Sometime ago I did a tutorial on How to Build a GraphQL Server with Apollo Server and AdonisJS.

In this tutorial, I'll be showing how to build a blog that will make use of the GraphQL server built in that tutorial. We'll build the blog app using Apollo client and VueJS.

You can grab the GraphQL server so you can follow along with the tutorial. If you followed along from the previous tutorial, you will also need to grab the code as I have made some few changes to suit this tutorial.

Enabling CORS

The GraphQL server was built with AdonisJS. AdonisJS makes dealing with Cross-Origin Resource Sharing(CORS) a breeze, as it provide a package which we can use to handle CORS on our API. By default CORS is turned off on AdonisJS, so we need to enable it. To enable CORS on AdonisJS app, we simply set origin to true in config/cors.js as below:

// config/cors.js

// allow current request origin
origin: true

Though the cloned GraphQL server has CORS already enabled, but it's worth mentioning it.

Starting the GraphQL Server

Since our blog app will be making use of the GraphQL server, we'll need to start the server and keep it running for the rest of the tutorial. To do start, we'll cd into the GraphQL server project (the one cloned from above) directory and run the command below:

adonis serve --dev

This will start the GraphQL server and keep it running.

The rest of the tutorial assumes you already started the GraphQL server and it is running.

With that taken care of, let's start building our blog app.

Create a Vue App

We'll start by creating a new Vue app using the Vue CLI:

vue init webpack graphql-blog-app
// select `Y` to use Vue router

This will create a new Vue app with the name graphql-blog-app and install it dependencies.

Installing Necessary Packages

With the app created, we can move on to installing the necessary packages for building our GraphQL blog app:

cd graphql-blog-app
npm install --save vue-apollo@next graphql apollo-client apollo-link apollo-link-context apollo-link-http apollo-cache-inmemory graphql-tag

Let's quickly go over each package:

  • vue-apollo: An Apollo/GraphQL integration for VueJS. We install the latest version of the plugin which allows us to use all the great features that comes with Apollo client 2.0.
  • graphql: A reference implementation of GraphQL for JavaScript.
  • apollo-client: A fully-featured, production ready caching GraphQL client for every server or UI framework.
  • apollo-link: A standard interface for modifying control flow of GraphQL requests and fetching GraphQL results.
  • apollo-link-context: Used to easily set a context on your operation, which is used by other links further down the chain.
  • apollo-link-http: Used to get GraphQL results over a network using HTTP fetch.
  • apollo-cache-inmemory: Cache implementation for Apollo Client 2.0.
  • graphql-tag: A JavaScript template literal tag that parses GraphQL queries.

Setting Up Vue Apollo

Next, let's put the packages to use. We'll start by creating an ApolloClient instance and install the VueApollo plugin. Open src/main.js and add the code below to it:

// src/main.js

import { ApolloClient } from 'apollo-client'
import { HttpLink } from 'apollo-link-http'
import { InMemoryCache } from 'apollo-cache-inmemory'
import VueApollo from 'vue-apollo'

const httpLink = new HttpLink({
    // URL to graphql server, you should use an absolute URL here
    uri: 'http://localhost:3333/graphql'
})

// create the apollo client
const apolloClient = new ApolloClient({
    link: httpLink,
    cache: new InMemoryCache()
})

// install the vue plugin
Vue.use(VueApollo)

We create a new instance of httpLink with the URL (mine is http://localhost:3333/graphql) of our GraphQL server. Then we create an Apollo client using the httpLink created above and specify we want an in memory cache. Lastly, we install the Vue Apollo plugin.

Next, let's create a apolloProvider object which we'll specify on our root component:

// src/main.js

const apolloProvider = new VueApollo({
  defaultClient: apolloClient
})

// update Vue instance by adding `apolloProvider`
new Vue({
    el: '#app',
    router,
    apolloProvider,
    template: '<App/>',
    components: { App }
})

We create a new instance of the Vue Apollo plugin using the apolloClient created as our default client. Lastly, we make use of the apolloProvider object by adding it in our Vue instance, same way we would use Vue router.

Adding Bulma

For the purpose of this tutorial, we'll be using Bulma CSS. So, let's add it in. Open index.html and update as below:

// index.html

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width,initial-scale=1.0">
    <title>GraphQL Blog App</title>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bulma/0.6.1/css/bulma.min.css">
</head>
<body>
    <div id="app"></div>
    <!-- built files will be auto injected -->
</body>
</html>

We reference Bulma on CDN.

