Sunspot rails search. Working with range price

I' trying to use a Sunspot search gem and want to realize a price range search. But don't understand how exactly?

So in my item.rb i have

   class Item < ActiveRecord::Base
    #...
    searchable do
        text :title, :boost => 2
        text :description
        double :price
    end

    #...
    end

In items_controller.rb

#...
def index
    @search = Item.search do
      fulltext params[:search]
      with(:price) #.between ???
    end
    @items = @search.results.paginate(page: params[:page])
end

#...

In items/index.html.erb

<form>
  <div class="form-group">
    <%= form_tag index_path, :method => 'get'  do %>
      <%= text_field_tag :search, params[:search], placeholder: 'what are you looking for?', class: "form-control"%>
    <table class="table">
      <tr>
        <td><%= text_field_tag :price #how to setup a min_price?%></td>
        <td><%= text_field_tag :price #how to setup a mazprice?%></td>
      </tr>
    </table>
    <div class="btn button">
      <%= submit_tag "search", :title => nil, class: "btn btn-default" %> 
    </div>
    <% end %>
  </div> 
</form>

What could I do to set a range for price searching (min and max price parameters) in my controller and views? Thanks for help