Is it possible to mark a field in an input to a query as requiring a field extended by a different service?
Using the federation-demo to illustrate my question, but keeping a little bit more simple. Having just an Account service and a Reviews service, and adding a karma field to the User, is it possible to filter reviews based on User karma.
Account service, adding a karma int to a User:
extend type Query {
me: User
}
type User @key(fields: "id") {
id: ID!
name: String
username: String
karma: Int!
}
Reviews service, adding a reviews Query:
extend type Query {
reviews(minKarma: Int): [Review!]!
}
type Review @key(fields: "id") {
id: ID!
body: String
author: User @provides(fields: "username")
product: Product
}
extend type User @key(fields: "id") {
id: ID! @external
username: String @external
karma: Int! @external
reviews: [Review]
}
extend type Product @key(fields: "upc") {
upc: String! @external
reviews: [Review]
}
In my resolver for Query.reviews, I want to filter out any review where review.author.karma is less than the specified minKarma.
How do I tell the gateway that when minKarma is specified in the Query input, I want the Account service to be queried first and a representation of users to be passed into the Reviews service, with the karma of each user attached to the review as the author, so that I can do the filter?
Circling back to the question at the top of this post, can I mark the minKarma field as requiring User.karma?
