# Rails gem version relationship to AR gem versions

**URL:** <https://www.ruby-forum.com/t/rails-gem-version-relationship-to-ar-gem-versions/130416>\
**Category:** Rails\
**Created:** [February 28, 2008, 1:01am UTC](https://www.ruby-forum.com/t/rails-gem-version-relationship-to-ar-gem-versions/130416 "2008-02-28T01:01:34Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![weyus](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/w/7ab992/32.png) [@weyus](https://www.ruby-forum.com/u/weyus)\
**Post date:** [February 28, 2008, 1:01am UTC](https://www.ruby-forum.com/t/rails-gem-version-relationship-to-ar-gem-versions/130416/1 "2008-02-28T01:01:34Z")

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I have several versions of Rails on my box.

How does a given version of Rails know which version of the ActiveRecord  
gem to use? For example, how does Rails 1.2.6 load AR version 1.15.6?

Thanks,  
Wes