Build GraphQL Server With Express

Step 1 - Connect to Server

// db.js
const Sequelize = require('sequelize')
const _ = require('lodash')
const Faker = require('faker')

const Conn = new Sequelize(
  'test',
  'postgres',
  'postgres',
  {
    dialect: 'postgres',
    host: 'localhost',
  }
)

const Person = Conn.define('person', {
  firstName: {
    type: Sequelize.STRING,
    allowNull: false,
  },
  lastName: {
    type: Sequelize.STRING,
    allowNull: false,
  },
  email: {
    type: Sequelize.STRING,
    allowNull: false,
    validate: {
      isEmail: true,
    }
  }
})

const Post = Conn.define('post', {
  title: {
    type: Sequelize.STRING,
    allowNull: false,
  },
  content: {
    type: Sequelize.STRING,
    allowNull: false,
  },
})

// Relationships
Person.hasMany(Post)
Post.belongsTo(Person)

Conn.sync({
  force: true,
}).then( () => {
  _.times(10, () => {
    return Person.create({
      firstName: Faker.name.firstName(),
      lastName: Faker.name.lastName(),
      email: Faker.internet.email(),
    }).then(person => {
      return person.createPost({
        title: `Sample title by ${person.firstName}`,
        content: 'This is a sample article',
      })
    })
  })
})

module.exports = Conn

Step 2 - Build Schema

// schema.js
const Sequelize = require('sequelize')
const _ = require('lodash')
const Faker = require('faker')

const Conn = new Sequelize(
  'test',
  'postgres',
  'postgres',
  {
    dialect: 'postgres',
    host: 'localhost',
  }
)

const Person = Conn.define('person', {
  firstName: {
    type: Sequelize.STRING,
    allowNull: false,
  },
  lastName: {
    type: Sequelize.STRING,
    allowNull: false,
  },
  email: {
    type: Sequelize.STRING,
    allowNull: false,
    validate: {
      isEmail: true,
    }
  }
})

const Post = Conn.define('post', {
  title: {
    type: Sequelize.STRING,
    allowNull: false,
  },
  content: {
    type: Sequelize.STRING,
    allowNull: false,
  },
})

// Relationships
Person.hasMany(Post)
Post.belongsTo(Person)

Conn.sync({
  force: true,
}).then( () => {
  _.times(10, () => {
    return Person.create({
      firstName: Faker.name.firstName(),
      lastName: Faker.name.lastName(),
      email: Faker.internet.email(),
    }).then(person => {
      return person.createPost({
        title: `Sample title by ${person.firstName}`,
        content: 'This is a sample article',
      })
    })
  })
})

module.exports = Conn

Step 3 - Add GraphQL to Server

// server.js
const Express = require('express')
const GraphHTTP = require('express-graphql')
const Schema = require('./schema')

// Config
const APP_PORT = 3000

const app = Express()
app.use('/graphql', GraphHTTP({
  schema: Schema,
  pretty: true,
  graphiql: true,
}))

app.listen(APP_PORT, () => {
  console.log('Server listening at ' + APP_PORT)
})