rails3 关于nest resource

rails3里面的nest_resource很强大。
1.route
resoureces :fathers do
  resources :children
end
2.表单
form_for [@father,@child] do
end
3.view helper
father_child_path(@fahter,@child)
father_children_path(@father)
....
4.controller_helper
对应的，后面改成_url
5.在controller中对应的action里面，有param[father_id]参数。