apollo-server/docs/source/migration.md

title	description
Migrating to v0.2	How to migrate from an older version of Apollo Server

Version 0.2.0 of Apollo Server contains several breaking changes in the API. The most notable changes are:

• the apolloServer function no longer exists and was replaced with apolloExpress.
• apolloExpress no longer accepts shorthand type definitions
• apolloExpress doesn't have the resolvers, mocks and connectors options.
• apolloExpress doesn't include GraphiQL any more
• context: if you use connectors in your schema, don't forget to setup default context to at least an empty object, it can't be undefined in this case
• Apollo Server no longer accepts GET requests or parameters in the URL
• apolloExpress no longer parses the HTTP body automatically

In order to make updating from an older version of Apollo Server easier, this guide shows how to use graphql-tools together with apolloExpress and graphiqlExpress to replace the old apolloServer function.

The three main differences between the old and the new approach are:

1. generating the schema is now done with graphql-tools, Apollo Server only uses the finished schema.
2. bodyParser has to be used to parse requests before passing them to expressApollo
3. GraphiQL now has to be served on a separate path

The following code snippet in Apollo Server 0.1.x

import express from 'express';
import { apolloServer } from 'apollo-server';
import Schema from './data/schema';
import Mocks from './data/mocks';
import Resolvers from './data/resolvers';
import Connectors from './data/connectors';

const GRAPHQL_PORT = 8080;

const graphQLServer = express();

graphQLServer.use(
  '/graphql',
  apolloServer({
    graphiql: true,
    schema: Schema,
    resolvers: Resolvers,
    connectors: Connectors,
    mocks: Mocks,
  }),
);

graphQLServer.listen(GRAPHQL_PORT, () =>
  console.log(
    `Apollo Server is now running on http://localhost:${GRAPHQL_PORT}/graphql`,
  ),
);

... should be written as follows in Apollo Server 0.2.x and above:

import express from 'express';

import Schema from './data/schema';
import Mocks from './data/mocks';
import Resolvers from './data/resolvers';
import Connectors from './data/connectors';

// NEW or changed imports:
import { apolloExpress, graphiqlExpress } from 'apollo-server';
import { makeExecutableSchema, addMockFunctionsToSchema } from 'graphql-tools';
import bodyParser from 'body-parser';

const GRAPHQL_PORT = 8080;

const graphQLServer = express();

const executableSchema = makeExecutableSchema({
  typeDefs: Schema,
  resolvers: Resolvers,
  connectors: Connectors,
});

addMockFunctionsToSchema({
  schema: executableSchema,
  mocks: Mocks,
  preserveResolvers: true,
});

// `context` must be an object and can't be undefined when using connectors
graphQLServer.use(
  '/graphql',
  bodyParser.json(),
  apolloExpress({
    schema: executableSchema,
    context: {}, //at least(!) an empty object
  }),
);

graphQLServer.use(
  '/graphiql',
  graphiqlExpress({
    endpointURL: '/graphql',
  }),
);

graphQLServer.listen(GRAPHQL_PORT, () =>
  console.log(
    `Apollo Server is now running on http://localhost:${GRAPHQL_PORT}/graphql`,
  ),
);