Rematch for Redux: Struggling to see state on different screens

Question

I am new to Rematch for Redux. I am redoing my application using Rematch, but I do not know if I am doing any of this correctly? How/Where do I trigger my reducers and effects (Step 3 in Rematch Docs)? I cannot see my state when I switch between screens. The state seems to be resetting. Could someone please help me? I would greatly appreciate it.

I followed this: https://github.com/rematch/rematch

Here is my code down below:

My application will get bigger, thus the reason why I placed these in different files to build up into the models.js.

store/user.js

const user = {
    state: {},
    reducers: {
        login(payload) { return payload },
        email(state, payload) {
            return { ...state, payload }
        },
        password(state, payload) {
            return { ...state, payload }
        },
        username(state, payload) {
            return { ...state, payload }
        },
        fullname(state, payload) {
            return { ...state, payload }
        },
    }
}

export default user

store/index.js

import { init } from '@rematch/core'
import user from './user'

const models = {
    user,
}

const store = init({
    models,
})

export default store

App.js

import * as React from 'react';
import SwitchNavigator from './navigation/switchNavigator'
import { Provider } from 'react-redux'
import 'redux'
import store from './store/index'

export default class App extends React.Component {
  render() {
    return (
      <Provider store={store}>
        <SwitchNavigator/>
      </Provider>
    );
  }
}

navigation/switchNavigator

import * as React from 'react';
import TabNavigatorScreen from './tabNavigator'
import AuthNavigatorScreen from './authNavigator'
import { createAppContainer } from 'react-navigation';
import { createSwitchNavigator } from 'react-navigation-switch-transitioner'

const switchNavigator = createSwitchNavigator(
  {
    Home: { 
      screen: TabNavigatorScreen
    },
    Auth: { 
      screen: AuthNavigatorScreen
    }
  },
  {
    initialRouteName: 'Auth',
  }
);

export default createAppContainer(switchNavigator);

navigation/authNavigator

import * as React from 'react';
import LoginScreen from '../screens/login'
import SignUpScreen from '../screens/signup'
import MainScreen from '../screens/main'
import { createAppContainer } from 'react-navigation';
import { createStackNavigator } from 'react-navigation-stack';

const authNavigator = createStackNavigator(
  {
    Main: {
      screen: MainScreen,
      navigationOptions: {
        header: null,
      }
    },
    Login: {
      screen: LoginScreen,
      navigationOptions: {
        title: 'Login',
        headerTintColor: '#404040', 
        headerTitleStyle: {
          color: '#404040',
        },
        headerBackTitleStyle: {
          color: '#404040',
        },
        headerBackTitle: null,
      }
    },
    Signup: {
      screen: SignUpScreen,
      navigationOptions: {
        title: 'Sign Up',
        headerTintColor: '#404040',
        headerTitleStyle: {
          color: '#404040',
        },
        headerBackTitleStyle: {
          color: '#404040',
        },
        headerBackTitle: null,
      }
    }
  },
  {
    initialRouteName: 'Main',
  }
);

export default createAppContainer(authNavigator);

screens/signUp

import * as React from 'react';
import {
    TextInput,
    Text,
    KeyboardAvoidingView,
    SafeAreaView,
    TouchableOpacity,
    Alert,
}
    from 'react-native';
import styles from '../styles'
import { connect } from 'react-redux';
import '@expo/vector-icons';
import 'redux';

class Signup extends React.Component {
    render() {
        const { routeName } = this.props.navigation.state
        return (
            <SafeAreaView style={styles.container}>
                <KeyboardAvoidingView behavior='position'>
                    <Text style={styles.mainText}>
                        EMAIL
                    </Text>
                    <TextInput
                        style={styles.inputText}
                        editable={routeName === 'Signup' ? true : false}
                        value={this.props.user.email}
                        onChangeText={input => this.props.email(input)}
                    />
                    <Text style={styles.mainText}>
                        PASSWORD
                    </Text>
                    <TextInput
                        style={styles.inputText}
                        editable={routeName === 'Signup' ? true : false}
                        value={this.props.user.password}
                        onChangeText={input => this.props.password(input)}
                        secureTextEntry={true}
                    />
                    <Text style={styles.mainText}>
                        USERNAME
                    </Text>
                    <TextInput
                        style={styles.inputText}
                        value={this.props.user.username}
                        onChangeText={input => this.props.username(input)}
                    />
                    <Text style={styles.mainText}>
                        FULL NAME
                    </Text>
                    <TextInput
                        style={styles.inputText}
                        value={this.props.user.fullname}
                        onChangeText={input => this.props.fullName(input)}
                    />
                    <TouchableOpacity
                        style={styles.buttonLighGray}
                        onPress={() => Alert.alert('Sign up')}>
                        <Text style={styles.buttonDarkText}>
                            Accept & Sign Up
                        </Text>
                    </TouchableOpacity>
                </KeyboardAvoidingView>
            </SafeAreaView>
        );
    }
}

const mapState = (state) => ({
    user: state.user,
})

const mapDispatch = ({ user: { email, password, username, fullname }}) => ({
    email: () => email(),
    password: () => password(),
    username: () => username(),
    fullname: () => fullname(),
})

export default connect(mapState, mapDispatch)(Signup)

The Login screen is using the same state as Sign up screen.

Tobias Lins · Accepted Answer · 2019-09-15T15:34:39.820

The state will never change because you don't pass any parameters while dispatching an action.

const mapDispatch = dispatch => ({
  setEmail: mail => dispatch.user.email(mail)
})

Everytime you called a function before you just invoked the reducer without a parameter.

Regarding your rematch model. Your reducers should not just return ...state & payload. Try to

const user = {
    state: {},
    reducers: {
        email(state, email) {
            return { ...state, email }
        },
        password(state, password) {
            return { ...state, password }
        },
        username(state, username) {
            return { ...state, username }
        },
        fullname(state, fullname) {
            return { ...state, fullname }
        },
    }
}

Rematch for Redux: Struggling to see state on different screens

1 Answers1