Gruff和缓存图表

     之前已经介绍了一些关于Gruff的基础知识和应用，当然gruff的图表是生成的，当时生产，就存在缓存的问题。那么，我们看一个Gruff缓存的例子：

1. 安装插件

sudo gem install gruff 

2. Rails中进行配置

Rails::Initializer.run do |config|    
  config.gem 'gruff', :lib => 'gruff', :version => '0.3.4   
end  

3. 在Controller的调用

class GruffController < PortalController   
  append_before_filter :load_graph,   
   :only => [total_orders_graph, :top_sellers_graph]   
  caches_action :recent_orders_graph, :expires_in => 1.day.to_i   
  
  def total_orders_graph   
    orders_graph =  @graph.generate_total_orders   
    send_data orders_graph.to_blob , :type => 'image/png'  
  end  
  
private   
  def load_graph   
    @graph = Graphs::ClientGraph.new(@CURRENT_CLIENT)   
  end  
end  

4. 在model中进行cache

class Graphs::ClientGraph   
  def initialize(client)   
    @client = client   
  end  
  
  def generate_total_orders   
    total_orders_graph = Gruff::Bar.new  
    total_orders_graph.title = "Orders"  
    dates = working_week   
    total_orders_graph.labels = Hash[*dates.collect{|date|[dates.index(date), date.strftime("%d %b")]}.flatten]   
  
    datasets = []   
    for date in dates   
      datasets.push(@client.orders.on_day   
        (date.beginning_of_day,date.end_of_day).count)   
    end  
  
    total_orders_graph.data(:total_orders,datasets, '#009900')   
    total_orders_graph.x_axis_label = 'Date'  
    total_orders_graph.y_axis_label = "Total"  
    total_orders_graph.hide_legend = true  
    total_orders_graph   
  end  
  
private   
  def working_week   
    days_in_a_week = 7   
    dates = []   
    days_in_a_week.times do |day_value|   
      date = Date.today - day_value.days   
      dates.push date if date.wday != 0 && date.wday != 6   
    end  
    dates.reverse   
  end  
end 

5. Html的显示

<%= image_tag( url_for(:action => :total_orders_graph, :controller => :client_dashboard), :size => '500x400') -%> 

6. 生成效果如下

评论

1 楼 a398302010 2010-09-13  

您好！
   我今天晚上学着你这样配置，配置了好久还是不能成功。
   你能给我说下controllers下的控制器的命名应该是怎样。models下模型的命名应该是怎样。views下.rhtml的命名应该是怎样吗。
   谢谢了