• fragments lets us break down GQL queries intall smaller queries. like spreading an object in javascript.

fragment addressDetails on User {
  name
  street
  zipcode
  city
}

{
  allUsers {
    ...addressDetails
  }
}

it’s possible to paramtize and add default args to queries:

type Query {
  allUsers(olderThan: Int = -1): [User!]!
}

use aliases when making multiples queires with different args

{
  first: User(id: "1") {
    name
  }
  second: User(id: "2") {
    name
  }
}

Union types work exaclty like TS:

type Adult {
  name: String!
  work: String!
}

type Child {
  name: String!
  school: String!
}

union Person = Adult | Child

Then we can use conditional fragments if the out of the union type returns different things:

{
  allPersons {
    name # works for `Adult` and `Child`
    ... on Child {
      school
    }
    ... on Adult {
      work
    }
  }
}

Graphql security is a can of worms…