GraphQL Federation - Code First

A tweaked example of GraphQL Federation using Code First approach. (original example)

Execution

First, build types and entities:

npm -w types run build

Make sure to start the two sub-graph applications first, then the gateway. Otherwise the gateway won't be able to fetch schemas from the sub-graphs.

npm -w users-application run start

npm -w posts-application run start

npm -w somethings-application run start

npm -w gateway run start

Access the graph

You can reach the gateway under http://localhost:3002/graphql

Query a combined graph

query getUserWithPosts($userId: ID!) {
  getUser(id: $userId) {
    id
    name
    posts {
      authorId
      id
      title
    }
  }
}