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    <p>In some projects that don't invoke the entire rails stack, adding rdoc to the Gemfile was the key to success for me:</p> <pre><code>group :development, :test do gem 'rake', '~&gt; 0.9.2.2' gem "rdoc", '~&gt; 3.12' end </code></pre> <p>UPDATE: This was still bugging me with a rails 3.0.x project. Rakefile, gems all seemed ok but I was still getting the issue. To find out exactly where the warning wacoming from I put a canary in gems/rake-0.9.2.2/lib/rake/rdoctask.rb:</p> <pre><code>if Rake.application begin raise 'where am i' rescue puts $@ end Rake.application.deprecate('require \'rake/rdoctask\'', 'require \'rdoc/task\' (in RDoc 2.4.2+)', __FILE__) end </code></pre> <p>This immediately pointed to the issue in the rails stack itself. A quick check and it is apparent that rails 3.0.8 is full of requires to rake/rdoctask. Updating to rails (3.0.9 or higher I believe) fixes the issue (or you can downgrade rake as others have suggested).</p> <p>But while you are stuck on ~ 3.0.8 and don't want to downgrade rake, you can suppress the warning by setting ignore_deprecate in your Rakefile:</p> <pre><code>require File.expand_path('../config/application', __FILE__) require 'rake' require 'rake/testtask' require 'rdoc/task' # add this (and perhaps make it conditional on Rails.version if you like): Rake.application.options.ignore_deprecate = true Babylon::Application.load_tasks </code></pre> <p>Why suppress the warning? My main motivation was to ensure cron jobs that invoke rake don't log and email spurious output.</p>
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    1. POI have still rake/rdoctask deprecated warning
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    1. COThis didn't work in my case..
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    2. COyeah, its come back to bug me too. The rdoc trick takes care of one cause, but there are others...
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    3. COok now I'm happy: got a solution that's working. (updating my answer accordingly)
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