How to setup nested entity resolver in async-graphql

[cchee]

First of all, this is a great library. The example codes are very helpful. I was able to quickly setup database schema along with graphql using this amazing library. But I am still a bit confused on how to setup nested entity query using async-graphql even after looking at the example code.

I am trying the get the customer query to be able to lookup a list of orders. I saw the example and tried to follow along to make it works with my database schema using sea-orm.

Here is the customer.rs under entity.
#[derive(Clone, Debug, Default, PartialEq, DeriveEntityModel, Serialize, Deserialize, SimpleObject)]
#[sea_orm(table_name = "customers", schema_name = "public")]
#[graphql(concrete(name = "Customer", params()))]
pub struct Model {
#[sea_orm(primary_key)]
#[graphql(shareable)]
pub id: i32,
#[sea_orm(indexed)]
pub name: String,
}
// all the rest
:
:

Here is the order.rs under entity.
#[derive(Clone, Debug, Default, PartialEq, DeriveEntityModel, Serialize, Deserialize, SimpleObject)]
#[sea_orm(table_name = "orders", schema_name = "public")]
#[graphql(concrete(name = "Order", params()))]
pub struct Model {
#[sea_orm(primary_key)]
#[graphql(shareable)]
pub id: i32,
#[sea_orm(indexed)]
pub customer_id: i32,
#[sea_orm(indexed)]
pub amount: f32,
}
// all the rest
:
:

How do I change the code that makes use of async-graphql to support nested entity (order) in the following query?
query {
getCustomers {
{
id
name
orders {
id
amount
}
}
}
}

Apologize if this sounds like a dumb question, I am new to rust as well as async-graphql.

p.s. I managed to get federation working locally using rover dev, but I just couldn't figure out how to get the resolver for nested entity.

[cchee]

https://github.com/async-graphql/examples/blob/59cfedf21c1bee4c06a6345222a0d67ff34b20f1/federation/static-schema/federation-reviews/src/main.rs

Ok. Just stumble upon this one... Going to improvise and see if that helps...

[cchee]

I thought I could borrow and improvise the implementation for User-Reviews from the example. I added

#[ComplexObject]
impl Customer {
async fn orders<'a>(&self, ctx: &'a Context<'_>) -> Vec<&'a Order> {
let orders = ctx.data_unchecked::<Vec<Order>>();
orders
.iter()
.filter(|review| orders.customer_id == self.id)
.collect()
}
}

and added the following above pub struct Customer
#[graphql(complex)]

That didn't seem to help...

[cchee]

Can anyone please enlighten me? Or give me some pointers? Even comment to stay whether I am on the right track of getting close to make this work?

[cchee]

@sunli829, do you have some spare time to kindly shred some light to enlighten an apparently lost soul?

[cchee]

@sunli829 老油條, 可以請您幫個忙？請您多多指教

[sunli829]

See if this helps you?

https://romankudryashov.com/blog/2020/12/graphql-rust/#_apollo_federation_support

[cchee]

Thank you @sunli829. Let me give that a try.

[cchee]

I am so excited. Nested query is working now!!! Thank you so much @sunli829!!!

[cchee]

@sunli829 By the way, it is working when I use multiple Apollo rover dev for subgraph services, but it couldn't resolve when using Apollo router with router.yaml. Is there something I missed in the router.yaml?

[cchee]

Figured it out... I need to re-publish the updated graphql schema file for all the subgraphs and the supergraph. After that, everything works.