Rake aborted - uninitialized constant Rake::DSL [duplicate] - ruby-on-rails

Question

I'm having a really frustrating issue: Rake is being dumb.
Here's how the problem comes about:
$ rails new test_app
$ rails generate scaffold new_scaffold field1:string field2:text
Both of those work just fine, but then when I do this,
$ rake db:migrate
I get the following error.
(in /home/mikhail/test_app)
rake aborted!
uninitialized constant Rake::DSL
/usr/lib/ruby/1.9.1/rake.rb:2482:in `const_missing'
/usr/lib/ruby/gems/1.9.1/gems/rake-0.9.0/lib/rake/tasklib.rb:8:in `<class:TaskLib>'
/usr/lib/ruby/gems/1.9.1/gems/rake-0.9.0/lib/rake/tasklib.rb:6:in `<module:Rake>'
/usr/lib/ruby/gems/1.9.1/gems/rake-0.9.0/lib/rake/tasklib.rb:3:in `<top (required)>'
/usr/lib/ruby/gems/1.9.1/gems/rake-0.9.0/lib/rake/rdoctask.rb:20:in `require'
/usr/lib/ruby/gems/1.9.1/gems/rake-0.9.0/lib/rake/rdoctask.rb:20:in `<top (required)>'
/usr/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/tasks/documentation.rake:1:in `require'
/usr/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/tasks/documentation.rake:1:in `<top (required)>'
/usr/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/tasks.rb:15:in `load'
/usr/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/tasks.rb:15:in `block in <top (required)>'
/usr/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/tasks.rb:6:in `each'
/usr/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/tasks.rb:6:in `<top (required)>'
/usr/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/application.rb:214:in `require'
/usr/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/application.rb:214:in `initialize_tasks'
/usr/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/application.rb:139:in `load_tasks'
/usr/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/application.rb:77:in `method_missing'
/home/mikhail/test_app/Rakefile:7:in `<top (required)>'
/usr/lib/ruby/1.9.1/rake.rb:2373:in `load'
/usr/lib/ruby/1.9.1/rake.rb:2373:in `raw_load_rakefile'
/usr/lib/ruby/1.9.1/rake.rb:2007:in `block in load_rakefile'
/usr/lib/ruby/1.9.1/rake.rb:2058:in `standard_exception_handling'
/usr/lib/ruby/1.9.1/rake.rb:2006:in `load_rakefile'
/usr/lib/ruby/1.9.1/rake.rb:1991:in `run'
/usr/bin/rake:31:in `<main>'
I've looked about the Internet for similar/same errors, and people have had them. Just no one ever seems to solve the problem!
How do I fix this problem?

Answer 1

A tweet from DHH earlier. Rake .9.0 breaks Rails and several other things, you need to:
gem "rake", "0.8.7"
in your Gemfile.

Answer 2

I made some research just after my previous answer (sorry, I must do before it).
All problems are solved with Rake gem 0.9.2.. I followed these steps:
I installed gem install rake -v=0.9.2 (I had the 0.9.1 gem)
removed the 0.9.1 with gem uninstall rake -v=0.9.1
updated with bundle update
then the db:migrate showed a warning, WARNING: Global access to Rake DSL methods is deprecated. Please....
It was solved by adding the following to the Rake file.
module ::YourApplicationName
class Application
include Rake::DSL
end
end
I ommited the module ::RakeFileUtils extend Rake::FileUtilsExtend option sugested by #databyte.
It means that the Rake gem 0.9.2 works fine!

Answer 3

Going through Chapter 2 of Railstutorial (demo_app) and ran into this problem. I tried all of the other answers listed here, but couldn't get it to work until I did this:
Put this in your Rakefile above require 'rake':
require 'rake/dsl_definition'
via How to fix the uninitialized constant Rake::DSL problem on Heroku?
I also recommitted and pushed all files to Github and Heroku.

Answer 4

All I needed to do was use:
gem install rake
I had version 0.9.2 already, just needed installing.

Answer 5

Reinstall the rake gem and it should work fine:
gem uninstall rake -v=0.9.2
gem install rake -v=0.9.2
If not, specify version '0.8.7' in your Gemfile.

