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);  //payload: id of deleted post
      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};
      case FETCH_POSTS:
        return _.mapKeys(action.payload.data, 'id');
      default:
      return state
    }
  }