Removing Unused Code

There are some files and code that came along when we created our Vue app which we won't be using in this tutorial. Let's remove them so they won't interfere with our app. Delete the Hello component and remove all it references from src/router/index.js.

Adding Master Layout

The blog will use a generic layout across it pages. In that case, let's define a layout that all pages will use. To do this, open src/App.vue and update as below:

// src/App.vue

<template>
    <div id="app">
        <nav class="navbar is-primary" role="navigation" aria-label="main navigation">
            <div class="container">
                <div class="navbar-brand">
                    <router-link class="navbar-item" to="/">Blog App</router-link>

                    <button class="button navbar-burger">
                        <span></span>
                        <span></span>
                        <span></span>
                    </button>
                </div>
            </div>
        </nav>
        <router-view/>
    </div>
</template>

<script>
export default {
    name: 'app'
}
</script>

We add a header that all pages will use.

User Signup

Users should be able to signup to our blog app. We'll create a SignUp component that will handle that. So, within src/components create a new Admin folder. All admin related components will be created insider this folder.

Before we create the SignUp component, let's create a dedicated file that will hold all our GraphQL queries and mutations. We'll create this file directly inside src. Create a graphql.js file inside src and paste the code below into it:

// src/graphql.js

import gql from 'graphql-tag'

export const SIGNUP_MUTATION = gql`
    mutation SignupMutation($username: String!, $email: String!, $password: String!) {
        createUser(
            username: $username,
            email: $email,
            password: $password
        ) {
            id
            username
            email
        }
    }
`

This is the GraphQL mutation that will handle creating new user on our GraphQL server. It takes the username, email and password of a user. These variables will be passed from the SignUp component.

Next, let's create the SignUp component. Within the Admin folder, create a SignUp.vue file and paste the code below into it:

// src/components/Admin/SignUp.vue

<template>
    <section class="section">
        <div class="columns">
            <div class="column is-4 is-offset-4">
                <h2 class="title has-text-centered">Signup</h2>

                <form method="POST" @submit.prevent="signup">
                    <div class="field">
                        <label class="label">Username</label>

                        <p class="control">
                            <input
                                type="text"
                                class="input"
                                v-model="username">
                        </p>
                    </div>

                    <div class="field">
                        <label class="label">E-Mail Address</label>

                        <p class="control">
                            <input
                                type="email"
                                class="input"
                                v-model="email">
                        </p>
                    </div>

                    <div class="field">
                        <label class="label">Password</label>

                        <p class="control">
                            <input
                                type="password"
                                class="input"
                                v-model="password">
                        </p>
                    </div>

                    <p class="control">
                        <button class="button is-primary is-fullwidth is-uppercase">SignUp</button>
                    </p>
                </form>
            </div>
        </div>
    </section>
</template>

<script>
import { SIGNUP_MUTATION } from '@/graphql'

export default {
    name: 'SignUp',
    data () {
        return {
            username: '',
            email: '',
            password: ''
        }
    },
    methods: {
        signup () {
            this.$apollo
                .mutate({
                    mutation: SIGNUP_MUTATION,
                    variables: {
                        username: this.username,
                        email: this.email,
                        password: this.password
                    }
                })
                .then(response => {
                    // redirect to login page
                    this.$router.replace('/login')
                })
            }
        }
    }
</script>

This component renders a simple form for users to signup. Once the form is submitted, a signup method is called. Within the signup method, we make use of mutate method avaiable on this.$apollo (from the Vue Apollo plugin). We use the SIGNUP_MUTATION mutation created earlier and pass along the necessary variables. Once the signup process is successful (that is, the user has been created), we redirect the user to login page (which we'll create shortly).

Adding Signup Route

Open src/router/index.js, and add the code below to it:

// src/router/index.js

import SignUp from '@/components/Admin/SignUp'

// add these inside the `routes` array
{
    path: '/signup',
    name: 'SignUp',
    component: SignUp
},

Now when we visit the /signup route, we should see our signup form as in the image below:

User Login

Let's add ability for users to login. Just as we did with user signup, let's first create the GraphQL mutation. Add the code below to src/graphql.js:

// src/graphql.js

export const LOGIN_MUTATION = gql`
    mutation LoginMutation($email: String!, $password: String!) {
        login(
            email: $email,
            password: $password
        )
    }
`

This is the GraphQL mutation handles user login to our GraphQL server. It takes the email and password of a user.

