Geocoding my location and display using gogle-maps-for-rails gem

I want to geocode my location and display using gogle-maps-for-rails gem

View:

= gmaps({ "map_options" => { "auto_adjust" => true } })
= form_tag geocode_geo_locations_path, :method => :get, :remote => true do
  = text_field_tag 'address'
  = submit_tag 'search'

in my controller i:

def geocode
 @location = Gmaps4rails.geocode(params[:address])
 if @location
   @location_hash = @location.map { |loc| {:longitude => loc[:lng], :latitude => loc[:lat], :address => loc[:matched_address]} }.first 
 end
end

and in the geocode.js.erb view

Gmaps4Rails.replace_markers(<%=raw @location_hash.to_json %>);

It works so far that I get a marker on the map, however the map does not get auto_adjusted. How can i do this?