purchase-contract.effects.ts

addProduct$ = createEffect(() =>
    this.actions$.pipe(
      ofType(PurchaseContractActions.createPurchaseContractSuccess),
      switchMap((payload) => {

        return this.productSrv.loadPurchaseContract(payload.address).pipe(
          tap(product => console.log('purchase contract:', product)),
          map(product => PurchaseContractActions.addProduct({product})),
          
          catchError((err: Error) =>
            of(ErrorActions.errorMessage({ errorMsg: err.message }))
          )
        );
      })
    )
  );