Get other related records (with id different that queried) - graphql

Question

As a newbie to GraphQL I would appreciate some help in the following:
I have query which retrieves its author and that author's books. I would like the author's books to be author's other books, meaning - except the one being queried. What does it involve?
apollo-angular query:
const getBookQuery = gql`
query($id: ID){
book(id: $id){
id
name
year
author {
id
firstName
lastName
books { # <-- give me all _except_ the one with $id
name
year
id
}
}
}
}
`;
and in the schema.js (node.js server) I have something like:
const RootQuery = new GraphQLObjectType({
name: 'RootQueryType',
fields: {
book: {
type: BookType,
args: { id: { type: GraphQLID } },
resolve(parent, args) {
const { id } = args;
return Book.findById(id);
},
},
books: {
type: GraphQLList(BookType),
resolve() {
return Book.find({});
},
},
// ... other queries ...
}
})
The solution I am looking for should, obviously, not break other queries for books.

Answer 1

You should be able to achieve the exclusion by adding an argument to the Author type def and then appropriately using that argument in the resolver for books (which should be nested resolver on your Author type). Will need to adapt syntax for apollo-angular.
type Author {
id:
firstName: String
lastName: String
books(exclude: ID): [Book]
}
const resolverMap = {
Query: {
book(arent, args, ctx, info) {
...
}
},
Author: {
books(obj, args, ctx, info) {
// Use args.exclude passed to filter results
},
},
};
const getBookQuery = gql`
query($id: ID){
book(id: $id){
id
name
year
author {
id
firstName
lastName
books(exclude: $id) {
name
year
id
}
}
}
}
`;