Composite primary key with ActiveRecord

create_group_chat_version.rb

class CreateGroupChatVersion < ActiveRecord::Migration
  def change
    create_table :group_chat_versions, id: false do |t|
      t.integer :version
      t.uuid :group_chat_id

      ...
    end
    add_index :group_chat_versions, [:version, :group_chat_id], name: "group_chat_version_id"
  end
end

Gemfile

...
gem 'composite_primary_keys', '=8.1.5'
...

group_chat_version.rb

class GroupChatVersion < ActiveRecord::Base
  self.primary_keys = :version, :group_chat_id
  belongs_to :group_chat

  ...
end