graphql mongoose returning null - express

Question

I am using graphql with express and mongoose. for some reasons, I am getting null value for embedded documents. tried both async/await and promise.
Schema.JS
const typeDefs = `
type Patient{
name:String
}
type Order {
_id: ID!
orderName: String!
orderDate: Int,
patient:Patient
}
type Query {
allOrders: [Order]
}
`;
module.exports.schema = makeExecutableSchema({
typeDefs,
resolvers
});
resolver.JS
module.exports.resolvers = {
Query: {
async allOrders() {
return await db.cpoeDataModel.CpoeOrder.find();
}
},
Order: {
patient: async (order) => {
console.log("patient Id##", order.patientId);
return await db.domainModel.Patient.findById(order.patientId);
}
}
};
the query:
{
allOrders {
orderName,
patient {
name
}
}
}
result:
{
"allOrders": [
{
"orderName": "order1",
"patient": null
},
{
"orderName": "order2",
"patient": null
}]
}
expected result
{
"allOrders": [
{
"orderName": "order1",
"patient": {
"name":"xyz"
}
},
{
"orderName": "order2",
"patient": {
"name":"xyz"
}
}]
}

Answer 1

the problem was with my order collection not with code. there was some reference of patient Ids that does not exist anymore. that's why getting null values that are acceptable. I was confused just bcoz it's on the top of results.