type Post @model @auth(rules: [{allow: private}, {allow: owner}]) {
  id: ID!
  userId: ID!
  postBody: String!
  pictureKey: String!
  createdAt: AWSDateTime!
  postedBy: User! @belongsTo(fields: ["userId"])
}

type User @model @auth(rules: [{allow: private}, {allow: owner}]) {
  id: ID!
  username: String!
  profilePic: String!
  posts: [Post] @hasMany(fields: ["id"])
}