Upgrading a rails 2.3.5 app from aspen to cedar

notes.rb

These are my notes while updating a sample app from aspen to cedar.

The app is just a demonstration of using formtastic with haml, and getting it to work on heroku.

heroku plugins:install https://github.com/heroku/heroku-aspen-migrate
	
    Could not initialize heroku-aspen-migrate: no such file to load -- heroku/client/pgbackups

	Are you attempting to install a Rails plugin? If so, use the following:

gem update heroku
heroku plugins:install https://github.com/heroku/heroku-aspen-migrate
heroku maintenance:on -a mccaffrey-formtastic
heroku aspen:migrate -a mccaffrey-formtastic
   Creating Cedar app mccaffrey-formtastic-cedar... done
   Discovering database addon... done, heroku-postgresql:dev
   Verifying pgbackups installation... done
   Adding addons to Cedar app... done
   Creating database backup from mccaffrey-formtastic... . done
   Restoring database backup to mccaffrey-formtastic-cedar... ... done
   Copying config... done
   Cloning original app into temp dir... done
   Converting gems to bundler... 
	/private/var/folders/3B/3BxYeyNUFGCDdNZoz7Colk+++TI/-Tmp-/d20121115-6157-1pki5eu/
        Gemfile:4:in `build': undefined method `ruby' for #<Bundler> (NoMethodError)		
        from /Users/john/.rvm/gems/ree-1.8.7-2010.02@global/gems/bundler-1.0.3/lib/bundler.rb:128

#bundler problem?
bundle --version 
  => 1.0.3
gem update bundler
  => 1.2.2 
#tried again
heroku aspen:migrate -a mccaffrey-formtastic
   Creating Cedar app mccaffrey-formtastic-cedar... failed
   !    Name is already taken
			
#went to heroku.com in browser to delete it and try again	
#failed to start, need to clone and connect to see what's up
  git clone git@heroku.com:mccaffrey-formtastic-cedar -o heroku
	Cloning into mccaffrey-formtastic-cedar...
	!  Invalid path.
	!  Syntax is: git@heroku.com:<app>.git where <app> is your app's name.
	fatal: The remote end hung up unexpectedly

needed to add '.git' to the end
# now I can try: heroku logs
lots of deprecation warnings Gem.source_index...
...
/app/vendor/bundle/ruby/1.8/gems/rails-2.3.5/lib/rails/gem_dependency.rb:119:in `requirement': undefined local variable or method `version_requirements' for #<Rails::GemDependency:0x7ff0374dee80> (NameError)
.....

# rubygems issue?
  https://gist.github.com/807008
  http://www.redmine.org/issues/7516#note-3
	added this to config/environment.rb
	  # after
	  # Bootstrap the Rails environment, frameworks, and default configuration
      require File.join(File.dirname(__FILE__), 'boot')
      ...
	if Gem::VERSION >= "1.3.6" 
	  module Rails
	    class GemDependency
	      def requirement
	        r = super
	        (r == Gem::Requirement.default) ? nil : r
	      end
		  end
    	end
	end

pushed: git push heroku master
check db migration version
heroku run rake db:version
  no such file to load -- rake/rdoctask
http://stackoverflow.com/questions/7826442/no-such-file-to-load-rdoc-task			
	add to Gemfile
	gem "rdoc"
	gem "rdoc-data"
			
http://matthew.mceachen.us/blog/howto-fix-rake-rdoctask-is-deprecated-use-rdoc-task-instead-1169.html

  changed Rakefile
    require 'rake/rdoctask'
     to require 'rdoc/task'
			
git push heroku master && heroku run rake db:version
  ...	
   Missing these required gems:
   haml  
   formtastic 
  ...
				
added to Gemfile
 gem "formtastic", "0.9.1"
 gem "haml", "2.2.6"

bundle update
commit and push
		You are trying to install in deployment mode after changing
	       your Gemfile. Run `bundle install` elsewhere and add the
	       updated Gemfile.lock to version control.
	       ...

oops, bundle install, not bundle update
commit and push
looks all good
heroku open to confirm

with the few cycles of trying to fix gems, and looking up little issues the migration took about an hour. If I had kept the app up to date, it wouldn't have been an issue.

update and run locally, then migrate!