Ruby on Rails

I need to reset the values of the input radio in my view , via Ajax

the view has the following generated html
<input checked="checked" class="" id="user_membership_selection_1"
name="user[membership_selection]" type="radio" value="1" />Selected
Membership</p>
<input id="user_membership_selection_2"
name="user[membership_selection]" type="radio" value="2" />
Selected Membership</p>

fin my controller method , I get other values to replace the radio
values "1" => "11" and "2" by "22"
I can get easily the values like that
alert( $
('input:radio[name="user[membership_selection]"]:checked').val() );

but I cannot change it.. I thought I could access them like that
alert( $('input:radio[name="user[membership_selection]"]
[0]').val() );
alert( $('input:radio[name="user[membership_selection]"]
[1]').val() );
and reset the value

$('input:radio[name="user[membership_selection]"][0]').val( "11")
$('input:radio[name="user[membership_selection]"][1]').val( "22")

as $('input:radio[name="user[membership_selection]"]') should returned
an array with the 2 elements ..
but it's wrong ... 'undefined'

any clue ??

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