Apollo client is giving me an error of 'store already contains an id' - what does that mean?
You have to add id also to the creator field:
query getEvent($eventId: ID!) {
Event(id:$eventId) {
id
headline
photo
location
startTime
creator {
id
username
photo
}
}
}
In general, make sure to add id to all subselections of your queries.