Absinthe Schema Stitching Example

Support Statement

This repository contains three example Absinthe-GraphQL applications. The primary Soccer Team application and the secondary Events application are both independent GraphQL APIs. The Schema Stitch application demonstrates the process of stitching the Events application GraphQL schema into the main Soccer Team application GraphQL schema. Through this automated schema-stitching process, schemas from any downstream GraphQL application can be seamlessly integrated into upstream schemas with little manual interaction.

Code Example

The main Soccer Team schema contains two fields:

  player(number: Int!): Player
  players: [Player]

The Events schema contains six additional fields:

  events: [Event]
  eventByYear(year: Int!): Event
  eventsByName(names: [String!]!): [Event]
  eventsSearch(search: EventSearch!): Event
  eventsFilter(filter: MultiEventSearch!): [Event]
  nextEventLocation: Continent

After Schema Stitching, the final Soccer Team schema will contain all eight fields:

  player(number: Int!): Player
  players: [Player]
  events: [Event]
  eventByYear(year: Int!): Event
  eventsByName(names: [String!]!): [Event]
  eventsSearch(search: EventSearch!): Event
  eventsFilter(filter: MultiEventSearch!): [Event]
  nextEventLocation: Continent

Requirements

elixir: "~> 1.8"
absinthe: "1.5"

Building and Schema Stitching

Clone this repository and install the necessary dependencies by running mix deps.get.
Serve all three applications from the main Schema-Stitching application directory by running iex -S mix. The Events application will be served at http://localhost:3001/graphql and the Soccer Team application at http://localhost:8080/graphql.
During the resolution of a query to the Soccer Team application, fields belonging to the Event schema will be resolved by generating a GraphQL request to the Events app and transforming its response within the Soccer Team app.
Events will then be queryable from the Soccer Team application schema at http://localhost:8080/graphql.

Testing

Run the following mix task from the main project directory:

mix test

License

The Absinthe-GraphQL Schema Stitching Example is licensed under the Apache 2.0 License.