Next, within the Admin folder, create a LogIn.vue file and paste the code below into it:

// src/components/Admin/LogIn.vue

<template>
    <section class="section">
        <div class="columns">
            <div class="column is-4 is-offset-4">
                <h2 class="title has-text-centered">Login</h2>

                <form method="POST" @submit.prevent="login">
                    <div class="field">
                        <label class="label">E-Mail Address</label>

                        <p class="control">
                            <input
                                type="email"
                                class="input"
                                v-model="email">
                        </p>
                    </div>

                    <div class="field">
                        <label class="label">Password</label>

                        <p class="control">
                            <input
                                type="password"
                                class="input"
                                v-model="password">
                        </p>
                    </div>

                    <p class="control">
                        <button class="button is-primary is-fullwidth is-uppercase">Login</button>
                    </p>
                </form>
            </div>
        </div>
    </section>
</template>

<script>
import { LOGIN_MUTATION } from '@/graphql'

export default {
    name: 'LogIn',
    data () {
        return {
            email: '',
            password: ''
        }
    },
    methods: {
        login () {
            this.$apollo
                .mutate({
                    mutation: LOGIN_MUTATION,
                    variables: {
                        email: this.email,
                        password: this.password
                    }
                })
                .then(response => {
                    // save user token to localstorage
                    localStorage.setItem('blog-app-token', response.data.login)

                    // redirect user
                    this.$router.replace('/admin/posts')
                })
        }
    }
}
</script>

This component renders a simple form for users to login. Once the form is submitted, a login method is called. Within the login method, we make use of mutate method. We use the LOGIN_MUTATION mutation created earlier and pass along the necessary variables. Once the login process is successful, we save the token gotten from our GraphQL server to localstorage and redirect the user.

Adding Login Route

Open src/router/index.js, and add the code below to it:

// src/router/index.js

import LogIn from '@/components/Admin/LogIn'

// add these inside the `routes` array
{
    path: '/login',
    name: 'LogIn',
    component: LogIn
},

Now when we visit the /login route, we should see our login form as in the image below:

Creating Menu Component

Before we start fleshing out the admin-ish part of our blog, let's create a Menu component which will server as the sidebar navigational menu. Within the Admin folder, create a Menu.vue file and paste the code below into it:

// src/components/Admin/Menu.vue

<template>
    <aside class="menu">
        <p class="menu-label">Post</p>
        <ul class="menu-list">
            <li>
            <router-link to="/admin/posts/new">New Post</router-link>
            </li>
            <li>
            <router-link to="/admin/posts">Posts</router-link>
            </li>
        </ul>
        <p class="menu-label">User</p>
        <ul class="menu-list">
            <li>
                <router-link to="/admin/users">Users</router-link>
            </li>
        </ul>
    </aside>
</template>

This simply renders links to some admin sections of out blog app.

Displaying Users

On the admin section, we want to be able to see list users that has been created. For that, we'll created a Users component. But first, let's write the GraphQL query that will fetch all users created. Add the code below to src/graphql.js:

// src/graphql.js

export const ALL_USERS_QUERY = gql`
    query AllUsersQuery {
        allUsers {
            id
            username
            email
        }
    }
`

This GraphQL query fetches all users from our GraphQL server.

Next, let's create the Users component. Within the Admin folder, create a Users.vue file and paste the code below into it:

// src/components/Admin/Users.vue

<template>
    <section class="section">
        <div class="container">
            <div class="columns">
                <div class="column is-3">
                    <Menu/>
                </div>
                <div class="column is-9">
                    <h2 class="title">Users</h2>

                    <table class="table is-striped is-narrow is-hoverable is-fullwidth">
                        <thead>
                            <tr>
                                <th>Username</th>
                                <th>Email</th>
                                <th></th>
                            </tr>
                        </thead>
                        <tbody>
                            <tr
                                v-for="user in allUsers"
                                :key="user.id">
                                    <td>{{ user.username }}</td>
                                    <td>{{ user.email }}</td>
                                    <td>
                                        <router-link :to="`/admin/users/${user.id}`">View</router-link>
                                    </td>
                            </tr>
                        </tbody>
                    </table>
                </div>
            </div>
        </div>
    </section>
</template>

<script>
import Menu from '@/components/Admin/Menu'
import { ALL_USERS_QUERY } from '@/graphql'

export default {
    name: 'Users',
    components: {
        Menu
    },
    data () {
        return {
            allUsers: []
        }
    },
    apollo: {
        // fetch all users
        allUsers: {
            query: ALL_USERS_QUERY
        }
    }
}
</script>

We make use of the Menu component created earlier. Then we define our data which will be populated once the data is gotten from our GraphQL server. Within the apollo object, we add our GraphQL query to fetch all users. This makes use of the ALL_USERS_QUERY we created above. It is important to note that, the name of our data (allUsers in this case) must be the same name used in our GraphQL query (allUsers in this case). Once allUsers is populated with data from our GraphQL server, we display the users in a table by looping through the array of users. We also add a link to view each user details.

