在rails上的ruby中选择复选框pass array [英] Select checkbox pass array in ruby on rails

问题描述

如何传递array的值？的所选复选框。

How can I pass the value of array? of the selected checkbox.

在视图中：

= check_box_tag 'user_message_ids[]', user_message.id, false

= link_to "<button>Bulk Delete</button>".html_safe, profile_message_path(user_message), :id => 'user_message_ids', :confirm => "Are you sure?", :method => :delete

，我可以将提交按钮放在这个区域的任何一个区域。

and can I place the submit button in any of this area.

像这样：

= form_tag checked_messages_path do
= check_box_tag'user_message_ids []'，user_message.id，false b $ b --------- objects ------------------------------------- --------
--------- objects ---------------------------- -----------------
--------- objects ------------------- --------------------------
--------- objects ---------- -----------------------------------
= submit_tag删除已选中

= form_tag checked_messages_path do = check_box_tag 'user_message_ids[]', user_message.id, false ---------objects--------------------------------------------- ---------objects--------------------------------------------- ---------objects--------------------------------------------- ---------objects--------------------------------------------- = submit_tag "Delete Checked"

推荐答案

使用 form_tag 阻止

<% 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 %>

它会传递一个ids数组到控制器，如{item_ids []=> 1，2，3]}

It will pass an array of ids to controller, like {"item_ids[]" => ["1", "2", "3"]}

因此，您可以对这些ids做任何事。

So you can do anything with these ids

FYI： http://railscasts.com/episodes/165-edit-multiple?view=asciicast

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

我们的update方法还有一个小问题。 如果我们取消选中所有复选框以从所有类别中移除某个产品，则更新将失败，以删除该产品所属的任何类别。这是因为HTML表单上的复选框不会将其值发回如果未选中，因此在产品的参数哈希中不会出现 category_ids ，这意味着 category_ids 未更新。

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.

要解决此问题我们必须修改我们的产品控制器，以设置 category_ids 参数如果未传递到更新操作，则为空数组。我们可以使用 Ruby's || = 运算符，并在更新操作的顶部添加以下内容。

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] || = []

选中复选框，然后正确更新产品，使其不属于任何类别。

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

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