Change some version checks to use ActiveRecord.

This allow using ActiveRecord fixtures without pulling in all of Rails.

Author: dpogue

Changelog.md

@@ -10,6 +10,9 @@ Bug fixes
 
 * Fixes "warning: instance variable @orig\_routes not initialized" raised by
   controller specs when `--warnings` are enabled. (Andy Lindeman)
+* Where possible, check against the version of ActiveRecord, rather than
+  Rails. It is possible to use some of rspec-rails without all of Rails.
+  (Darryl Pogue)
 
 ### 2.14.0 / 2013-07-06
 [full changelog](http://github.com/rspec/rspec-rails/compare/v2.14.0.rc1...v2.14.0)

features/model_specs/errors_on.feature

@@ -10,7 +10,7 @@ Feature: errors_on
         validates_presence_of :name
 
         # In Rails 4, mass assignment protection is implemented on controllers
-        attr_accessible :name if ::Rails::VERSION::STRING < '4'
+        attr_accessible :name if ::ActiveRecord::VERSION::STRING < '4'
 
         validates_length_of :name, :minimum => 10, :on => :publication
       end

lib/rspec/rails/extensions/active_record/base.rb

@@ -10,7 +10,7 @@ module ActiveRecord
           #     ModelClass.should have(:no).records
           #     ModelClass.should have(1).record
           #     ModelClass.should have(n).records
-          if ::Rails::VERSION::STRING >= '4'
+          if ::ActiveRecord::VERSION::STRING >= '4'
             def records
               all.to_a
             end

lib/rspec/rails/fixture_support.rb

@@ -4,7 +4,7 @@ module Rails
       module FixtureSupport
         extend ActiveSupport::Concern
         include RSpec::Rails::SetupAndTeardownAdapter
-        include RSpec::Rails::MiniTestLifecycleAdapter if ::Rails::VERSION::STRING > '4'
+        include RSpec::Rails::MiniTestLifecycleAdapter if ::ActiveRecord::VERSION::STRING > '4'
         include RSpec::Rails::TestUnitAssertionAdapter
         include ActiveRecord::TestFixtures