Check queried subfields in runtime graphql Nestjs? - graphql

Question

I try to optimize one of my queries which returns #ObjectType() like this:
isFeatureEnabled() {
.
.
.
return {
isDistributedInboundEnabled: await getIsDistributedInboundEnabled(),
isBusinessHoursEnabled: await getIsBusinessHoursEnabled(),
};
}
However, when executing this query with :
query GetCompany {
getCompany{
isFeatureEnabled{
isBusinessHoursEnabled
# isDistributedInboundEnabled <--- Do not query this !
}
}
}
both of the functions are executed (await getIsDistributedInboundEnabled(), await getIsBusinessHoursEnabled()).
Can I check which subfields are queried in runtime? That way only required functions will be executed on BE.

Answer 1

Ok, personally used approach described in this link and found it working with nest 8.x.x:
Fortunately, we can access the details about the GraphQL query with the #Info() decorator. The most straightforward way to use it is with the graphql-parse-resolve-info library.
import { Info, Query, Resolver } from '#nestjs/graphql';
import { Post } from './models/post.model';
import PostsService from './posts.service';
import { parseResolveInfo, ResolveTree, simplifyParsedResolveInfoFragmentWithType } from 'graphql-parse-resolve-info';
import { GraphQLResolveInfo } from 'graphql';
#Resolver(() => Post)
export class PostsResolver {
constructor(
private postsService: PostsService
) {}
#Query(() => [Post])
async posts(
#Info() info: GraphQLResolveInfo
) {
const parsedInfo = parseResolveInfo(info) as ResolveTree;
const simplifiedInfo = simplifyParsedResolveInfoFragmentWithType(
parsedInfo,
info.returnType
);
const posts = 'author' in simplifiedInfo.fields
? await this.postsService.getPostsWithAuthors()
: await this.postsService.getPosts();
return posts.items;
}
}