Location_id not shown in API respond

Hi Scott, I try to study this GraphQL, and make a request like below:

{
fulfillmentOrders(first: 3){
edges {
node {
assignedLocation{
location{
id
}
}
createdAt
orderName
orderId
destination{
address1
address2
city
countryCode
email
firstName
lastName
phone
province
zip
}
}
}
}
}

I tried to use filter some filed by location ID, but all were failed, which filed should I choose? And also I can’t choose the proudct infomation, how can I get it? @SBD