# Mixing C extension classes with ruby classes **URL:** \ **Category:** Ruby\ **Created:** [September 20, 2006, 2:53am UTC](https://www.ruby-forum.com/t/mixing-c-extension-classes-with-ruby-classes/69299 "2006-09-20T02:53:33Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![snacktime](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/7feea3/32.png) [@snacktime](https://www.ruby-forum.com/u/snacktime)\ **Post date:** [September 20, 2006, 2:53am UTC](https://www.ruby-forum.com/t/mixing-c-extension-classes-with-ruby-classes/69299/1 "2006-09-20T02:53:33Z")
I have a C extension that defines a module and two classes in that module. I was looking at mongrel and mongrel also has a mongrel.rb file that defines the module and classes that are also defined in the C extension. However when I define the module in modulename.rb which also has a C extension that defines the module using rb\_define\_module, the definition in modulename.rb takes precedence, and C module/class definitions disappear. I can post some code if needed, but maybe it’s just something simple I am missing. Chris ---
**Author:** ![snacktime](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/7feea3/32.png) [@snacktime](https://www.ruby-forum.com/u/snacktime)\ **Post date:** [September 20, 2006, 4:28pm UTC](https://www.ruby-forum.com/t/mixing-c-extension-classes-with-ruby-classes/69299/2 "2006-09-20T16:28:55Z")
Hi, At Wed, 20 Sep 2006 09:51:34 +0900, snacktime wrote in [ruby-talk:215221]: > I have a C extension that defines a module and two classes in that > module. I was looking at mongrel and mongrel also has a mongrel.rb > file that defines the module and classes that are also defined in the > C extension. However when I define the module in modulename.rb which > also has a C extension that defines the module using rb\_define\_module, > the definition in modulename.rb takes precedence, and C module/class > definitions disappear. Do you require modulename.so in modulename.rb?