Ruby on Rails

Dear Guys,
I have created the drop down list for state and city. Now when the user selects the state say florida and city say miami, I want to display these names on the new page when the user clicks the search link. Using link_to,  I am not able to pass these names to the new page. Ideally these selected names should go as :paramsbut they arent going through the url .Please me know if its still not clear. Thanks a lot!! Heres the code:

<%= form_for Investopp.new do |f| %>  <div class="field">  <%= f.label :state_id %><br/>  <%= f.collection_select  :state_id, Investopp.year_lookup(@state_ids), :label, :value, include_blank: true %>  </div>    <div class="field">  <%= f.label :city_id, "city" %><br />  <%= f.grouped_collection_select :city_id, Investopp.year_lookup(@state_ids), :cities, :value, :id,:name, include_blank: true %>  </div>  <% end %>  <%= link_to 'Back', investopps_path %>  <%= link_to 'Search', investopps_browsedisplay_path %>

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