Undefined method 'task' using Rake 0.9.0

Question

I just updated Rake to the latest version (0.9.0.beta.4) and the rake command ends up with the following error message:

rake aborted!
undefined method `task' for #<Anelis::Application:0x9223b6c>

Here is the trace:

undefined method `task' for #<Anelis::Application:0x97ef80c>
/usr/local/rvm/gems/ruby-1.9.2-p136/gems/railties-3.0.3/lib/rails/application.rb:214:in `initialize_tasks'
/usr/local/rvm/gems/ruby-1.9.2-p136/gems/railties-3.0.3/lib/rails/application.rb:139:in `load_tasks'
/usr/local/rvm/gems/ruby-1.9.2-p136/gems/railties-3.0.3/lib/rails/application.rb:77:in `method_missing'
/home/amokrane/Documents/prog/web/learning_rails/anelis/Rakefile:7:in `load_string'
/usr/local/rvm/gems/ruby-1.9.2-p136/gems/rake-0.9.0.beta.4/lib/rake/environment.rb:28:in `eval'
/usr/local/rvm/gems/ruby-1.9.2-p136/gems/rake-0.9.0.beta.4/lib/rake/environment.rb:28:in `load_string'
/usr/local/rvm/gems/ruby-1.9.2-p136/gems/rake-0.9.0.beta.4/lib/rake/environment.rb:16:in `load_rakefile'
/usr/local/rvm/gems/ruby-1.9.2-p136/gems/rake-0.9.0.beta.4/lib/rake/application.rb:495:in `raw_load_rakefile'
/usr/local/rvm/gems/ruby-1.9.2-p136/gems/rake-0.9.0.beta.4/lib/rake/application.rb:78:in `block in load_rakefile'
/usr/local/rvm/gems/ruby-1.9.2-p136/gems/rake-0.9.0.beta.4/lib/rake/application.rb:129:in `standard_exception_handling'
/usr/local/rvm/gems/ruby-1.9.2-p136/gems/rake-0.9.0.beta.4/lib/rake/application.rb:77:in `load_rakefile'
/usr/local/rvm/gems/ruby-1.9.2-p136/gems/rake-0.9.0.beta.4/lib/rake/application.rb:61:in `block in run'
/usr/local/rvm/gems/ruby-1.9.2-p136/gems/rake-0.9.0.beta.4/lib/rake/application.rb:129:in `standard_exception_handling'
/usr/local/rvm/gems/ruby-1.9.2-p136/gems/rake-0.9.0.beta.4/lib/rake/application.rb:59:in `run'
/usr/local/rvm/gems/ruby-1.9.2-p136/gems/rake-0.9.0.beta.4/bin/rake:31:in `<top (required)>'
/usr/local/rvm/gems/ruby-1.9.2-p136/bin/rake:19:in `load'
/usr/local/rvm/gems/ruby-1.9.2-p136/bin/rake:19:in `<main>'

Anyone experienced the same issue? What could possibly be wrong? Note that I am running Rails 3.0.3, you may also be interested in the content of my Gemfile:

source 'http://rubygems.org'
gem 'rails', '3.0.3'
gem 'sqlite3-ruby', :require => 'sqlite3'
gem 'mysql2'
gem 'legacy_data'
gem 'resources_controller', :git => 'git://github.com/ianwhite/resources_controller'
gem 'will_paginate', '3.0.pre' # pagination
gem 'jquery-rails', '>= 0.2.6'
gem "rmagick" # sudo aptitude install libmagick9-dev
gem "paperclip", "~> 2.3"
gem "nested_form", :git => "git://github.com/madebydna/nested_form.git"
gem "meta_search"
gem "hirb"
gem "devise"
gem "rails_admin", :git => "git://github.com/sferik/rails_admin.git"

How can I fix this problem?

Answer 1

I use rvm, but uninstalling doesn't help me. So I manually remove all 0.9 files from .rvm/gems/ruby@global directory and everything becomes as before!

Answer 2

without the need to uninstall Rake 0.9.x, add

gem 'rake', '~> 0.8.7'

to your Gemfile and just type

bundle exec rake -T

Answer 3

I've created an issue for rails_admin about this same error.

The answer:

This is a general Rails problem: http://twitter.com/dhh/status/71966528744071169

There should be a 3.0.8 release soon that fixes it. In the mean time, you can add the following line to your Gemfile:

gem 'rake', '~> 0.8.7'

It's a problem in Rake (0.9.0), it was announced by DHH on Twitter.

Rake 0.9, which was released yesterday, broke Rails (and others). While we wait for a fix, you'll want gem 'rake', '0.8.7' in your Gemfile.

Answer 4

Note: This was just fixed in Rails 3.0.8

The new version of Rake does not put its DSL commands (task, file, desc, import, etc.) in the root of the Object namespace anymore (placing them in Object meant every object has a task command, not very nice. The DSL commands are available by mixing in the Rake::DSL module into any module needing the commands.

Until Ruby on Rails is updated to work with Rake 0.9.x, put the following in your project Rakefile after "require rake" and before the call to Application.load_tasks:

class Rails::Application
  include Rake::DSL if defined?(Rake::DSL)
end

Answer 5

This has been fixed in Ruby on Rails 3.0.8.rc1 which should be released in a few days time.

Answer 6

As explained in mordaroso's answer, there is a problem in Rake 0.9.0. You need to temporarily downgrade Rake in order to avoid it:

1. run: gem uninstall rake -v 0.9 (add sudo unless you use rvm)

2. add to your Gemfile: gem 'rake', '~> 0.8.7'

3. and then run: bundle update

You can skip the first step, but then you have to run rake using bundle exec, for example:

bundle exec rake db:migrate

Otherwise you get the following error.

rake aborted!
You have already activated rake 0.9.0, but your Gemfile requires rake 0.8.7. Consider using bundle exec.

Update

As Alex Chaffee noticed in a comment for Pablo Cantero's answer, that you might need to do the following to uninstall Rake if you still see the problem

rvm use @global && gem uninstall rake -v 0.9.0
rvm use @       && gem uninstall rake -v 0.9.0

Also try the solution suggested in Duke's answer.