NgRx调度行动生效并采取一个(?)

@Effect()
authSignin = this.actions$
    .pipe(
        ofType(AuthActions.TRY_SIGNIN),
        map((action: AuthActions.TrySignin) => {
            console.log('AuthEffects -> authSignin');
            return action.payload;
        }),
        switchMap((data: any) => {
            this.router.navigate(['/student']);
            const user: User = {
                id: '1',
                firstName: 'John',
                lastName: 'Doe',
                pesel: '19827364',
                dateOfBirth: new Date(),
                address: 'Canada, where clone syrup is made',
                phoneNumber: '14 2345 345'
            }
            return [
                { type: AuthActions.TRY_SIGNIN },
                { type: UserActions.SET_USER, payload: user }
            ]
        })
    )

所以问题又来了: 有没有办法只获取一次用户凭据的值,并留下常规行为来检查身份验证?

任何暗示都会很有帮助。非常感谢。