class CreateAnnonceAccountNewsgroups < ActiveRecord::Migration def change create_table :annonce_account_newsgroups do |t| t.references :annonce_account, index: true t.references :newsgroup, index: true t.timestamps null: false end add_foreign_key :annonce_account_newsgroups, :annonce_accounts add_foreign_key :annonce_account_newsgroups, :newsgroups newsgroups = Newsgroup.where(:default_checked => true).all AnnonceAccount.all.each do |annonce_account| annonce_account.newsgroups << newsgroups end end end