React native Redux useDispatch not working - reactjs

Question

I try to create a Redux and I have a problem when I try to do dispatch is not working.
Action file, userActions.js:
export const setId = () => {
console.log("Enter to set id func");
return {
type: 'SET_ID'
}
}
Reducer file, userReducer.js:
const INITIAL_STATE = {
id: "",
email: "",
name: "",
};
const userReducer = (state = INITIAL_STATE, action) => {
console.log('Enter to userReducer');
switch (action.type) {
case "SET_ID": {
// console.log(action.payload);
}
default: {
return state;
}
}
}
export default userReducer;
combineReducers file:
import userReducer from "./userReducer";
import { combineReducers } from "redux";
const allReducers = combineReducers({
userReducer: userReducer
})
export default allReducers;
App.js file:
import React from 'react';
import Routes from "./Routes";
import { createStore } from "redux";
import allReducer from "./app/reducers";
import { Provider } from "react-redux";
const store = createStore(
allReducer
);
const App = () => {
return (
<Provider store={store}>
<Routes />
</Provider>
);
};
export default App;
In login screen file, I have button when I click on him call to dispatch to "setId" action.
Here some of my code from Login.js:
import { useDispatch } from 'react-redux';
import { setId } from '../actions/userActions';
handleLoginResult = (error, user) => {
console.log('Enter to handleLoginResult');
if (error !== "") {
this.setState({ generalError: error });
} else {
const dispatch = useDispatch();
console.log('uid: ', user.user.uid);
dispatch(setId());
alert("Login!");
}
}
What is the problem and why is not enter to setId action?

Answer 1

You can try with like this
const userReducer = (state = INITIAL_STATE, action) =>dispatch =>{
console.log('Enter to userReducer');
switch (action.type) {
case "SET_ID": {
// console.log(action.payload);
}
default: {
return state;
}
}
}

Answer 2

I didn't quite understand your question, but I'll give you an example of an action of mine
export const register_user = ({ name, email, password, password_confirmation }) => {
return dispatch => {
dispatch(
{
type: CREATE_USER
}
)
let url = "/users"
Axios.post(`${SERVER}${url}`, {
"user": {
"name": name,
"email": email,
"password": password,
"password_confirmation": password_confirmation
}
})
.then(() => {
Alert.alert('Registrado com sucesso!')
registerUserSuccess(dispatch)
})
.catch((err) => {
registerUserError(err, dispatch)
})
}
}
const registerUserSuccess = (dispatch) => {
dispatch(
{
type: CREATE_USER_SUCCESS
}
)
this.props.navigation.navigate('Login')
}
const registerUserError = (err, dispatch) => {
dispatch(
{
type: CREATE_USER_ERROR
}
)
Alert.alert('Algo deu errado, verifique suas credenciais.')
}
The type is exported from my reducer.
And the register_user constant is imported and used on my register screen.

Answer 3

Hooks cannot be used inside a function. They need to declared directly inside the functional component.
Also useDispatch hook cannot be used inside a class component, you must use connect for a class component.
Assuming you have a class component, judging by how you use this.setState, you would write your code like
class Login extends React.Component {
...
handleLoginResult = (error, user) => {
console.log('Enter to handleLoginResult');
if (error !== "") {
this.setState({ generalError: error });
} else {
const dispatch = this.props;
console.log('uid: ', user.user.uid);
dispatch(setId());
alert("Login!");
}
}
...
}
export default connect()(Login)
If however you were to write login as a functional component, you would write it like
const Login = (props) => {
const dispatch = useDispatch();
const [state, setState] = useState({});
...
const handleLoginResult = (error, user) => {
console.log('Enter to handleLoginResult');
if (error !== "") {
setState({ generalError: error });
} else {
console.log('uid: ', user.user.uid);
dispatch(setId());
}
}
...
}