nserfontein/graphql-workshop

GraphQL / Event Modeling workshop project

graphql-workshop

GraphQL / Event Modeling workshop project.

Installation

• Install NodeJS 12 or greater: https://nodejs.org
• Install JS modules:

npm install

• Install Docker 2.5 or greater: https://docker.com/products/docker-desktop
• Install Event Store 5.0.8 (specifically) via docker command:

docker run --name eventstore-workshop -it -p 2113:2113 -p 1113:1113 eventstore/eventstore:5.0.8-xenial -e EVENT-STORE_DEV=true -e EVENTSTORE_RUN_PROJECTIONS=All -e EVENTSTORE_START_STANDARD_PROJECTIONS=true

Projections

Add projections to EventStore:

node src/event-store/projections/install.js

Enable Projections in Event Store Admin:

• Go to http://localhost:2113/
• Log in
  • user: admin
  • pass: changeit
• Go to Projections tab; you should see table tennis projections installed.
• Click [Enable All] button.

GraphQL

Launch Apollo:

npm run apollo

• Go to http://localhost:4000 which is the Playground app.

Create a player with a mutation command:

mutation {
  registerPlayer(name: "Your Name Here", country: "CA")
}

In a new Tab, Create a players query:

{
  players {
    name
    country
  }
}

You should see your name in this list. Congratulations, you have succeeded at setting up Event Store and Apollo GraphQL!

Table Tennis Event Model

Running a Table Tennis Tournament

This project contains an app that generates a Tournament complete with players, matches and games. You can run a tournament from the command line:

npm run tournament

While running, the console will display the results of games and matches. Also, the tournament GraphQL projection in the Playground will show the results of matches with the following query:

{
  tournament(key: "Your_tournament_Key") {
    name
    matches {
      player1 {
        name
      }
      player2 {
        name
      }
      winner {
        name
      }
    }
  }
}