brewman/overlord/src/app/balance-sheet/balance-sheet-resolver.service.ts

import { Injectable } from '@angular/core';
import { ActivatedRouteSnapshot, Resolve } from '@angular/router';
import { Observable } from 'rxjs/internal/Observable';

import { BalanceSheet } from './balance-sheet';
import { BalanceSheetService } from './balance-sheet.service';

@Injectable({
  providedIn: 'root',
})
export class BalanceSheetResolver implements Resolve<BalanceSheet> {
  constructor(private ser: BalanceSheetService) {}

  resolve(route: ActivatedRouteSnapshot): Observable<BalanceSheet> {
    const date = route.paramMap.get('date');
    return this.ser.list(date);
  }
}