gistfile1.txt

<form>
  <select type="text" name="filters[body][][scope]"><option name="contains">contains</option></select>
  <input type="text"  name="filters[body][][query]" value="foo">
  <select type="text" name="filters[body][][scope]"><option name="starts_with">starts_with</option></select>
  <input type="text"  name="filters[body][][query]" value="bar">
  <input type="submit" id="submit" value="submit">
</form>

# when send through browser (safari, firefox)
{"body"=>[{"scope"=>"contains", "query"=>"foo"}, {"scope"=>"starts_with", "query"=>"bar"}]}

# when send through webrat form submit in Rails
{"body"=>[{"query"=>"foo"}, {"scope"=>"contains", "query"=>"bar"}, {"scope"=>"starts_with"}]}