Relation - PRISMA2

[suplere]

Hello,
I have GRAPHQL server based on Prisma2. I have this schema for User and Event :

type Event {
id: ID!
typ: String!
category: String!
description: String
author: User!
location: String
distance: Int
color: String
fullDay: Boolean!
start: DateTime!
end: DateTime!
createdAt: DateTime!
updatedAt: DateTime!
duration: Float!
summary: String!
}
type User {
id: ID!
name: String
email: String!
events: [Event!]!
createdAt: DateTime!
updatedAt: DateTime!
}

How I can design belongsTo relation (based on author field) on Event object? In database I have in field author user id.