Rspec error: Diff is not a module

0
votes

Following Ryan Bates railscast brand new to rspec.

I get

Guard is now watching at '/Users/thealey/Source/rpd31'
Guard::RSpec is running, with RSpec 2!
Running all specs
/Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/diff-lcs-1.1.3/lib/diff/lcs.rb:3:in `': Diff is not a module (TypeError)
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/activesupport-3.0.10/lib/active_support/dependencies.rb:239:in `require'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/activesupport-3.0.10/lib/active_support/dependencies.rb:239:in `block in require'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/activesupport-3.0.10/lib/active_support/dependencies.rb:227:in `load_dependency'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/activesupport-3.0.10/lib/active_support/dependencies.rb:239:in `require'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/rspec-expectations-2.6.0/lib/rspec/expectations/differ.rb:1:in `'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/activesupport-3.0.10/lib/active_support/dependencies.rb:239:in `require'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/activesupport-3.0.10/lib/active_support/dependencies.rb:239:in `block in require'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/activesupport-3.0.10/lib/active_support/dependencies.rb:227:in `load_dependency'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/activesupport-3.0.10/lib/active_support/dependencies.rb:239:in `require'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/rspec-expectations-2.6.0/lib/rspec/expectations.rb:9:in `'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/activesupport-3.0.10/lib/active_support/dependencies.rb:239:in `require'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/activesupport-3.0.10/lib/active_support/dependencies.rb:239:in `block in require'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/activesupport-3.0.10/lib/active_support/dependencies.rb:227:in `load_dependency'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/activesupport-3.0.10/lib/active_support/dependencies.rb:239:in `require'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/rspec-core-2.6.4/lib/rspec/core/expecting/with_rspec.rb:1:in `'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/activesupport-3.0.10/lib/active_support/dependencies.rb:239:in `require'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/activesupport-3.0.10/lib/active_support/dependencies.rb:239:in `block in require'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/activesupport-3.0.10/lib/active_support/dependencies.rb:227:in `load_dependency'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/activesupport-3.0.10/lib/active_support/dependencies.rb:239:in `require'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/rspec-core-2.6.4/lib/rspec/core/configuration.rb:207:in `block in expect_with'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/rspec-core-2.6.4/lib/rspec/core/configuration.rb:202:in `each'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/rspec-core-2.6.4/lib/rspec/core/configuration.rb:202:in `expect_with'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/rspec-core-2.6.4/lib/rspec/core/configuration.rb:184:in `expectation_frameworks'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/rspec-core-2.6.4/lib/rspec/core/configuration.rb:413:in `configure_expectation_framework'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/rspec-core-2.6.4/lib/rspec/core/example_group.rb:165:in `ensure_example_groups_are_configured'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/rspec-core-2.6.4/lib/rspec/core/example_group.rb:178:in `set_it_up'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/rspec-core-2.6.4/lib/rspec/core/example_group.rb:141:in `subclass'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/rspec-core-2.6.4/lib/rspec/core/example_group.rb:129:in `describe'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/rspec-core-2.6.4/lib/rspec/core/dsl.rb:5:in `describe'
    from /Users/thealey/Source/rpd31/spec/requests/create_projects_spec.rb:3:in `'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/rspec-core-2.6.4/lib/rspec/core/configuration.rb:419:in `load'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/rspec-core-2.6.4/lib/rspec/core/configuration.rb:419:in `block in load_spec_files'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/rspec-core-2.6.4/lib/rspec/core/configuration.rb:419:in `map'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/rspec-core-2.6.4/lib/rspec/core/configuration.rb:419:in `load_spec_files'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/rspec-core-2.6.4/lib/rspec/core/command_line.rb:18:in `run'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/rspec-core-2.6.4/lib/rspec/core/runner.rb:80:in `run_in_process'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/rspec-core-2.6.4/lib/rspec/core/runner.rb:69:in `run'
    from /Users/thealey/.rvm/gems/ruby-1.9.2-p290@rails31/gems/rspec-core-2.6.4/lib/rspec/core/runner.rb:11:in `block in autorun'

Gemfile is 

source 'http://rubygems.org'

gem 'rails', '3.0.10'


gem 'mysql2', '0.2.7'


gem "authlogic"
gem 'activesupport', '3.0.10'
gem 'cancan'
gem 'will_paginate', "~> 3.0"
gem 'calendar_date_select', :git => 'http://github.com/paneq/calendar_date_select.git', :branch => 'rails3test'
gem 'bluecloth'
gem 'rdiscount'
gem 'capybara'
gem 'paperclip'
gem 'mail'

any ideas about how to troubleshoot this appreciated.

