What’s wrong with my local Rails environment? - ruby-on-rails

Question

There is a Rails application I started a full year ago. It’s a Rails 2.3 app.
Now, someone else has made remote changes (it’s on Github, sorry, but it’s private). And I have done
sudo gem update
that is, updated all my gems, including Rails (to 3).
Realizing this, I have done
rake:freeze:edge RELEASE=2.3.8
or whatever to make this release use that version of rails, hoping this was the solution.
however, no such luck so far.
I get errors trying to start the server, AND trying to run script/console (though it’s more successful).
Note that this exact application works just fine on EngineYard.
Server:
$ script/server
=> Booting Mongrel
=> Rails 2.3.8 application starting on http://0.0.0.0:3000
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/yaml.rb:133:in `load': syntax error on line 45, col 3: `' (ArgumentError)
from /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/yaml.rb:133:in `load'
from /Users/ajh/Sites/PROJECT_NAME/config/../vendor/rails/railties/lib/initializer.rb:902:in `database_configuration'
from /Users/ajh/Sites/PROJECT_NAME/config/../vendor/rails/railties/lib/initializer.rb:437:in `initialize_database'
from /Users/ajh/Sites/PROJECT_NAME/config/../vendor/rails/railties/lib/initializer.rb:141:in `process'
from /Users/ajh/Sites/PROJECT_NAME/config/../vendor/rails/railties/lib/initializer.rb:113:in `send'
from /Users/ajh/Sites/PROJECT_NAME/config/../vendor/rails/railties/lib/initializer.rb:113:in `run'
from /Users/ajh/Sites/PROJECT_NAME/config/environment.rb:11
from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `require'
from /Users/ajh/Sites/PROJECT_NAME/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in `require'
from /Users/ajh/Sites/PROJECT_NAME/vendor/rails/activesupport/lib/active_support/dependencies.rb:521:in `new_constants_in'
from /Users/ajh/Sites/PROJECT_NAME/vendor/rails/activesupport/lib/active_support/dependencies.rb:156:in `require'
from /Users/ajh/Sites/PROJECT_NAME/vendor/rails/railties/lib/commands/server.rb:84
from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
from /Library/Ruby/Site/1.8/rubygems/custom_require.rb:31:in `require'
from script/server:3
Console:
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/yaml.rb:133:in load':ArgumentError: syntax error on line 45, col 3:rai'
And when, in console, I try to use a defined model:
#mm = MyModel.find(:all)
NameError: uninitialized constant MyModel
from /Users/ajh/Sites/PROJECT_NAME/vendor/rails/activesupport/lib/active_support/dependencies.rb:443:in load_missing_constant'
from /Users/ajh/Sites/PROJECT_NAME/vendor/rails/activesupport/lib/active_support/dependencies.rb:80:inconst_missing'
from /Users/ajh/Sites/PROJECT_NAME/vendor/rails/activesupport/lib/active_support/dependencies.rb:92:in `const_missing'
from (irb):1

Answer 1

I just had this error, and the problem turned out to be that I'd used a tab instead of a double-space in the database.yml file. Thought I'd mention it, in case others have the same trouble.

Answer 2

My database.yml had a stray end keyword. Cleaning up that file solved my problems. Thanks to Garrett for pointing me in the right direction!