gistfile1.ru

%p
  = link_to header_link_for(:name)
  \|
  = link_to header_link_for(:location)
  \|
  = link_to header_link_for(:screens)


  def header_link_for(column)
    column_name = column.to_s
    query_string = {}
    
    # Toggle order
    new_order = if params[:sort] == column_name
      params[:order].blank? ? :asc : {:asc => :desc, :desc => :asc}[params[:order].to_sym]
    elsif params[:q].blank? and params[:sort].blank? and column_name == 'name'
      :desc
    else
      :asc
    end
    
    # Toggle order indicator
    indicator = case params[:order]
    when 'desc' then '↓'
    else '↑'
    end
    
    # Build query string
    unless params[:q].blank?
     query_string = query_string.merge({:q => params[:q]})
    end
    unless params[:q].blank? and column_name == 'name' and params[:order] == 'desc'
      query_string = query_string.merge({:sort => column_name, :order => new_order.to_s})
    end
    query_string = query_string.collect {|k,v| "#{k}=#{v}"}.join('&')
    
    # Generate complete path
    unless query_string.blank?
      path = [request.path, query_string].join('?')
    else
      path = request.path
    end
        
    # Add order indicator to active header link
    if params[:sort] == column_name or (params[:q].blank? and params[:sort].blank? and column_name == 'name')
      column_name = indicator + " " + column_name
    end
    
    # Build link
    link_to column_name, path
  end