lib/generators/paperclip/templates/paperclip_migration.rb.erb
class <%= migration_class_name %> < ActiveRecord::Migration<%= migration_version %>
def self.up
change_table :<%= table_name %> do |t|
<% attachment_names.each do |attachment| -%>
t.attachment :<%= attachment %>
<% end -%>
end
end
def self.down
<% attachment_names.each do |attachment| -%>
remove_attachment :<%= table_name %>, :<%= attachment %>
<% end -%>
end
end