# -*- encoding : utf-8 -*- class AddProjectToComment < ActiveRecord::Migration def up add_column :comments, :project_id, :integer Subscribe.reset_column_information Comment.where(:commentable_type => 'Grit::Commit').destroy_all Comment.where(:commentable_type => 'Issue').each do |comment| comment.update_column(:project_id, comment.commentable.project.id) end end def down remove_column :comments, :project_id end end