GraphQL: How do you pass args to to sub objects - graphql

Question

I am using GraphQL to query an object that will be composed from about 15 different REST calls. This is my root query in which I pass in in the ID from the query. This works fine for the main student object that resolves correctly. However, I need to figure out how to pass the ID down to the address resolver. I tried adding args to the address object but I get an error that indicates that the args are not passed down from the Student object. So my question is: How do I pass arguments from the client query to sub objects in a GraphQL server?
let rootQuery = new GraphQLObjectType({
name: 'Query',
description: `The root query`,
fields: () => ({
Student : {
type: Student ,
args: {
id: {
name: 'id',
type: new GraphQLNonNull(GraphQLString)
}
},
resolve: (obj, args, ast) => {
return Resolver(args.id).Student();
}
}
})
});
export default rootQuery;
This is my primary student object that I link the other objects. In this case I have attached the ADDRESS object.
import {
GraphQLInt,
GraphQLObjectType,
GraphQLString,
GraphQLNonNull,
GraphQLList
} from 'graphql';
import Resolver from '../../resolver.js'
import iAddressType from './address.js'
let Student = new GraphQLObjectType({
name: 'STUDENT',
fields: () => ({
SCHOOLCODE: { type: GraphQLString },
LASTNAME: { type: GraphQLString },
ACCOUNTID: { type: GraphQLInt },
ALIENIDNUMBER: { type: GraphQLInt },
MIDDLEINITIAL: { type: GraphQLString },
DATELASTCHANGED: { type: GraphQLString },
ENROLLDATE: { type: GraphQLString },
FIRSTNAME: { type: GraphQLString },
DRIVERSLICENSESTATE: { type: GraphQLString },
ENROLLMENTSOURCE: { type: GraphQLString },
ADDRESSES: {
type: new GraphQLList(Address),
resolve(obj, args, ast){
return Resolver(args.id).Address();
}}
})
});
Here is my address object that is resolved by a second REST call:
let Address = new GraphQLObjectType({
name: 'ADDRESS',
fields: () => ({
ACTIVE: { type: GraphQLString },
ADDRESS1: { type: GraphQLString },
ADDRESS2: { type: GraphQLString },
ADDRESS3: { type: GraphQLString },
CAMPAIGN: { type: GraphQLString },
CITY: { type: GraphQLString },
STATE: { type: GraphQLString },
STATUS: { type: GraphQLString },
TIMECREATED: { type: GraphQLString },
TYPE: { type: GraphQLString },
ZIP: { type: GraphQLString },
})
});
export default Address;
These are my resolver
var Resolver = (id) => {
var options = {
hostname: "myhostname",
port: 4000
};
var GetPromise = (options, id, path) => {
return new Promise((resolve, reject) => {
http.get(options, (response) => {
var completeResponse = '';
response.on('data', (chunk) => {
completeResponse += chunk;
});
response.on('end', () => {
parser.parseString(completeResponse, (err, result) => {
let pathElements = path.split('.');
resolve(result[pathElements[0]][pathElements[1]]);
});
});
}).on('error', (e) => { });
});
};
let Student= () => {
options.path = '/Student/' + id;
return GetPromise(options, id, 'GetStudentResult.StudentINFO');
}
let Address= () => {
options.path = '/Address/' + id + '/All';
return GetPromise(options, id, 'getAddressResult.ADDRESS');
};
return {
Student,
Address
};
}
export default Resolver;

Answer 1

ADDRESSES: {
type: new GraphQLList(Address),
resolve(obj, args, ast){
return Resolver(args.id).Address();
}
}
args passed to ADDRESSES are arguments passed to ADDRESSES field at query time. In the resolve method, obj should be the student object and if you have an id property on it, all you need to do is: return Resolver(obj.id).Address();.