How resolve a custom nested extendType resolver with prisma nexus? - graphql

Question

I need resolve a custom resolver from a prisma type. But I can't access to children in this case course or subjects, my person type only resolve data over one level.
Deps:
"nexus": "0.11.7",
"nexus-prisma": "0.3.7",
"prisma-client-lib": "1.30.0",
...
Datamodel:
type Person {
id: ID! #unique
firstName: String!
secondName: String
firstSurname: String!
secondSurname: String
sex: SexTypes
address: String
commune: Commune
region: Region
course: Course
phone: String
state: StudentStateTypes #default(value: ACTIVE)
user: User! #relation(name: "UserPerson", onDelete: CASCADE)
birthday: DateTime
registrationNumber: String
listNumber: Int
previousSchool: OtherSchool
scholarship: Scholarship
createdAt: DateTime!
updatedAt: DateTime!
}
type Course {
id: ID! #unique
client: Client
name: String!
person: [Person!]!
teacher: User
subjects: [Subject!]!
evaluations: [Evaluation!]!
createdAt: DateTime!
updatedAt: DateTime!
}
type Subject {
id: ID! #unique
client: Client
name: String!
date: DateTime
isEvaluable: Boolean
order: Int
course: [Course!]!
evaluations: [Evaluation!]!
createdAt: DateTime!
updatedAt: DateTime!
}
type Evaluation {
id: ID! #unique
client: Client
name: String!
date: DateTime!
period: Int!
description: String
coefficientTwo: Boolean
course: Course!
subject: Subject
qualifications: [Qualification!]! #relation(name: "EvaluationQualification", onDelete: CASCADE)
createdAt: DateTime!
updatedAt: DateTime!
}
type Qualification {
id: ID! #unique
client: Client
value: Float!
evaluation: Evaluation! #relation(name: "EvaluationQualification", onDelete: SET_NULL)
person: Person
createdAt: DateTime!
updatedAt: DateTime!
}
My resolver:
export const query = extendType({
type: 'Query',
definition (t: any) {
t.field('qualificationsCustom', {
type: 'Person',
args: {
id: idArg()
},
resolve: async (parent: any, args: any, ctx: any) => {
const person = await ctx.prisma.person({ id: args.id })
const qualifications = person && person.course.subjects.reduce((acc: any, subject: any) => {
acc.push({
subject: subject.name
})
return acc
})
console.log(qualifications)
}
})
}
})
person variable only resolve the next:
{
birthday: '2008-10-27T00:00:00.000Z',
secondName: 'Gisel',
...
And person.course is undefined :/
What I'm doing wrong?

Answer 1

Calling prisma.person({ id: args.id }) will only fetch the requested Person. It does not eager load any associated models. You can query the relations for a particular model instance by utilizing the fluent API as shown in the docs:
prisma.person({ id: args.id }).course()
or even:
prisma.person({ id: args.id }).course().evaluations()
You can also get everything at once by providing a fragment that specifies what fields, including relations, you want to fetch as shown here:
const fragment = `
fragment PersonWithCourse on Person {
# other person fields here
course {
# some course fields here
}
}
`
prisma.person({ id: args.id }).$fragment(fragment)