[Rails] How do I properly create a menu with optgroup labels?

[Jim Burgess]

Hi,

I'm trying to produce a select menu with "optgroup" tags.
The HTML output should look like this:

 <optgroup label="Europe">
    <option value="Denmark">Denmark</option>
    <option value="Germany">Germany</option>
    <option value="France">France</option>
  </optgroup>
  <optgroup label="North America">
    <option value="US">United States</option>
    <option value="Canada">Canada</option>
  </optgroup>

In rails I'm typing this:

<%= f.select :member_1,
grouped_options_for_select ([['North America',[['United
States','US'],'Canada']],
['Europe',['Denmark','Germany','France']]]) %>

The result is that rails is adding the generated HTML to the select
menu, that is to say that in the generated menu, instead of seeing:

Europe
 Denmark
 France

etc ..

I see
<optgroup label="Europe"><option value="Denmark">Denmark</option>

etc..

(See attachment)

Here is the HTML produced by Rails:
<select id="applicant_member_1" name="applicant[member_1]">
<option value="&lt;optgroup label=&quot;North America&quot;&gt;
&lt;option value=&quot;US&quot;&gt;United States&lt;/option&gt;">
&lt;optgroup label=&quot;North America&quot;&gt;&lt;
option value=&quot;US&quot;&gt;United States&lt;/option&gt;
</option>
....

Can anyone help me to sort this out?
What am I doing wrong?
How do I properly create a menu with optgroup labels?

Thanks in advance for your help

Attachments:
http://www.ruby-forum.com/attachment/3624/menu.jpg

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