ruby-on-rails – 在rails上的ruby中选择复选框传递数组

<% form_tag delete_mutiple_items_path do %>
  <table>
    <thead>
      <tr>
        <th></th>
      </tr>
    </thead>
    <tbody>
      <% @items.each do |item| %>
      <tr>
        <td><%= check_box_tag "items[]",item.id %></td>
      </tr>
      <% end %>
    </tbody>
  </table>
  <%= submit_tag "delete Checked" %>
<% end %>

它会将一组id传递给控制器??,例如{“item_ids []”=> [“1”,“2”,“3”]}

所以你可以用这些ID做任何事情

仅供参考：http://railscasts.com/episodes/165-edit-multiple?view=asciicast

更新(One Small Gotcha)

从这里：http://railscasts.com/episodes/17-habtm-checkboxes?view=asciicast

There is still one small problem with our update method. If we uncheck all of the checkboxes to remove a product from all categories then the update fails to remove any categories the product was in. This is because a checkbox on an HTML form will not have its value sent back if it is unchecked and therefore no category_ids will appear in the product’s parameters hash,meaning that the category_ids are not updated.

To fix this we have to modify our products controller to set the category_ids parameter to be an empty array if it is not passed to the update action. We can do this using Ruby's ||= operator and add the following like at the top of the update action.

params[:product][:category_ids] ||= []

This will ensure that if none of the checkboxes are checked then the product is updated correctly so that it is in no categories.