gns3-web-ui/src/app/cartography/datasources/links-datasource.ts

import { Injectable } from '@angular/core';

import { DataSource } from './datasource';
import { Link } from '../../models/link';

@Injectable()
export class LinksDataSource extends DataSource<Link> {
  protected getItemKey(link: Link) {
    return link.link_id;
  }
}