Complete example of GraphQL Federation with implementing services written using graphql-dotnet and the ASP.Net middleware package

implementing services: Users Products Baskets

Users and Products services don't know anything about the other services. Baskets only knows about User IDs and Product IDs (it uses them as foreign keys to link those entities to the baskets)

clone this repo docker-compose up

open graphql playground in a browser: http://localhost:8080

run this query:

{
  User: userByUsername(username:"@ada"){
    name
    address {
      postCode
    }
    basket {
      products {
        name
        description
        price
      }
    }    
  }
}

You should get back:

 {
  "data": {
    "User": {
      "name": "Ada Lovelace",
      "address": {
        "postCode": "BL1 6DD"
      },
      "basket": {
        "products": [
          {
            "name": "White Keyboard",
            "description": "A keyboard.  For typing on and that.  It's white",
            "price": 10.99
          },
          {
            "name": "White Mouse",
            "description": "A mouse.  For moving a cursor. And clicking.  It's white",
            "price": 5.99
          }
        ]
      }
    }
  }

marvel at the data coming from each service and being seamlessly joined together.