Refactoring Reducer - Second Version

reducer.v2.js

import schema from './schema';
import { ACTIONS } from './action';

export default (state = schema, action) => {
  switch (action.type) {

    case ACTIONS.FETCHING_LIST:
      return {
        ...state,
        list: {
          value: [],
          fetching: true
        }
      };

    case ACTIONS.FETCHING_HEADER:
      return {
        ...state,
        header: {
          value: {},
          fetching: true
        }
      };

    case ACTIONS.FETCHING_ITEM:
      return {
        ...state,
        selected: {
          value: {},
          fetching: true
        }
      };

    case ACTIONS.UNSELECT_ITEM:
      return {
        ...state,
        selected: {
          value: {},
          fetching: false
        }
      };

    case ACTIONS.FETCH_LIST_COMPLETE:
      return {
        ...state,
        list: {
          value: action.list,
          fetching: false
        }
      };

    case ACTIONS.FETCH_ITEM_COMPLETE:
      return {
        ...state,
        selected: {
          value: action.value,
          fetching: false
        }
      };

    case ACTIONS.FETCH_HEADER_COMPLETE:
      return {
        ...state,
        header: {
          value: action.value,
          fetching: false
        }
      };

    case ACTIONS.ERROR:
      return {
        ...state,
        isError: true,
        errorMessage: action.errorMessage
      };

    case ACTIONS.POSTING:
      return {
        ...state,
        isPosting: true
      };

    case ACTIONS.CREATED:
      return {
        ...state,
        isPosting: false
      };

    case ACTIONS.UPDATED:
      return {
        ...state,
        isPosting: false
      };

    default:
      return state;
  }
};