discourse/db/migrate/20211106085605_create_group_associated_groups.rb

# frozen_string_literal: true
class CreateGroupAssociatedGroups < ActiveRecord::Migration[6.1]
  def change
    create_table :group_associated_groups do |t|
      t.references :group, null: false
      t.references :associated_group, null: false

      t.timestamps
    end

    add_index :group_associated_groups,
              %i[group_id associated_group_id],
              unique: true,
              name: "index_group_associated_groups"
  end
end