Uninitialized Constant Rake::DSL and Heroku

I took @jqr's advice and signed up for Heroku this morning. Agile Web Development had me working on running a virtual name server with Apache and it was way too complicated for my tastes. Apparently coders who don't want to deal with server-side headaches are pretty common, hence Heroku!

But I've hit a snag. I get an uninitialized constant Rake::DSL error whenever I try to run a migration on Heroku. Here's the full error:

gozer /users/tylermoore/code/depot master$ heroku rake db:migrate
(in /app)
rake aborted!
uninitialized constant Rake::DSL
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:2482:in `const_missing'
/app/Rakefile:6:in `'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:2373:in `load'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:2373:in `raw_load_rakefile'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:2007:in `block in load_rakefile'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:2058:in `standard_exception_handling'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:2006:in `load_rakefile'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:1991:in `run'
/usr/ruby1.9.2/bin/rake:31:in `

'

Apparently, this is a well-documented error, and I've dug through a ton of Stack Overflow and Google discussion threads, trying various solutions but no luck so far.

I've manually set my rake gem to version 0.8.7, updated my GemFile and pushed changes to Git, which works for a lot of people, but not for me. Still, I'm not discouraged. I'll figure this out eventually. Just thought I'd throw this up here in case someone has had this exact error and found another solution.

Setting up a virtual Apache server

Holy shit, 10 days without a blog post? Fear not, I have been coding! Just not writing about coding.

So here's where I'm at now. I'm near the end of the practical section of Agile Web Development. The chapter I'm on now is about deployment and I'm having trouble setting up a virtual Apache server and actually getting Depot to deploy. Everything appears to be installed correctly, but I can't get everything tied together correctly.

How do I find my host name? I'll need to define it as depot.hostname.com in my Apache configuration file. I thought it would just be depot.localhost.com, or perhaps depot.127.0.0.1.com, but neither of those worked.

I also had trouble editing my hosts file. I'm able to open it through the terminal, but it won't allow me to make changes.

Still, this headache is a minor set back. I know it's something I need to learn, but for now I think learning more actual coding will be more useful to me. Any good recommendations for new books? I really liked Agile Web Development, so I might look into something else by the Pragmatic Programmers. Not sure if Advanced Rails Recipes would be beyond me or not.