GraphQL nested query returning null field - graphql

Question

I'm trying to learn GraphQL (& node.js & MongoDB etc.). I cant get this simple nested query to return results :
query getLocationByPerson {
People {
firstName
lastName
service {
location
}
}
}
I only get the first level fields, like:
{
"data": {
"People": [
{
"firstName": "xxx",
"lastName": "XXXXX",
"service": null
}
}
Here's my schema:
type Query {
People: [PeopleObject]!
PeopleByName(lastName: String!): [PeopleObject]
PeopleByID(id:ID!): [PeopleObject]
Service: [ServiceObject]
ServiceByID(id:ID!): [ServiceObject]
}
type PeopleObject {
id: ID!
Xid: String!
firstName: String!
lastName: String!
email: String!
serviceId: String
apps: [String]
service: [ServiceObject]
}
type ServiceObject {
id: ID!
name: String!
location: String!
}
And my resolver:
const queries = {
People: () => People.find({}),
PeopleByName: (root,args,context,info) => People.find({lastName: args.lastName}),
PeopleByID: (root,args,context,info) => People.find({_id: args.id}),
Service: () => Service.find({}),
ServiceByID: (root,args,context,info) => Service.find({_id: args.id})
};
Any idea what am I doing wrong?

Answer 1

You need to pass the reference for the location object in service which is same as you mongoose model(i assume you are using mongoose). After passing the reference you can add populate(refernce).exec() in your service query Refer this

Answer 2

Your syntax are dame good for getting any data from graphql
type Query {
People: [PeopleObject]!
}
type PeopleObject {
id: ID!
Xid: String!
firstName: String!
lastName: String!
email: String!
serviceId: String
apps: [String]
service: [ServiceObject]
}
type ServiceObject {
id: ID!
name: String!
location: String!
}
for Simplicity
type Query {
People: [{
id: ID!
Xid: String!
firstName: String!
lastName: String!
email: String!
serviceId: String
apps: [String]
service: [{
id: ID!
name: String!
location: String!
}]
}]!
}
But you have return only people
People: () => People.find({}),
You should return service array object to get that return object with People
People: () => return something Like below result.
[{
id: '5c5ac87e5e4d85ae77de9c50'
Xid: 'xx'
firstName: 'yyy'
lastName: 'zzz'
email: 'xxx#gmail.com'
serviceId: '5c5ac87e5e4d85ae77de9c51'
apps: ['testing', 'google']
service: [{
id: 5c5ac78d5e4d85ae77de9c4f,
name: 'Tester',
location: 'US America',
}, {}]
}, {}]
If you using mongoose use aggregation to get data from mongoBD.