How do you access a user's identity through a query?

app TodoApp {
  wasp: {
    version: "^0.16.3"
  },
  title: "TodoApp",
  auth: {
    // Tells Wasp which entity to use for storing users.
    userEntity: User,
    methods: {
      // Enable username and password auth.
      usernameAndPassword: {}
    },
    // We'll see how this is used in a bit.
    onAuthFailedRedirectTo: "/login"
  }
}

// Wasp: `version: "^0.16.3"`
route UserPagesRoute { path: "/pages/:username", to: UserPages }
page UserPages {
  component: import { UserPages } from "@src/UserPages"
}

// username is a parameter that comes from the URL
export const getUserPages = async ({ username }: { username: string }, context) => {
  console.log(`1 username: ${username}`)

  //Return all the pages with the author of `username`
  return context.entities.Page.findMany({
    // I don't think I am formatting the `where` correctly
    where: { user: { identities: { username: username } } },
    orderBy: { id: 'asc' },
  })
}

[ Server!] Unknown argument `identities`. Available options are marked with ?.