
          return billObj;
        });
      })
      .catch((err)=>{
        console.error(err);
      })

  }

Answer 6

Give this code a shot

// Start by importing the necessary modules for HttpClient and Injectable
import { HttpClient } from '@angular/common/http';
import { Injectable } from '@angular/core';

// Import the Bill model
import { Bill } from '../../models/bill'

// Import Observable for handling asynchronous data streams
import { Observable } from  'rxjs/Observable';

// Import necessary operators for manipulating observables
import  'rxjs/add/operator/catch';
import  'rxjs/add/operator/map';

// Convert this TypeScript class into an injectable service.
@Injectable()
export class BillServiceProvider {
  // Define the base URL of the API
  baseUrl:string = "http://localhost:8000/api/properties";
  
  // Inject HttpClient module in the constructor
  constructor(private http: HttpClient) {
    // console.log('Hello BillServiceProvider Provider');
  }

  // Create a method to retrieve bills using HTTP GET request
  public getBills(): Observable<Bill[]> {
    return this.http
      .get(this.baseUrl + '/bills')
      .map(bills => {
        return bills.map((bill) => {
          const billObj = new Bill(bill);
          return billObj;
        });
      })
      .catch((err)=>{
        console.error(err);
      })

  }

Property 'map' is not recognized on type 'Object' and needs to be addressed

service

Answer №1

Answer №2

Answer №3

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