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class LogsController < ApplicationController def upload flash[:notice] = "Uploaded new file... \n" count=0 if params[:upload_with_active_record_extensions] # If the user chose the Active Record extensions # button, we'll use that and measure the time # it took. real_time_elapsed = Benchmark.realtime do columns = [:user_agent, :path_info, :remote_addr, :http_referrer, :status, :visited_at] values = [] LogParser.new.parse_io_stream(params[:log][:file]) do |l| values << [ l['HTTP_USER_AGENT'], l['PATH_INFO'], l['REMOTE_ADDR'], l['HTTP_REFERER'], l['STATUS'], Date.parse(l['DATETIME']) ] count = count + 1 end Hit.import columns, values, :validate=>false if values.length>0 end else # If the user chose the "Upload with Active Record" button, # then use regular Active Record to upload the records and # measure the time it takes. real_time_elapsed = Benchmark.realtime do LogParser.new.parse_io_stream(params[:log][:file]) do |l| Hit.create( :user_agent => l['HTTP_USER_AGENT'], :path_info => l['PATH_INFO'], :remote_addr => l['REMOTE_ADDR'], :http_referrer => l['HTTP_REFERER'], :status => l['STATUS'], :visited_at => l['DATETIME'] )

var presidents = ["Washington", "Adams", "Jefferson", "Madison", "Monroe", "Adams"]; presidents.without("Adams", "Monroe"); //-> ["Washington", "Jefferson", "Madison"];

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It should come as no surprise that modifying our fragment cache is just a simple matter of changing the expire_page commands in our comic sweeper to expire_fragment commands instead: private def expire_cache_for(record) prev_version = (record.id - 1) expire_fragment(:controller => 'public', :action => 'index') expire_fragment(:controller => 'public', :action => 'webcomic', :id => record.id) expire_fragment(:controller => 'public', :action => 'webcomic', :id => prev_version) end After those changes, if we make a modification to one of the comics (such as changing its name), we can see our fragments being expired: Processing ComicsController#update (for 127.0.0.1 at 2007-05-28 22:24:23) [PUT] Session ID: 6d22fd6a722d8a707d6803ed16df0539 Parameters: {"commit"=>"Update", "_method"=>"put", "action"=>"update", "id"=>"2", "controller"=>"comics", "comic"=>{"title"=>"Chunky Bacon", "description"=>"Chunky Bacon"}} Comic Load (0.000303) SELECT * FROM comics WHERE (comics."id" = 2) Comic Update (0.000455) UPDATE comics SET "content_type" = 'image/jpeg', "size" = 325742, "height" = 650, "title" = 'Chunky Bacon, "filename" = 'comic.jpg', "width" = 647, "description" = 'Chunky Bacon' WHERE "id" = 2 Expired fragment: localhost:3000/ (0.00148) Expired fragment: localhost:3000/comic/2 (0.00023) Expired fragment: localhost:3000/comic/1 (0.00016) Redirected to http://localhost:3000/admin/comics/2 Completed in 0.14893 (6 reqs/sec) | DB: 0.00076 (0%) | 302 Found [http://localhost/admin/comics/2] With that, we ve effectively implemented fragment caching and simplified our application by reducing duplication. Go ahead and delete the sessions controller and its related routes, templates, and so forth now, since they ll no longer be of any use to us.

Summary

count = count + 1 end end end flash[:notice] << " #{count} uploaded, #{Hit.count} total\n" flash[:notice] << " #{'%0.2f' % real_time_elapsed} elapsed, " << real_time_elapsed)*60 } records per minute ." "#{'%0.2f' % (count.to_f /

Now that I look back on it, I realize that this chapter hasn t been too embarrassing for either of us. I managed to fill in a few of the cracks I had skipped over in previous chapters, and you got a broader look at the some of the APIs Prototype provides. Part 2 of this book will focus on script.aculo.us and its robust effects library and set of UI controls. We ll revisit everything covered in this chapter as we explore script.aculo.us through hands-on examples.

redirect_to :controller=>:home, :action=>:index end def clear_all Hit.delete_all flash[:notice] = 'Logs cleared!' redirect_to :controller=>:home, :action=>:index end end

Summary

HTML is the term assigned to a collective set of technologies used to create dynamic web content, including HTML, JavaScript, and CSS. The dynamism in DHTML comes from the fact that we re modifying the structure and presentation layers of the document (HTML and CSS) after the page has been loaded. This definition is broad enough to cover animations (elements moving across the page over time), new interaction models (dragand-drop), and new controls (sliders, combo boxes, and in-place editors). DHTML isn t a special language; it s just a term for what becomes possible when the DOM APIs for markup and style are made available to JavaScript. Some of it relies on stable, agreed-upon standards like the DOM; some of it relies on the mystical APIs that were introduced a decade ago as part of the browser wars. It exists at the intersection of the visual and the analytical, making designers and developers equally uncomfortable. We ll deal with the analytical parts as we go. The visual parts require a crash course in CSS concepts and a quick look at the APIs that let us control how elements are displayed through JavaScript.

Save this as app/controllers/logs_controller.rb. Now, define a controller that creates your reports, as shown in Listing 10-3.

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