superclass mismatch for class Tempfile

[Rodrigo Felix]

I've been facing a problem when generating a model (or controller, ...). I'm using rails 2.3.8 and ruby 1.8.7.
Has anybody been facing anything like this?

script/generate controller test
/usr/lib/ruby/1.8/tempfile.rb:12: superclass mismatch for class Tempfile (TypeError)
    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
    from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/dependencies.rb:156:in `require'
    from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/dependencies.rb:521:in `new_constants_in'
    from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/dependencies.rb:156:in `require'
    from /usr/lib/ruby/gems/1.8/gems/rails-2.3.8/lib/rails_generator/commands.rb:4
    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
    from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/dependencies.rb:156:in `require'
    from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/dependencies.rb:521:in `new_constants_in'
    from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/dependencies.rb:156:in `require'
    from /usr/lib/ruby/gems/1.8/gems/rails-2.3.8/lib/rails_generator.rb:39
    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
    from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/dependencies.rb:156:in `require'
    from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/dependencies.rb:521:in `new_constants_in'
    from /usr/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/dependencies.rb:156:in `require'
    from /usr/lib/ruby/gems/1.8/gems/rails-2.3.8/lib/commands/generate.rb:2
    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
    from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
    from script/generate:3


Att.

Rodrigo Felix de Almeida
Promine Tecnologia da Informação - www.promine.com.br
Project Manager
Sun Certified Java Programmer

[Raja Venkataraman]

Rodrigo Felix wrote:
> I've been facing a problem when generating a model (or controller, ...).
> I'm
> using rails 2.3.8 and ruby 1.8.7.
> Has anybody been facing anything like this?

Do you have 2 instances of TempFile (tempfile.rb) or DelegateClass
(delegate.rb) ? Googling around seems to suggest this as a problem.

-- raja
--
Posted via http://www.ruby-forum.com/.

[Rodrigo Felix]

OK, but how can I know which class is instantiating TempFile or DelegateClass? I guess it is related to some plugin, but I`m not sure.

Att.

Rodrigo Felix de Almeida
Promine Tecnologia da Informação - www.promine.com.br
Project Manager
Sun Certified Java Programmer

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[Rodrigo Felix]

I found the problem. I was defining a new method content_type in the class Tempfile.

class Tempfile
  def content_type
    mime_type = IO.popen("file --brief --mime #{path}").gets unless path.blank?
    mime_type
  end
end

How can I make this without breaking generators? I've already tried the following one (exactly how it is on the tempfile.rb), but it didn't work:

class Tempfile < DelegateClass(File)
   ...
end

Should I enclose it by module SomeModuleName ... end ?

Thanks in advance.

Att.

Rodrigo Felix de Almeida
Promine Tecnologia da Informação - www.promine.com.br
Project Manager
Sun Certified Java Programmer