Enums

When a scalar field has a small set of possible values, it’s best to use an enum instead. The enum type declaration lists all the options:

enum Direction {
  NORTH
  EAST
  SOUTH
  WEST
}

Enums are usually serialized as strings (for example, "NORTH"). Here’s an example Query type, query operation, and response:

type Query {
  currentHeading(flightId: ID): Direction
}

query {
  currentHeading(flightId: "abc")
}

{
  "data": {
    "currentHeading": "NORTH"
  }
}