Edit: I removed commented out lines from Gemfile.

I put diff into my gemfile no change.

This is the output of bundle.

Using rake (0.9.2)
Using abstract (1.0.0)
Using activesupport (3.0.10)
Using builder (2.1.2)
Using i18n (0.5.0)
Using activemodel (3.0.10)
Using erubis (2.6.6)
Using rack (1.2.3)
Using rack-mount (0.6.14)
Using rack-test (0.5.7)
Using tzinfo (0.3.29)
Using actionpack (3.0.10)
Using mime-types (1.16)
Using polyglot (0.3.2)
Using treetop (1.4.10)
Using mail (2.2.19)
Using actionmailer (3.0.10)
Using arel (2.0.10)
Using activerecord (3.0.10)
Using activeresource (3.0.10)
Using addressable (2.2.6)
Using archive-tar-minitar (0.5.2)
Using authlogic (3.0.3)
Using crack (0.1.8)
Using httparty (0.7.8)
Using multipart-post (1.1.3)
Using faraday (0.7.4)
Using multi_json (1.0.3)
Using oauth2 (0.5.0)
Using bitly (0.6.1)
Using bluecloth (2.1.0)
Using bson (1.3.1)
Using bson_ext (1.3.1)
Using bundler (1.0.18)
Using calendar_date_select (1.16.1) from http://github.com/paneq/calendar_date_select.git (at rails3test)
Using cancan (1.6.5)
Using nokogiri (1.5.0)
Using ffi (1.0.9)
Using childprocess (0.2.2)
Using json_pure (1.6.0)
Using rubyzip (0.9.4)
Using selenium-webdriver (2.5.0)
Using xpath (0.1.4)
Using capybara (1.1.1)
Using chronic (0.6.4)
Using cocaine (0.2.0)
Using colored (1.2)
Using columnize (0.3.4)
Using daemons (1.1.4)
Using diff (0.3.6)
Using diff-lcs (1.1.3)
Using eventmachine (0.12.10)
Using factory_girl (2.1.0)
Using rdoc (3.9.4)
Using thor (0.14.6)
Using railties (3.0.10)
Using factory_girl_rails (1.2.0)
Using git_remote_branch (0.3.0)
Using googlecharts (1.6.7)
Using gravtastic (3.2.6)
Using guard (0.6.3)
Using guard-rspec (0.4.5)
Using htmldiff (0.0.1)
Using ruby_core_source (0.1.5)
Using linecache19 (0.5.12)
Using mysql2 (0.2.7)
Using net-ldap (0.2.2)
Using net-ping (1.5.0)
Using paperclip (2.4.1)
Using rails (3.0.10)
Using rdiscount (1.6.8)
Using ri_cal (0.8.8)
Using riddle (1.4.0)
Using rspec-core (2.6.4)
Using rspec-expectations (2.6.0)
Using rspec-mocks (2.6.0)
Using rspec (2.6.0)
Using rspec-rails (2.6.1)
Using ruby-debug-base19 (0.11.25)
Using ruby-debug19 (0.11.6)
Using seed_dump (0.3.4)
Using thin (1.2.11)
Using thinking-sphinx (2.0.1)
Using time_diff (0.2.1)
Using will_paginate (3.0.pre)
Your bundle is complete! Use `bundle show [gemname]` to see where a bundled gem is installed.
1
ruby-on-railsrspec
have you tried to install gem for Diff? – Karoly Horvath
Feel free to delete lines that aren't relevant, too, like the gems you're not including. – Dave Newton

1 Answers

1
votes

I had the identical issue. In my case I had a model class called Diff (defined in diff.rb) which led to the issue. I've renamed my class/module and all is well now. I'm somewhat disappointed that this sort of namespace collision could occur.

Other users have also encountered issues with collisions originating from other gems (eg: https://github.com/sunaku/tork/issues/3). If I were troubleshooting the issue, I'd go to your gem directory (use bundle show for any one of your gems to find where they live) and run

find . -name diff.rb

That should tell you all of the libraries that contain a diff.rb file. I'd be looking for one of the more obscure/less actively maintained gems to be the culprit. You'll likely need to find an alternative gem (or contribute a fix the offending gem!) to fix the issue.