How to connect multiple m-n relationship records - node.js

Question

I have a schema that looks like this:
model School {
id Int #id #default(autoincrement())
name String
teachers Teacher[]
students Student[]
}
model Teacher {
id Int #id #default(autoincrement())
firstName String
lastName String
schools School[]
students Student[]
}
model Student {
id Int #id #default(autoincrement())
firstName String
lastName String
teacherId Int
teacher Teacher #relation(fields: [teacherId], references: [id])
schoolId Int
school School #relation(fields: [schoolId], references: [id])
}
I want to create in a single call a school, with teacher and student. This is my attempt:
prisma.school.create({
data: {
name: "Best",
teachers: {
create: {
id: 2,
firstName: "Charles",
lastName: "Wise",
students: {
create: {
firstName: "Pauline",
lastName: "Jenkins",
school: {
connect: {
id: -1 // How to reference a school that is being created?
}
}
}
}
}
}
}
});
Unfortunately I have no clue how to pass a school's id when creating a student.
I know that I can do it in two calls by first creating a school with a teacher and then creating a student with that just created school and teacher:
const school = await prisma.school.create({
data: {
name: "Best",
teachers: {
create: {
id: 2,
firstName: "Charles",
lastName: "Wise",
}
}
},
include: {
teachers: true,
}
});
await prisma.student.create({
data: {
firstName: "Pauline",
lastName: "Jenkins",
school: {
connect: {
id: school.id
}
},
teacher: {
connect: {
id: school.teachers[0].id
}
}
}
});
But that looks kind of weird and error prone.
Is there a way to rewrite it to a single call?

Answer 1

You can try this code snippet to either connect to if a record exists or create on the go when it is not there.
prisma.teachers.create({
data: {
id: 2,
firstName: 'Charles',
lastName: 'Wise',
students: {
create: {
firstName: 'Pauline',
lastName: 'Jenkins',
},
},
school: {
connectOrCreate: {
where: {
name: 'best',
},
create: {
name: 'best',
},
},
},
},
});