filter_list.rb

def list_favorite_bars bar_id
  @favorite_bars = get_favorite_bars(params[:bar_id])

  respond_to do |format|
    format.json  { render :json => @favorite_bars}
  end
end

private
  def get_favorite_bars bar_id
    Bar.select([:name, :short_description, :star_rating, :price_rating]).where("latitude IS NOT NULL AND longitude IS NOT NULL").find_all_by_id(bar_id)
  end