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require('dotenv').config();

const mongoose = require('mongoose');

const DATABASE_URL = process.env.DATABASE_URL;

const connectDB = () => {
    return mongoose.connect(DATABASE_URL, {useUnifiedTopology: true, useNewUrlParser: true}, err => {
        if (err){
            console.error('Connection to DB failed');

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\_ Server
    \_ node_modules
    \_ src
        \_ config
        \_ models
        \_ resolvers
        \_ types
        \_ index.js <= this one
    \_ .env
    \_ package.json

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const {ApolloServer} = require('apollo-server');
const connectDB = require('./config/db');
const typeDefs = require('./types');
const resolvers = require('./resolvers');
const models = require('./models');

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const server = new ApolloServer({
    typeDefs,
    resolvers,
    context: {models}
});

// port: process.env.PORT yet undefined but we will have this variable
// once we deployed to heroku
server.listen({port: process.env.PORT || 4000}).then(({url}) => {
    console.log(`Server is ready at ${url}`);

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query FirstQuery {
  coins {
    name
    id
  }
}

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{
	"data": {
		"coins": []
	}
}

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mutation createCoin{
  createCoin(input: {
    name: "Ethereum"
  }){
    id
    name
  }
}

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{
  "data": {
    "coins": [
      {
        "name": "Ethereum",
        "id": "620a7804ded99924b9dda1fc"
      },
      {
        "name": "Flux",
        "id": "620a78c2ded99924b9dda200"

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mutation deleteCoin {
  deleteCoin(id: "620a7804ded99924b9dda1fc"){
    id
  }
}

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{
  "data": {
    "coins": [
      {
        "id": "620a78c2ded99924b9dda200",
        "name": "Flux"
      },
      {
        "id": "620a78c8ded99924b9dda202",
        "name": "Helium"