notifcaitonsender.js

// ActivityView.js
notificationSender(notificationTypes.USER_UNJOINED_ACTIVITY_USER, {
  payload: { activity },
  sender: userId
});

notificationSender(notificationTypes.USER_UNJOINED_ACTIVITY_COACH, {
  payload: { activityId: activity._id },
  sender: userId,
  reciever: activity.coachId
});

// notficationHandler.js
export const notificationSender = (notificationType, { sender, reciever, payload }) => {
  switch(notificationType) {
    case types.USER_JOINED_ACTIVITY_COACH:
      break;

    case types.USER_JOINED_ACTIVITY_USER:
      break;

    case types.USER_UNJOINED_ACTIVITY_COACH:
      userUnjoinedActivity(notificationType, { sender, reciever, payload });
      break;

    case types.USER_UNJOINED_ACTIVITY_USER:
      userUnjoinedActivity(notificationType, { sender, reciever, payload });
      break;

    case types.USER_ENQUIRED_PACKAGE_COACH:
      break;

    default:
      break;
  }
};

// notificationMethods.js
export function userUnjoinedActivity(notificationType, { sender, reciever, payload }) {
  const userId = user._id;

  if (notificationType === types.USER_UNJOINED_ACTIVITY_USER)
    // send notification to user
    Notification.insert({
      createdBy: sender,
      targetId: sender,
      type: notificationType,
      data: payload.activity,
      message: `Du har afmeldt dig fra ${payload.activity.title}`,
      activityId: payload.activity._id
    });
  } else {
    // send notification to coach
    Notification.insert({
      createdBy: sender,
      targetId: reciever,
      type: notificationType,
      data: payload.activity,
      message: `Du har afmeldt dig fra ${payload.activity.title}`,
      activityId: payload.activity._id
    });
  }
}