text: import _ from 'lodash';
  import { FETCH_POSTS, FETCH_POST, DELETE_POST } from '../actions';
  
  export default function(state = {}, action) {
    switch(action.type) {
      case DELETE_POST:
        return _.omit(state, action.payload); //new state without the post deleted
      case FETCH_POSTS:
        return _.mapKeys(action.payload.data, 'id');
      case FETCH_POST:
        // const post =  action.payload.data;
        // const newState = { ...state };
        // newState[post.id] = post;
        // return newState;
        return { ...state, [action.payload.data.id]: action.payload.data };
      default:
        return state;
    }
  }