React + Redux + Axios not loading component after actions is created

Question

I am trying to consume an API that I have created, I have followed a code that I have used before but when the component is loaded, as the json list is empty, it shows and empty list, I can see in the log that the list is being loaded afterwards but no refresh or anything on the component. I tried to add a validation that if the length of the list is cero just not print anything but this leads to an error. I can guess that there is an issue regarding the middleware (I am using redux-promise). As you can see I have added the middleware on the application definition, I can't see what its missing Any ideas? Here is my code:

actions/index.js:

import axios from 'axios';

export const FETCH_TESTS = 'FETCH_TESTS';
const ROOT_URL = 'http://some-working-api-entry.com';

export function fetchTests(){
  const request = axios.get(`${ROOT_URL}/tests/?format=json`);
  return {
    type: FETCH_TESTS,
    payload: request
  }
}

reducers/reducer_tests.js

import { FETCH_TESTS } from '../actions/index';

export default function(state = [], action){
  switch (action.type) {
    case FETCH_TESTS:
      return [action.payload.data, ...state]; //ES6 syntaxis\   

 }
 return state;
}

actions/index.js

import { combineReducers } from 'redux';
import TestsReducer from './reducer_tests';

const rootReducer = combineReducers({
  tests: TestsReducer
});

export default rootReducer;

containers/list_tests.js

import _ from 'lodash';
import React, { Component } from 'react';
import { connect } from 'react-redux';
import { fetchTests } from '../actions';

class TestList extends Component{

    componentDidMount(){
        this.props.fetchTests();
    }

    renderTest(){
      return _.map(this.props.tests, test => {
        return (
          <tr key={test.id}>
            <td>{test.id}</td>
            <td>{test.col1}</td>
            <td>{test.col2}</td>
            <td>{test.col3}</td>
            <td>{test.col4}</td>
        </tr>
        );
      });
  }

  render(){
    return (
      <table className="table table-hover">
        <thead>
          <tr>
            <th>ID</th>
            <th>Col 1</th>
            <th>Col 2</th>
            <th>Col 3</th>
            <th>Col 4</th>
          </tr>
        </thead>
        <tbody>
          { this.renderTest() }
        </tbody>
      </table>
    );
  }
}

function mapStateToProps(state){
    return {tests: state.tests}
  }
//export default connect(mapStateToProps)(TestList)
export default connect(mapStateToProps, { fetchTests})(TestList);

index.js

import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';
import registerServiceWorker from './registerServiceWorker';
import { Provider } from 'react-redux';
import { createStore, applyMiddleware } from 'redux';
import ReduxPromise from 'redux-promise';

import reducers from './reducers';

const createStoreWithMiddleware = applyMiddleware(ReduxPromise)(createStore);

ReactDOM.render(
    <Provider store={createStoreWithMiddleware(reducers)}>
      <App />
    </Provider>
    , document.getElementById('root'));

package.json

{
  "name": "someapp",
  "version": "0.1.0",
  "private": true,
  "dependencies": {
    "axios": "^0.18.0",
    "react": "^16.3.2",
    "react-dom": "^16.3.2",
    "react-redux": "^5.0.7",
    "react-scripts": "1.1.4",
    "redux": "^4.0.0",
    "redux-logger": "^3.0.6",
    "redux-promise": "^0.5.3",
  },
  "scripts": {
    "start": "react-scripts start",
    "build": "react-scripts build",
    "test": "react-scripts test --env=jsdom",
    "eject": "react-scripts eject"
  }
}

EDIT: From the action creator (the array contains the only object on the api list entrypoint):

config: Object { timeout: 0, xsrfCookieName: "XSRF-TOKEN", xsrfHeaderName: "X-XSRF-TOKEN", … }
​
data: Array [ {…} ]
​
headers: Object { "content-type": "application/json" }
​
request: XMLHttpRequest { readyState: 4, timeout: 0, withCredentials: false, … }

​ status: 200 ​ statusText: "OK" ​ proto: Object { … }

from reducer:

payload:[object Object]

If I log the tests props on the container, first it logs an empty array [] then it logs an array of length 1

Answer 1

You have to call dispatcher to update store.

In containers/list_tests.js

const mapDispatchToProp = dispatch => ({
      fetchTests : () => dispatch(fetchTests())
})

export default connect(mapStateToProps, mapDispatchToProp )(TestList);

EDIT 1: Found another issue.

export function fetchTests(){
  return axios.get(`${ROOT_URL}/tests/?format=json`)
       .then(res => {
             return {
                type: FETCH_TESTS,
                 payload: res.data
              }
        });

}

Answer 2

const request = axios.get(`${ROOT_URL}/tests/?format=json`);
 // here is your issue because axios returns promise.

Create a doGet method like this.

export function doGet(url, onSuccess, onFailure) {

        return axios.get(url)
            .then((response) => {
                if (onSuccess) {
                    onSuccess(response);
                }

                return response.data || {};
            })
            .catch((error) => {
                if (onFailure) {
                    onFailure(error);
                }
            });
    }

And call this method on your componentDidMount like:

doGet(
   'your/api/url',
   (response) => console.log('Api success callback', response),
   (error) => console.log('error callback', error)
)