To auto-invoke on rake:db:migrate in Rails 3 using as gem

[DougPuchalski]

Add to the end of your Rakefile.

Dir["#{Gem.searcher.find('annotate').full_gem_path}/**/tasks/**/*.rake"].each {|ext| load ext}

[ctran]

Added this to the wiki.

[igorbernstein]

To avoid deprecation warnings use:

Dir["#{Gem::Specification.find_by_name("annotate").full_gem_path}/**/tasks/**/*.rake"].each {|ext| load ext}

[eLafo]

I think this should be done only in development mode. So maybe it is better to use:

Dir["#{Gem::Specification.find_by_name("annotate").full_gem_path}/**/tasks/**/*.rake"].each {|ext| load ext} if Rails.env.development?