orbit-basic/lib/tasks/designs.rake

# encoding: utf-8 

namespace :designs do
  task :change_to, [:design_id] => [:environment] do |t, args|
    design = Design.find(args[:design_id])
    theme_id = design.themes.first.id
  	Page.all.each do |page|
  		page.update_attributes({design_id: args[:design_id], theme_id: (theme_id unless page.root?)})
  	end
  end

end