text: import {FETCH_POSTS, FETCH_POST, DELETE_POST} from '../actions';
  import _ from 'lodash';
  
  export default function(state = {}, action) {
      switch(action.type) {
          case FETCH_POSTS:
              return _.mapKeys(action.payload.data, 'id');
          case FETCH_POST:
              return { ...state, [action.payload.data.id]: action.payload.data };
          case DELETE_POST:
              return _.omit(state, action.payload);
          default:
              return state;
      }
  }