Multiple enum_attr's and annotate gem

[jgrocho]

Given a model that looks like

class user < ActiveRecord::Base
    enum_attr :status %w{suspended pending approved}
    enum_attr :role %w{regular moderator admin}
end

When attempting to run annotate on that model,
Then I get the following error

Unable to annotate user.rb: #<MetaProgramming::AliasMethodChainError: method_missing_without_enumerated_attribute already exists.  Circular references not permitted.>

Nothing annotated.

I seem to have narrowed it down to the fact that enum_attr is being used twice in the model. Removing (or commenting out) one or both allows the model to be annotated as expected, even when both enums are defined in the migration. My guess is that method_missing_without_enumerated_attribute is being defined each time enum_attr is used, but I don't know enough about the internals of enumerated_attribute to determine this.

[rchekaluk]

More in-depth stack trace:

$ bundle exec annotate --position before
/usr/local/rvm/gems/ruby-2.0.0-p353/gems/meta_programming-0.2.2/lib/meta_programming/object.rb:43:in `block in safe_alias_method_chain': method_missing_without_enumerated_attribute already exists.  Circular references not permitted. (MetaProgramming::AliasMethodChainError)
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/meta_programming-0.2.2/lib/meta_programming/object.rb:39:in `class_eval'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/meta_programming-0.2.2/lib/meta_programming/object.rb:39:in `safe_alias_method_chain'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/meta_programming-0.2.2/lib/meta_programming/object.rb:66:in `define_chained_method'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/enumerated_attribute-0.2.16/lib/enumerated_attribute/integrations/active_record.rb:103:in `singleton class'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/enumerated_attribute-0.2.16/lib/enumerated_attribute/integrations/active_record.rb:90:in `block in define_enumerated_attribute_new_method'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/enumerated_attribute-0.2.16/lib/enumerated_attribute/integrations/active_record.rb:89:in `class_eval'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/enumerated_attribute-0.2.16/lib/enumerated_attribute/integrations/active_record.rb:89:in `define_enumerated_attribute_new_method'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/enumerated_attribute-0.2.16/lib/enumerated_attribute/attribute.rb:45:in `create_enumerated_attribute'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/enumerated_attribute-0.2.16/lib/enumerated_attribute.rb:13:in `enumerated_attribute'
    from /redacted/app/models/redacted.rb:77:in `<class:Redacted>'
    from /redacted/app/models/redacted.rb:61:in `<top (required)>'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.16/lib/active_support/dependencies.rb:469:in `load'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.16/lib/active_support/dependencies.rb:469:in `block in load_file'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.16/lib/active_support/dependencies.rb:639:in `new_constants_in'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.16/lib/active_support/dependencies.rb:468:in `load_file'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.16/lib/active_support/dependencies.rb:353:in `require_or_load'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.16/lib/active_support/dependencies.rb:502:in `load_missing_constant'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.16/lib/active_support/dependencies.rb:192:in `block in const_missing'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.16/lib/active_support/dependencies.rb:190:in `each'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.16/lib/active_support/dependencies.rb:190:in `const_missing'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.16/lib/active_support/dependencies.rb:514:in `load_missing_constant'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.16/lib/active_support/dependencies.rb:192:in `block in const_missing'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.16/lib/active_support/dependencies.rb:190:in `each'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.16/lib/active_support/dependencies.rb:190:in `const_missing'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.16/lib/active_support/inflector/methods.rb:230:in `block in constantize'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.16/lib/active_support/inflector/methods.rb:229:in `each'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.16/lib/active_support/inflector/methods.rb:229:in `constantize'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.16/lib/active_support/inflector/methods.rb:260:in `safe_constantize'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.16/lib/active_support/core_ext/string/inflections.rb:66:in `safe_constantize'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/actionpack-3.2.16/lib/action_controller/metal/params_wrapper.rb:152:in `_default_wrap_model'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/actionpack-3.2.16/lib/action_controller/metal/params_wrapper.rb:169:in `_set_wrapper_defaults'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/actionpack-3.2.16/lib/action_controller/metal/params_wrapper.rb:133:in `inherited'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/actionpack-3.2.16/lib/abstract_controller/railties/routes_helpers.rb:7:in `block (2 levels) in with'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/actionpack-3.2.16/lib/action_controller/railties/paths.rb:7:in `block (2 levels) in with'
    from /redacted/app/controllers/redacted_controller.rb:5:in `<top (required)>'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.16/lib/active_support/dependencies.rb:469:in `load'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.16/lib/active_support/dependencies.rb:469:in `block in load_file'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.16/lib/active_support/dependencies.rb:639:in `new_constants_in'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.16/lib/active_support/dependencies.rb:468:in `load_file'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.16/lib/active_support/dependencies.rb:353:in `require_or_load'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.16/lib/active_support/dependencies.rb:313:in `depend_on'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/activesupport-3.2.16/lib/active_support/dependencies.rb:225:in `require_dependency'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/railties-3.2.16/lib/rails/engine.rb:444:in `block (2 levels) in eager_load!'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/railties-3.2.16/lib/rails/engine.rb:443:in `each'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/railties-3.2.16/lib/rails/engine.rb:443:in `block in eager_load!'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/railties-3.2.16/lib/rails/engine.rb:441:in `each'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/railties-3.2.16/lib/rails/engine.rb:441:in `eager_load!'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/railties-3.2.16/lib/rails/railtie/configurable.rb:30:in `method_missing'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/annotate-2.6.0/lib/annotate.rb:109:in `eager_load'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/gems/annotate-2.6.0/bin/annotate:146:in `<top (required)>'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/bin/annotate:23:in `load'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/bin/annotate:23:in `<main>'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/bin/ruby_executable_hooks:15:in `eval'
    from /usr/local/rvm/gems/ruby-2.0.0-p353/bin/ruby_executable_hooks:15:in `<main>'