Bug 1007631 - require 'ammeter/init' fails
require 'ammeter/init' fails
Product: Fedora
Classification: Fedora
Component: rubygem-ammeter (Show other bugs)
Unspecified Unspecified
unspecified Severity unspecified
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Assigned To: Josef Stribny
Fedora Extras Quality Assurance
Depends On:
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Reported: 2013-09-12 22:34 EDT by Ken Dreyer
Modified: 2016-01-04 00:51 EST (History)
3 users (show)

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Doc Type: Bug Fix
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Last Closed: 2014-04-07 03:39:31 EDT
Type: Bug
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Description Ken Dreyer 2013-09-12 22:34:03 EDT
Description of problem:
I'm attempting to package rubygem-acts-as-taggable-on. When I run the test suite on Fedora 20, "require 'ammeter/init'" causes a crash. (On Fedora 19 the test suite will run without error.)

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. Create a test.rb file
2. Populate the test file with "require 'ammeter/init'"
3. Run "ruby test.rb"

Actual results:
A backtrace appears, complaining about "uninitialized constant Rails::VERSION". For example:

$ ruby test.rb 
/usr/share/gems/gems/rspec-rails-2.14.0/lib/rspec/rails/example/rails_example_group.rb:10:in `<module:RailsExampleGroup>': uninitialized constant Rails::VERSION (NameError)
	from /usr/share/gems/gems/rspec-rails-2.14.0/lib/rspec/rails/example/rails_example_group.rb:7:in `<module:Rails>'
	from /usr/share/gems/gems/rspec-rails-2.14.0/lib/rspec/rails/example/rails_example_group.rb:6:in `<module:RSpec>'
	from /usr/share/gems/gems/rspec-rails-2.14.0/lib/rspec/rails/example/rails_example_group.rb:5:in `<top (required)>'
	from /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:51:in `require'
	from /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:51:in `require'
	from /usr/share/gems/gems/ammeter-0.2.9/lib/ammeter/rspec/generator/example/generator_example_group.rb:4:in `<top (required)>'
	from /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:51:in `require'
	from /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:51:in `require'
	from /usr/share/gems/gems/ammeter-0.2.9/lib/ammeter/rspec/generator/example.rb:2:in `<top (required)>'
	from /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:51:in `require'
	from /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:51:in `require'
	from /usr/share/gems/gems/ammeter-0.2.9/lib/ammeter/init.rb:1:in `<top (required)>'
	from /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:116:in `require'
	from /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:116:in `rescue in require'
	from /usr/share/rubygems/rubygems/core_ext/kernel_require.rb:122:in `require'
	from test.rb:1:in `<main>'

Expected results:
No output (ammeter should load successfully).

Additional info:
I've narrowed the problem to this line:

require 'ammeter/rspec/generator/example/generator_example_group'

Also, adding a monkey-patch to the top of test.rb will avoid the crash:

module Rails
  module VERSION
    MAJOR = 4
    MINOR = 0
    TINY = 0
    PRE = ""

    STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")

  def self.version

This doesn't seem ideal, because I would need to add this monkey patch to the gem that I'm attempting to package (acts-as-taggable-on). What is the best solution?
Comment 1 Josef Stribny 2013-09-23 06:23:39 EDT

you need to require 'rails' since the file you mentioned [1] relies on the Rails VERSION constant as requiring 'ammeter' already does [2]. Monkey patch is a bad idea, rubygem-ammeter has rubygem-railties as a dependency. Just require Rails before 'ammeter/init' or require 'ammeter' instead.

The order of requires should be probably changed in ammeter/init.rb so that rails requirement comes first. I filled the pull request to upstream[3].

[1] https://github.com/rspec/rspec-rails/blob/master/lib/rspec/rails/example/rails_example_group.rb#L10
[2] https://github.com/alexrothenberg/ammeter/blob/master/lib/ammeter.rb
[3] https://github.com/alexrothenberg/ammeter/pull/22
Comment 2 Ken Dreyer 2013-09-23 08:51:12 EDT
Cool, thanks. On acts-as-taggable-on's side, do you think it would be appropriate for acts-as-taggable-on to first try loading "ammeter/init", catch the LoadError, and then try "ammeter"?
Comment 3 Josef Stribny 2013-09-23 09:49:17 EDT
Well, I am not sure. First of all it might be that upstream now prefers requiring just 'ammeter'. If the test suite works with requiring 'ammeter', I would change that line to load ammeter (using sed for example). You can change it back in the spec file when it's fixed and you know that upstream of acts-as-taggable-on continue to use it and that it has been fixed.
Comment 4 Ken Dreyer 2013-09-23 10:43:49 EDT
I was wondering if the ammeter upstream developer has altered his preference for "ammeter" vs "ammeter/init". If that's the case, how can we make ammeter consumers (like acts-as-taggable-on) be forwards- and backwards- compatible?
Comment 5 Josef Stribny 2014-04-07 03:39:31 EDT
Unfortunately upstream is sort of unresponsive in this matter. It's probably not a bug from their point of view. Please require just 'ammeter' for now.
Comment 6 Ken Dreyer 2014-12-06 13:12:50 EST
Thanks Josef. And just to close the loop as far as acts-as-taggable-on is concerned, upstream has removed the dependency on ammeter.

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