class MoveAuthorDataToAuthors < ActiveRecord::Migration

  def up
    Book.all.each do |book|
      first_name, last_name = book.author_name.split(' ')
      Author.find_or_create_by(first_name: first_name, last_name: last_name).books << book
    end
  end

  def down
    raise ActiveRecord::IrreversibleMigration
  end

end

namespace :update_author_tabledb do
  desc "Move Author Data To Authors"
    Book.all.each do |book|
      first_name, last_name = book.author_name.split(' ')
      Author.find_or_create_by(first_name: first_name, last_name: last_name).books << book
    end
  end
end

Book.all.each do |book|
     first_name, last_name = book.author_name.split(' ')
     Author.find_or_create_by(first_name: first_name, last_name: last_name).books << book
 end