Sorry ignore the :013-:016 there. Try to multitask / clean-up that and
failed.
On Tuesday, February 18, 2014 4:14:59 PM UTC-5, Gary Weaver wrote:
>
> Notice how a class that is not available is a NameError and a constant
> unloaded from ActiveSupport::Dependencies or via remove_const called on the
> module is a RuntimeError about a circular dependency...
>
> The class I unloaded has no references to or from anywhere else.
>
> Just to show how a missing constant behaves normally:
>
> Loading development environment (Rails 4.0.2)
> 2.1.0 :001 > Nothing::Nothing.to_s
> NameError: uninitialized constant Nothing
> from (irb):1
> from /path/to/gemset/railties-4.0.2/lib/rails/commands/console.rb:90:in
> `start'
> from /path/to/gemset/railties-4.0.2/lib/rails/commands/console.rb:9:in
> `start'
> from /path/to/gemset/railties-4.0.2/lib/rails/commands.rb:62:in `<top
> (required)>'
> from bin/rails:4:in `require'
> from bin/rails:4:in `<main>'
>
> Now, how a missing constant behaves after being undefined by Rails 4.0.2:
>
> 2.1.0 :002 > Object.const_defined? 'MyModule::MyClass'
> => false
> 2.1.0 :003 > MyModule::MyClass.to_s
> => "MyModule::MyClass"
> 2.1.0 :004 > Object.const_defined? 'MyModule::MyClass'
> => true
> 2.1.0 :005 > ActiveSupport::Dependencies.remove_constant MyModule::MyClass
> => MyModule::MyClass
> 2.1.0 :006 > Object.const_defined? 'MyModule::MyClass'
> => false
> 2.1.0 :007 > MyModule::MyClass.to_s
> RuntimeError: Circular dependency detected while autoloading constant
> MyModule::MyClass
> from
> /path/to/gemset/activesupport-4.0.2/lib/active_support/dependencies.rb:461:in
> `load_missing_constant'
> from
> /path/to/gemset/activesupport-4.0.2/lib/active_support/dependencies.rb:184:in
> `const_missing'
> from (irb):7
> from /path/to/gemset/railties-4.0.2/lib/rails/commands/console.rb:90:in
> `start'
> from /path/to/gemset/railties-4.0.2/lib/rails/commands/console.rb:9:in
> `start'
> from /path/to/gemset/railties-4.0.2/lib/rails/commands.rb:62:in `<top
> (required)>'
> from bin/rails:4:in `require'
> from bin/rails:4:in `<main>'
> 2.1.0 :008 > load
> "#{Rails.root}/app/an_autoloaded_dir/my_module/my_class.rb"
> => true
> 2.1.0 :009 > MyModule::MyClass.to_s
> => "MyModule::MyClass"
> 2.1.0 :010 > MyModule.send(:remove_const, :MyClass)
> => MyModule::MyClass
> 2.1.0 :011 > Object.const_defined? 'MyModule::MyClass'
> => false
> 2.1.0 :012 > MyModule::MyClass.to_s
> RuntimeError: Circular dependency detected while autoloading constant
> MyModule::MyClass
> from
> /path/to/gemset/activesupport-4.0.2/lib/active_support/dependencies.rb:461:in
> `load_missing_constant'
> from
> /path/to/gemset/activesupport-4.0.2/lib/active_support/dependencies.rb:184:in
> `const_missing'
> from (irb):23
> from /path/to/gemset/railties-4.0.2/lib/rails/commands/console.rb:90:in
> `start'
> from /path/to/gemset/railties-4.0.2/lib/rails/commands/console.rb:9:in
> `start'
> from /path/to/gemset/railties-4.0.2/lib/rails/commands.rb:62:in `<top
> (required)>'
> from bin/rails:4:in `require'
> from bin/rails:4:in `<main>'
> 2.1.0 :013 > load "#{Rails.root}/app/workflow/my_module/my_class.rb"
> => true
> 2.1.0 :015 > MyModule::MyClass.to_s
> NameError: uninitialized constant MyModule
> from (irb):26
> from /path/to/gemset/railties-4.0.2/lib/rails/commands/console.rb:90:in
> `start'
> from /path/to/gemset/railties-4.0.2/lib/rails/commands/console.rb:9:in
> `start'
> from /path/to/gemset/railties-4.0.2/lib/rails/commands.rb:62:in `<top
> (required)>'
> from bin/rails:4:in `require'
> from bin/rails:4:in `<main>'
> 2.1.0 :016 > MyModule::MyClass.to_s
> => "MyModule::MyClass"
>
> I'm curious what the circular dependency would be there, since there are
> no other references to the class, afaik.
>
> Thanks!
>
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