ruby on rails - Passing variable param in form via dropdown -

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i have form: 

 <tr>     <% item.inventory_items.each |product| %>       <td>           <%= form_tag("/list_items", method: "post") %>           <%= hidden_field_tag(:item_id, item.id) %>           <%= hidden_field_tag(:inventory_item_id, product.id) %>            <%= hidden_field_tag(:shopping_list_id, shoppinglist.first.id) %>           <%= submit_tag("#{product.price}", class: "btn btn-primary") %>           <% end %>       </td>     <% end %>   </tr>

currently hidden_field shopping_list_id being set, can see, shoppinglist.first.id. placeholder make sure form working. want :user able select of lists submit list_item to. i'm unsure of best way that. ideally i'd able have them hover on product price , have drop down of lists select from, whereby form shopping_list_id from. how can best accomplish this? i'm using twitter bootstrap. in advance.

something should started:

<%= select_tag(@user, :shopping_list_id, options_for_select(@user.lists)) %>

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