Download E-books Professional Ruby on Rails (Programmer to Programmer) PDF

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By Noel Rappin

Not anything under a revolution within the approach internet purposes are constructed,Ruby on Rails (RoR) boasts an easy and intuitive nature that avoids programming repetition and makes it infinitely more straightforward to construct for the net. This publication captures the present most sensible practices to teach you the most productive option to construct a excellent internet software with RoR. You?ll examine every thing you must be aware of with the intention to expand Rails so you might make the most of the various interesting and beautiful issues which are being performed by means of the diligent RoR programming neighborhood.

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Log”]. each one do |log_file| FileUtils. copy_file(log_file, “#{log_file}. #{timestamp}”) finish finish desc “Truncates all *. log records in log/ to 0 bytes” activity :clear = > :archive do FileList[“log/*. log”]. each one do |log_file| f = dossier. open(log_file, “w”) f. shut finish finish finish The :archive activity is identical to the log job proven formerly, yet I did are looking to indicate the Ruby FileUtils module, which gives the fundamental dossier manipulation performance that you simply ’ d count on from, say, a Unix command line. The :clear activity is similar to the former model of the log activity, apart from relocating it right into a diversified identify house, and altering the assertion to job :clear = > :archive . This statement defines the 113 c04. indd 113 1/30/08 4:06:18 PM bankruptcy four: construct instruments and Automation :clear job as being depending on :archive to run. with a purpose to outline a job with a number of dependencies, you then claim them as an array, like this: activity :clear = > [:archive, :email_notification] do If it turns into very important, the established initiatives are evaluated so as. the 1st job within the record is evaluated (which may possibly contain that job ’ s dependencies), then the second one job, etc. purely finally the dependencies were evaluated is the particular activity itself carried out. Rake prevents a job from being completed two times, no matter if it ’ s within the dependency tree a number of instances. Now, with those projects outlined, the rake - T command will exhibit them as follows: rake cleanup:archive # Timestamp and replica all log documents rake cleanup:clear # Truncates all *. log records in log/ to 0 bytes operating rake cleanup:clear will invoke the archive habit, after which the transparent habit. one other helpful function of Rake is that it really is terribly versatile approximately the place you claim the dependencies for the duty. activity dependencies will be declared individually from the duty physique. Dependencies may be declared for a similar activity in a number of locations through the rakefile — all of the dependencies are merged right into a grasp checklist whilst the rakefile is interpreted, and all of the dependencies are tracked. So, the transparent job within the prior code might have been written like this: desc “Truncates all *. log documents in log/ to 0 bytes” job :clear do FileList[“log/*. log”]. every one do |log_file| f = dossier. open(log_file, “w”) f. shut finish finish job :clear = > :archive in truth, copying the whole log:clear job into the customized namespace used to be no longer find out how to retain the code maintainable. you could simply upload the dependency to the present job from in the customized dossier — you do have to get round the namespace factor, although. right here ’ s how: namespace :cleanup do desc “Timestamp and duplicate all log records” activity :archive do timestamp = Time. now. strftime(‘%y_%m_%d_%H_%M_%S’) FileList[“log/*. log”]. every one do |log_file| FileUtils. copy_file(log_file, “#{log_file}. #{timestamp}”) finish finish finish job “log:clear” = > “cleanup:archive” 114 c04. indd 114 1/30/08 4:06:18 PM bankruptcy four: construct instruments and Automation the additional dependency needed to be performed outdoors the namespace to permit the 2 varied namespace prefixes to be safely resolved.

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