Adding an item to a list using the PATCH method in Angular 7

Can anyone provide guidance on how to implement the PATCH method for manipulating an array within another array?

ItemClass:

export class ItemClass {
constructor(public person: string, public name: string, public quantity: number, public price: number){}
}

MenuModel:

    import { ItemClass } from './item.model';

    export class MenuModel {


    id: number;
    name: string;
    items: ItemClass[];

    constructor( id: number,  name: string, items: ItemClass[]){

         this.id = id;
         this.name = name;
         this.items = items;
    }
}

I am working on a menu component and service. I am in need of a patch method that can both add and remove elements from the ItemClass[] array inside the MenuModel.

The API method outlined as follows :

   @PATCH
   @Path("/add/{menuId}")
   public void removeMenuItem(
            @PathParam("menuId") final int menuId,
            final Item item) {  // 'Item' refers to the Request Body
      final List<Item> items = this.menuRepository.get(menuId).getItems();
      items.add(item);
   }

(source: )

Answer №1

Exploring the backend's patch method further, here is a simple example of its implementation.

In this scenario, assuming you are using Angular version 7 and HttpClient.

import { HttpClient } from '@angular/common/http'; 
/* ... */ 
export class YourComponentOrService {

  // Note: Ensure HttpClientModule is added to the application module 'imports' and 'providers'
  constructor(private http: HttpClient) {} 

  /* ...*/ 

  // Method to add an item
  public addItem(menuID: number, itemToAdd: ItemClass): void { 
    console.log('Sending patch request to add an item');

    this.http.patch(`example.com/add/{menuId}`, itemToAdd).subscribe(
      res => { 
        console.log('Received ok response from patch request');
      },
      error => {
        console.error('Error during the request');
        console.log(error);
      });

    console.log('Request sent. Waiting for response...');

  }

  // Similar approach can be used for the delete method as mentioned in the linked Q&A
  // Only difference being the use of 'remove' in URL instead of 'add', along with item name and no body.

  /* .... */
}     

This serves as a starting point for you to customize according to your project requirements and Angular architecture.

The key here is understanding the API endpoints and utilizing the patch method from HttpClient service effectively.

Next step would be to implement the logic for sending requests with appropriate parameters.

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