Ruby on Rails

hi
book and page is one_to_many relationship.I want to create them in a
single form.But when clicking create button,the submitted params for
pages are not grouped correctly,
i want
"book"=>{"new_pages"=>[{"name"=>"", "color"=>""},
{"name"=>"","color"=>""}]

but it is
"book"=>{"new_pages"=>[{"name"=>""}, {"name"=>"", "color"=>""},
{"color"=>""}]\

My page and params are listed below.please help me,this take me a whole
day.

new_book page:

<div><%=error_messages_for :book-%></div>
<%form_remote_for :book,@book,:update=>"book{@book.id}",:url=>books_path
do|v|%>
<table>
<tr>
<td><%=v.label "name"-%></td>
<td><%=v.text_field :name-%></td>
</tr>
</table>
<div id="pages">
<%=render :partial=>'page',:collection=>@book.pages-%>
</div>
<%=submit_tag 'create'-%>
<%end-%>

page partial
<%fields_for "book[new_pages][]",page do|o|-%>
<table>
<tr>
<td><%=o.label "name"%></td>
<td><%=o.text_field :name%></td>
<td><%=o.label "color"%></td>
<td><%=o.text_field :color%></td>
</tr>
</table>
<%end-%>

"book"=>{"new_pages"=>[{"name"=>""}, {"name"=>"", "color"=>""},
{"color"=>""}]...
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