Adding Users Route

Open src/router/index.js, and add the code below to it:

// src/router/index.js

import Users from '@/components/Admin/Users'

// add these inside the `routes` array
{
    path: '/admin/users',
    name: 'Users',
    component: Users
},

Now when we visit the /admin/users route, we should see a list of users as in the image below:

Viewing User Details

In the last section, we add a link to view user details. Now, let's implement it. Add the code below to src/graphql.js:

// src/graphql.js

export const USER_QUERY = gql`
    query UserQuery($id: Int!) {
        user(id: $id) {
            id
            username
            email
            posts {
                id
            }
        }
    }
`

This GraphQL query fetches a user by it ID from our GraphQL server. It takes the ID of the user as an argument. The user ID will be passed from the UserDetails component.

Next, let's create the UserDetails component. Within the Admin folder, create a UserDetails.vue file and paste the code below into it:

// src/components/Admin/UserDetails.vue

<template>
    <section class="section">
        <div class="container">
            <div class="columns">
                <div class="column is-3">
                    <Menu/>
                </div>
                <div class="column is-9">
                    <h2 class="title">User Details</h2>

                    <div class="field is-horizontal">
                        <div class="field-label is-normal">
                            <label class="label">Username</label>
                        </div>
                        <div class="field-body">
                            <div class="field">
                                <p class="control">
                                    <input class="input is-static" :value="user.username" readonly>
                                </p>
                            </div>
                        </div>
                    </div>

                    <div class="field is-horizontal">
                        <div class="field-label is-normal">
                            <label class="label">Email Address</label>
                        </div>
                        <div class="field-body">
                            <div class="field">
                                <p class="control">
                                    <input class="input is-static" :value="user.email" readonly>
                                </p>
                            </div>
                        </div>
                    </div>

                    <div class="field is-horizontal">
                        <div class="field-label is-normal">
                            <label class="label">Number of posts</label>
                        </div>
                        <div class="field-body">
                            <div class="field">
                                <p class="control">
                                    <input class="input is-static" :value="user.posts.length" readonly>
                                </p>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </section>
</template>

<script>
import Menu from '@/components/Admin/Menu'
import { USER_QUERY } from '@/graphql'

export default {
    name: 'UserDetails',
    components: {
        Menu
    },
    data () {
        return {
            user: '',
            id: this.$route.params.id
        }
    },
    apollo: {
        // fetch user by ID
        user: {
            query: USER_QUERY,
            variables () {
                return {
                    id: this.id
                }
            }
        }
    }
}
</script>

We display the specified user's username, email and number of posts created. The USER_QUERY accept the ID of the user we want to view his/her details. The user ID is gotten from the route params. That is, given /admin/users/12, 12 is the ID of a particular user. We need a way to pass this ID to our query. To do this, we make use of reactive parameter by defining a variables function that returns an object containing the user ID.

Adding User Details Route

Open src/router/index.js, and add the code below to it. This route should be below all the previous routes:

// src/router/index.js

import UserDetails from '@/components/Admin/UserDetails'

// add these inside the `routes` array
{
    path: '/admin/users/:id',
    name: 'UserDetails',
    component: UserDetails,
    props: true
},

We should be able to view a particular user detail now:

Authorizing User

Only authenticated users can add new post. So, we need a way to pass an Authorization header with the user token along with the request to add new post which will signify the user can actually add new post. With apollo-link-context, we can easily do this. Open src/main.js and add the code below to it:

// src/main.js

import { setContext } from 'apollo-link-context'

const authLink = setContext((_, { headers }) => {
    // get the authentication token from localstorage if it exists
    const token = localStorage.getItem('blog-app-token')

    // return the headers to the context so httpLink can read them
    return {
        headers: {
            ...headers,
            authorization: token ? `Bearer ${token}` : null
        }
    }
})

// update apollo client as below
const apolloClient = new ApolloClient({
  link: authLink.concat(httpLink),
  cache: new InMemoryCache()
})

First, we import apollo-link-context. Then we make use of it to create an authLink that gets the user token from local storage and return the headers which contains the Authorization header. Lastly, we make use of the authLink in our Apollo client.

