如何在Rails中管理没有id的表？

gem 'uuid'

class User< ApplicationRecord
  self.primary_key = 'uuid'
end

class CreateUsers< ActiveRecord::Migration[6.1]
  def change
    create_table :users, id: :uuid do |t|
      t.string :name
      t.timestamps
    end
  end
end

class CreateUsers< ActiveRecord::Migration[6.1]
  def change
    create_table :users, primary_key: :email do |t|
      t.string :email
      t.string :name
      t.timestamps
    end
  end
end

class User< ApplicationRecord
  self.primary_key = 'email'
end