rosa-build/db/migrate/20120306212914_add_project_...

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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_attribute(:project_id, comment.commentable.project)
end
end
def down
remove_column :comments, :project_id
end
end