如何正確設置收集選擇？

Question

用下面的代碼，如果我點擊搜索它帶我到這些網址

With FireFox > http://example.com/shop?utf8=%E2%9C%93&genre[]=1 
With Safari > http://example.com/shop?utf8=✓&genre%5B%5D=1 

我怎樣才能刪除此「[]」和「％5B％5D」？
只有我想的是 「&流派= 1」

查看代碼

<%= form_tag communities_path, :method => :get, :class => 'form-search' do %> 
    <div class="input-append"> 
    <%= collection_select :genre, nil, Genre.all, :id, :name %> 
    <button type="submit" class="btn">Search</button> 
    </div> 
<% end %> 

Answer 1

<%= select_tag :genre, options_for_select(Genre.all.map{ |g| [g.name, g.id] }) %>