room.js

// top of file
import api from '../api';

// bottom of file
export function loadOlderMessages(roomId, params) {
  return (dispatch) => {
    dispatch({ type: 'FETCH_MESSAGES_REQUEST' });
    return api.fetch(`/rooms/${roomId}/messages`, params)
      .then((response) => {
        dispatch({ type: 'FETCH_MESSAGES_SUCCESS', response });
      })
      .catch(() => {
        dispatch({ type: 'FETCH_MESSAGES_FAILURE' });
      });
  };
}