Now an Authorization header will be sent along with all requests made to our GraphQL server.

Adding New Post

Posts are the heart of any blog. Users should be able to add new post. Again, we'll first create the GraphQL mutation for add new post to our blog. Add the code below to src/graphql.js:

// src/graphql.js

export const ADD_POST_MUTATION = gql`
    mutation AddPostMutation($title: String!, $content: String!) {
        addPost(
            title: $title,
            content: $content
        ) {
            id
            slug
            title
            content
            user {
                id
                username
                email
            }
        }
    }
`

This mutation takes the title and content of a post we want to add to our GraphQL server.

Next, create a AddPost component within the Admin folder and paste the code below into it:

// src/components/Admin/AddPost.vue

<template>
    <section class="section">
        <div class="container">
            <div class="columns">
                <div class="column is-3">
                    <Menu/>
                </div>
                <div class="column is-9">
                    <h2 class="title">Add Post</h2>

                    <form method="post" @submit.prevent="addPost">
                        <div class="field">
                            <label class="label">Title</label>

                            <p class="control">
                                <input
                                    class="input"
                                    v-model="title"
                                    placeholder="Post title">
                            </p>
                        </div>

                        <div class="field">
                            <label class="label">Content</label>

                            <p class="control">
                                <textarea
                                    class="textarea"
                                    rows="10"
                                    v-model="content"
                                    placeholder="Post content"
                                    ></textarea>
                            </p>
                        </div>

                        <p class="control">
                            <button class="button is-primary">Add Post</button>
                        </p>
                    </form>
                </div>
            </div>
        </div>
    </section>
</template>

<script>
import Menu from '@/components/Admin/Menu'
import { ADD_POST_MUTATION, ALL_POSTS_QUERY } from '@/graphql'

export default {
    name: 'AddPost',
    components: {
        Menu
    },
    data () {
        return {
            title: '',
            content: ''
        }
    },
    methods: {
        addPost () {
            this.$apollo
                .mutate({
                    mutation: ADD_POST_MUTATION,
                    variables: {
                        title: this.title,
                        content: this.content
                    },
                    update: (store, { data: { addPost } }) => {
                        // read data from cache for this query
                        const data = store.readQuery({ query: ALL_POSTS_QUERY })

                        // add new post from the mutation to existing posts
                        data.allPosts.push(addPost)

                        // write data back to the cache
                        store.writeQuery({ query: ALL_POSTS_QUERY, data })
                    }
                })
                .then(response => {
                    // redirect to all posts
                    this.$router.replace('/admin/posts')
                })
        }
    }
}
</script>

This component renders a form for adding new post. It uses the ADD_POST_MUTATION passing to it the necessary variables. Since Apollo client caches (in memory in our case) it queries, we need a way to update the cache whenever we perform mutation actions. Notice there is an update function which we use to update the store by adding the newly added post to cache. First, we fetch the data from cache matching our query (ALL_POSTS_QUERY), then we add the new post to the allPosts array. Lastly, we write the new data back to cache. Once the post is successfully added, we redirect to the list of posts (which we'll create shortly).

Adding Add Post Route

Open src/router/index.js, and add the code below to it:

// src/router/index.js

import AddPost from '@/components/Admin/AddPost'

// add these inside the `routes` array
{
    path: '/admin/posts/new',
    name: 'AddPost',
    component: AddPost
}

Users should be able to add new post now:

Displaying Posts

We'll first create the GraphQL query by adding the code below to src/graphql.js:

// src/graphql.js

export const ALL_POSTS_QUERY = gql`
    query AllPostsQuery {
        allPosts {
            id
            title
            slug
            user {
                username
            }
        }
    }
`

This GraphQL query fetches all posts from our GraphQL server.

Next, create a Posts component within the Admin folder and paste the code below into it:

// src/components/Admin/Posts.vue

<template>
    <section class="section">
        <div class="container">
            <div class="columns">
                <div class="column is-3">
                    <Menu/>
                </div>
                <div class="column is-9">
                    <h2 class="title">Posts</h2>

                    <table class="table is-striped is-narrow is-hoverable is-fullwidth">
                        <thead>
                            <tr>
                                <th>title</th>
                                <th>User</th>
                                <th></th>
                                </tr>
                        </thead>
                        <tbody>
                            <tr
                                v-for="post in allPosts"
                                :key="post.id">
                                    <td>{{ post.title }}</td>
                                    <td>{{ post.user.username }}</td>
                            </tr>
                        </tbody>
                    </table>
                </div>
            </div>
        </div>
    </section>
</template>

