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-rw-r--r--activerecord/lib/active_record/base.rb9
-rw-r--r--activerecord/test/cases/base_test.rb13
2 files changed, 22 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/base.rb b/activerecord/lib/active_record/base.rb
index ebea4252f9..fd52038647 100644
--- a/activerecord/lib/active_record/base.rb
+++ b/activerecord/lib/active_record/base.rb
@@ -1811,6 +1811,15 @@ MSG
@attributes.frozen?
end
+ # Allows sort on objects
+ def <=>(other_object)
+ if other_object.is_a?(self.class)
+ self.to_key <=> other_object.to_key
+ else
+ nil
+ end
+ end
+
# Backport dup from 1.9 so that initialize_dup() gets called
unless Object.respond_to?(:initialize_dup)
def dup # :nodoc:
diff --git a/activerecord/test/cases/base_test.rb b/activerecord/test/cases/base_test.rb
index 2224097f04..5fef3faab9 100644
--- a/activerecord/test/cases/base_test.rb
+++ b/activerecord/test/cases/base_test.rb
@@ -478,6 +478,19 @@ class BasicsTest < ActiveRecord::TestCase
def test_hashing
assert_equal [ Topic.find(1) ], [ Topic.find(2).topic ] & [ Topic.find(1) ]
end
+
+ def test_comparison
+ topic_1 = Topic.create!
+ topic_2 = Topic.create!
+
+ assert_equal [topic_2, topic_1].sort, [topic_1, topic_2]
+ end
+
+ def test_comparison_with_different_objects
+ topic = Topic.create
+ category = Category.create(:name => "comparison")
+ assert_nil topic <=> category
+ end
def test_readonly_attributes
assert_equal Set.new([ 'title' , 'comments_count' ]), ReadonlyTitlePost.readonly_attributes