Answer 6

If not using Bundler:
sudo gem install rake -v 0.8.7
sudo gem uninstall rake
Then choose to uninstall 0.9.0.

Answer 7

If like me you're stuck on rake 0.8.7, and you're using Rails 3.2.x then railties adds a requirement for Rake::DSL
To solve this, to the top of your Rakefile you should add:
module Rake
module DSL
end
end

Answer 8

I solved the same problem with the following steps:
In Gemfile:
gem 'rake', '0.9.2'
Then ran this on the console:
sudo bundle update rake
Then added the following lines to Rakefile:
require 'rake/dsl_definition'
include Rake::DSL

Answer 9

Rails 3.1.rc1 has been updated. For your own Rakefiles, you can add this before the call to load_tasks.
module ::YourApplicationName
class Application
include Rake::DSL
end
end
module ::RakeFileUtils
extend Rake::FileUtilsExt
end
https://gist.github.com/4cd2bbe68f98f2f0249f
UPDATE: Also noticed it's already answered here as well: Undefined method 'task' using Rake 0.9.0

Answer 10

I had the same issue and had to use the rake 0.8.7 gem instead of 0.9.0.

Answer 11

I am a Windows XP user and I had the same problem.
I entered gem "rake", "0.8.7" into the gemfile, and then typed the following from the command window.
bundle update rake
This fixed my problem.

Answer 12

Go to your project path
Type bundle install --path=vendor/bundle
Type bundle exec rake db:migrate
To start server type bundle exec rails s. Use bundle exec and you will be sure that you use right gems (required version) for your project.
Also I would recommend you to add vendor/bundle to .gitignore if you use git and make alias for bundle exec. If you use zsh you can follow this approach

Answer 13

Same as Branstar above - thanks Branstar!
OS: Windows Vista
Level: Completely new to Ruby on Rails
I already had Ruby 1.9.2 installed
I followed the instructions in Running Rails 3 on Windows.
All worked up until the "rake db:migrate" part which gave me the same output as original post.
I ran:
gem install rake
I ran again:
rake db:migrate
Then I was able to start the Ruby on Rails server and had everything in place.
Thanks again Branstar :-)

Answer 14

I feel for you (mikhailvs), it's really frustrating. I have been going crazy for almost one full day. I even uninstalled Ruby and all its dependent files and shutdown my PC, but I still got the same problem.
What I got from the error message is the problem with Rake 0.9.2. It seems like it wasn’t fully installed. So I had to reinstall gem install rake -v=0.9.2
I wasn’t sure if I have rake –v0.9.1 installed. So to make sure I’m safe I tried to remove that old version with gem uninstall rake -v=0.9.1. But is showed me the error message
ERROR: While executing gem ... (Gem::InstallError)
cannot uninstall, check `gem list -d rake`
OK, so I checked all Rake directories on my PC, and found I only had Rake 0.9.2.
Then to check if everything went alright, I migrated with rake db:migrate. And it worked :)
I think I didn’t have Rake 0.9.1 because I clean-installed Ruby (rubyinstaller-1.9.2-p180 - on my Windows 7 system) and all gems as well. In the meantime Rake 0.9.2 wasn’t fully installed.

Answer 15

Uninstalling with "gem uninstall rake" worked for me, I had 2 versions installed, so I jest did a clean reinstall.
"rake db:create", to make sure the database exists
and then "rake db:migrate" to seal the deal.

Answer 16

I had the same issue using Rake 0.9.2.2. I solved this problem by using bundle exec.

Answer 17

For Rails 2.3 editing lib/tasks/rspec.rake like in this commit worked for me:
https://github.com/dchelimsky/rspec-rails/pull/11/files

Answer 18

Install rake 0.8.7 and uninstall 0.9.2.2
$ gem install rake -v 0.8.7
$ gem uninstall rake -v 0.9.2.2
Now use
$ bundle exec rake db:migrate
i think this will help you
;)

Answer 19

Run
bundle exec rake db:migrate
it works for me.