Redux-thunk dispatch not working - reactjs

Question

I am looking at thunk and trying to figure out how to implement an api call. It is not working so I have gone back to the very basics. When I click on the button it shows 'Getting here! in the console, but nothing is showing when I console.log(dispatch). Am I missing something here?
import React from 'react';
import ReactDOM from 'react-dom';
import { createStore, applyMiddleware } from 'redux';
import { connect, Provider } from 'react-redux';
import thunk from 'redux-thunk'
import axios from 'axis';
const store = createStore(
reducer,
applyMiddleware(thunk)
);
function fetchUser() {
return axios.get('https://randomuser.me/api/');
}
function addUser() {
console.log('Getting here');
return (dispatch) => {
console.log(dispatch) //not showing anything
return fetchUser().then(function(data){
console.log(data);
});
};
}
class App extends React.Component {
addUser() {
addUser();
}
render() {
return (
<button onClick={this.addUser.bind(this)}>+</button>
)
}
}
const mapPropsToState = function(store){
return {
newState: store
}
}
var ConnectApp = connect(mapPropsToState)(App);
ReactDOM.render(
<Provider store={store}>
<ConnectApp />
</Provider>,
document.getElementById('app')
)

Answer 1

You cannot call addUser() from your component as a regular function. You have to use a mapDispatchToProps function and pass it to your connect call in order to be able to dispatch addUser().
const mapDispatchToProps = dispatch => ({addUser: () => dispatch(addUser())})
then
ConnectApp = connect(mapPropsToState, mapDispatchToProps)(App);
Now you can call it as a prop.
addUser() {
this.props.addUser();
}

Answer 2

You're not actually dispatching the thunk. You're calling it directly. You need to pass the inner () => {} thunk function to dispatch.
There's several ways to handle this. Since you're not providing a mapDispatchToProps argument to connect, the App component will automatically be given this.props.dispatch(). So, in App.addUser(), you could do this.props.dispatch(addUser()).
Another way would be to pre-bind the addUser action creator. You could do this with the syntax var ConnectApp = connect(mapPropsToState, {addUser})(App). Then, when you call this.props.addUser(), it will automatically dispatch the result.
I have some discussion on use of action creators and binding at http://blog.isquaredsoftware.com/2016/10/idiomatic-redux-why-use-action-creators/ , and a couple gists with sample code for binding and dispatching at https://gist.github.com/markerikson/6c7608eee5d2421966d3df5edbb8f05c and https://gist.github.com/markerikson/f46688603e3842af0f9720dea05b1a9e .

Answer 3

If you do not want to use connect function then you can use useDispatch() hook.
const dispatch = useDispatch();
useEffect(() => {
dispatch(addUser())
}, [])
You can use componentDidMount or UseEffect to fetch data.