Use a method compatible with mongoid-observers to determinine the ver…

…sion of Mongoid.
mongoid · Feb 9, 2015 · 8303884 · 8303884
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -3,6 +3,7 @@
 
 * [#127](https://github.com/aq1018/mongoid-history/pull/127) - Fix gem naming per [rubygems](http://guides.rubygems.org/name-your-gem/) specs, now you can `require 'mongoid/history'` - [@nofxx](https://github.com/nofxx).
 * [#129](https://github.com/aq1018/mongoid-history/pull/129) - Support multiple levels of embedded polimorphic documents - [@BrunoChauvet](https://github.com/BrunoChauvet).
+* [#123](https://github.com/aq1018/mongoid-history/pull/123): Use a method compatible with mongoid-observers to determinine the version of Mongoid - [@zeitnot](https://github.com/zeitnot).
 * Your contribution here.
 
 0.4.4 (7/29/2014)

diff --git a/lib/mongoid/history/mongoid.rb b/lib/mongoid/history/mongoid.rb
@@ -1,7 +1,7 @@
 module Mongoid
   module History
     def self.mongoid3?
-      ::Mongoid.const_defined? :Observer # deprecated in Mongoid 4.x
+      Mongoid::VERSION =~ /^3\./
     end
   end
 end