<script>
import Menu from '@/components/Admin/Menu'
import { ALL_POSTS_QUERY } from '@/graphql'

export default {
    name: 'Posts',
    components: {
        Menu
    },
    data () {
        return {
            allPosts: []
        }
    },
    apollo: {
        // fetch all posts
        allPosts: {
            query: ALL_POSTS_QUERY
        }
    }
}
</script>

We make use of the Menu component created earlier. Then we define our data which will be populated once the data is gotten from our GraphQL server. Within the apollo object, we add our GraphQL query to fetch all users. This makes use of the ALL_USERS_QUERY we created above. It is important to note that, the name of our data (allUsers in this case) must be the same name used in our GraphQL query (allUsers in this case). Once allUsers is populated with data from our GraphQL server, we display the users in a table by looping through the array of users. We also add a link to view each user details.

Adding Posts Route

Open src/router/index.js, and add the code below to it:

// src/router/index.js

import Posts from '@/components/Admin/Posts'

// add these inside the `routes` array
{
    path: '/admin/posts',
    name: 'Posts',
    component: Posts
}

Now when we visit the /admin/posts route, we should see a list of posts as in the image below:

Creating Blog Homepage

The blog homepage will display a list of all posts created just like in the displaying posts section. In fact, the hompage will use the exact same GraphQL used in displaying posts. It is only the markup of the homepage that will be different. Create a Home component inside src/components and add the code below to it:

// src/components/Home.vue

<template>
    <section class="section">
        <div class="columns">
            <div class="column is-6 is-offset-3">
                <h1 class="title">Latest Posts</h1>

                <h3
                    v-for="post in allPosts"
                    :key="post.id"
                    class="title is-5">
                        <router-link :to="post.slug">
                            {{ post.title }}
                        </router-link>
                </h3>
            </div>
        </div>
    </section>
</template>

<script>
import { ALL_POSTS_QUERY } from '@/graphql'

export default {
    name: 'Home',
    data () {
        return {
            allPosts: []
        }
    },
    apollo: {
        // fetch all posts
        allPosts: {
            query: ALL_POSTS_QUERY
        }
    }
}
</script>

As we can see the JavaScript section is identical to that of Posts component. Just different markup. We loop through the posts array and display the title of each post linked with their slug.

Adding Home Route

Open src/router/index.js, and add the code below to it:

// src/router/index.js

import Home from '@/components/Home'

// add these inside the `routes` array
{
    path: '/',
    name: 'Home',
    component: Home
}

Visiting the / route, we should see our blog homepage as in the image below:

Viewing A Post

The last thing to add is ability to view a specific post. Add the code below to src/graphql.js:

// src/graphql.js

export const POST_QUERY = gql`
    query PostQuery($slug: String!) {
        post(slug: $slug) {
            id
            title
            slug
            content
            user {
                id
                username
                email
            }
        }
    }
`

This query fetch a post by it slug. It takes the slug of the post to be fetched as an argument.

Next, create a SinglePost component inside src/components and add the code below to it:

// src/components/SinglePost.vue

<template>
    <section class="section">
        <div class="columns">
            <div class="column is-6 is-offset-3">
                <router-link class="button is-link is-small" to="/">Back Home</router-link>

                <h1 class="title">
                    {{ post.title }}
                </h1>

                <div class="content">
                    {{ post.content }}
                </div>
            </div>
        </div>
    </section>
</template>

<script>
import { POST_QUERY } from '@/graphql'

export default {
    name: 'SinglePost',
    data () {
        return {
            post: '',
            slug: this.$route.params.slug
        }
    },
    apollo: {
        // fetch post by slug
        post: {
            query: POST_QUERY,
            variables () {
                return {
                    slug: this.slug
                }
            }
        }
    }
}
</script>

We simply display the post title and it content then a link to go back to the homepage. The JavaScript section follows the implementation used in displaying user details. In this case, we get the post slug from the route params.

Adding View Post Route

Open src/router/index.js, and add the code below to it:

// src/router/index.js

import SinglePost from '@/components/SinglePost'

// add these inside the `routes` array
{
    path: '/:slug',
    name: 'SinglePost',
    component: SinglePost,
    props: true
}

*Note: * This route should be the last route in the routes array.

We should be able to view a single post now:

Conclusion

So, in this tutorial, we have seen how to build a blog app with GraphQL, Apollo client and VueJS. We also saw how to connect our frontend app to a GraphQL server. The complete code for this tutorial is available on GitHub.