react+redux+api,how to add a reducer

The process of adding a reducer in the react.
1.First define the action，including the defination of the action types in the type file, returning the promise;

    export const getArticleCount = () =>{
      return (dispatch,getState) => {
        const options = getState().options.toJS()
        return dispatch({
          type: types.ARTICLE_COUNT,
          promise: api.getArticleCount(options)
        })
      }
    }

2.then define the API function,should be accord to backend controler name;

    getArticleCount:function(options){
        return ArticleResource('get', 'getFrontArticleCount', null, {params:options})
      },

3.the returning data should through the promiseMiddleware,the name is json;

    export default function promiseMiddleware() {
      return next => action => {
        const { promise, type, ...rest } = action
        if (!promise) return next(action)
        const SUCCESS = type + '_SUCCESS'
        const REQUEST = type + '_REQUEST'
        const FAILURE = type + '_FAILURE'
        next({ ...rest, type: REQUEST })
        return promise
          .then(response => ({json: response.data, status: response.statusText}))
          .then(({json,status}) => {
            if(status !== 'OK'){
              const error = json
              next({ ...rest, error, type: FAILURE })
              return false
            }
            next({ ...rest, json, type: SUCCESS })
            return true
          })
          .catch(error => {
            next({ ...rest, error, type: FAILURE })
            return false
          })
      }
    }

4.then in the reducer file, define the according export const，

    export const articlecount = createReducer(initialState,{
      [ARTICLE_COUNT_SUCCESS]:  (state,action) => state.merge(fromJS(action.json)),
      [ARTICLE_COUNT_FAILURE]: (state) => state
    })

5.the most important one is that in the index.js,you should add the reducer into the rootReducer,so that it can be export.

    const rootReducer = combineReducers({
      articleDetail,
      articlecount,
      routing: routerReducer,
      form: formReducer
    })

6.The next one should be how to use the state as props in the component:

    const mapStateToProps = state =>{
      return {
        articleCount: state.articlecount.toJS()
      }
    }
    @connect(mapStateToProps,mapDispatchToProps)
    export default class Home extends Component {
      constructor(props){
        super(props)
      }
      static propTypes = {
        articleCount: PropTypes.object.isRequired
      }
      static fetchData(params){
        return [Actions.getArticleList(),Actions.getTagList(),Actions.getArticleCount()]
      }
      componentDidMount() {
        const { actions,tagList,articleList } = this.props
        Actions.getArticleCount()
        if(tagList.length < 1){
          actions.getTagList()
        }
        if(articleList.items.length < 1){
          actions.getArticleList()
        }
      }
      handleChange(e,option,isAdd=false){
        e.preventDefault()
        const { actions } = this.props
        actions.changeOptions(option)
        actions.getArticleList(option)
        actions.getArticleCount(option)
      }
      render() {
        const { globalVal,tagList,articleList,options,articleCount } = this.props
        return (
           /……./
        )
      }