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Logout User

Hilton Meyer
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Originally published at hiltonmeyer.com on ・2 min read

Code for this can be found in the Github Branch

The final step in wrapping up auth before getting back to the ingredients form is being able to log a user out of the application. Again firebase does the heavy lifting and all we need to do is make sure our state is updated.

Store #

The store needs to be refactored and updated after I noticed a few issues. The first is that the user details can be stored as an Object for easier use in the app called currentUser.

store/auth/authIndex.js

import authActions from './authActions.js';
import authMutations from './authMutations';
import authGetters from './authGetters';

export default {
  namespaced: true,
  state() {
    return {
      currentUser: { id: 0, username: '', email: '' },
      registrationError: false,
      isLoggedIn: false,
      errorMsg: '',
    };
  },
  mutations: authMutations,
  actions: authActions,
  getters: authGetters,
};

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Below you can see the use of firebase to sign out the user from the system. The snippet below is without the full code for register and login. Take a look at the repo for full code.

store/auth/authActions.js

import firebase from '@/firebase.js';

const userRef = firebase.firestore().collection('/user');

export default {
  async register({ commit }, user) {
    ...
  },
  async login({ commit }, user) {
    ...
  },
  async logout({ commit }) {
    await firebase.auth().signOut();
    commit('logout');
  },
};

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Our mutation now has to update the state of the user being logged out. I also refactor the currentUser data in both the logout and authSuccess.

store/auth/authMutations.js

import router from '@/router';

export default {
  authSuccess(state, user) {
    state.currentUser.id = user.uid;
    state.currentUser.email = user.email;
    state.currentUser.username = user.username;
    state.registrationError = false;
    state.isLoggedIn = true;
    state.errorMsg = '';
    router.push({ name: 'home' });
  },
  authFail(state, error) {
    state.registrationError = true;
    state.isLoggedIn = false;
    state.errorMsg = error.message;
  },
  logout(state) {
    state.isLoggedIn = false;
    state.currentUser.id = null;
    state.currentUser.email = null;
    state.currentUser.username = null;
    router.replace({ name: 'home' });
  },
};

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Implement #

With this done we complete the logout functionality and now just need to use the action after clicking the button.

components/ui/TheHeader.vue

<template>
  <img
    alt="App logo"
    src="https://res.cloudinary.com/hiltonmeyer-com/image/upload/v1611488325/pantry/cooking-robot_xdaw7k.png"
  />
  <div id="nav">
    <router-link to="/">Home</router-link>
    <router-link v-if="isLoggedIn" to="/ingredients"> Ingredients</router-link>
  </div>
  <div id="auth">
    <router-link v-if="!isLoggedIn" to="/login" tag="button">
      <button>Login</button>
    </router-link>
    <router-link v-if="!isLoggedIn" to="/register">
      <button>Register</button>
    </router-link>
    <button v-if="isLoggedIn" @click.prevent="logout">Logout</button>
  </div>
</template>

<script>
import { mapGetters, mapActions } from 'vuex';

export default {
  computed: {
    ...mapGetters('auth', ['isLoggedIn']),
  },
  methods: {
    ...mapActions('auth', ['logout']),
  },
};
</script>

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