class AddImageLoadedAtToSignatures < ActiveRecord::Migration - AddImageLoadedAtToSignatures has no descriptive comment
def up
unless column_exists?(:signatures, :image_loaded_at)
add_column :signatures, :image_loaded_at, :datetime
end
end
def down
if column_exists?(:signatures, :image_loaded_at)
remove_column :signatures, :image_loaded_at
end
end
end