Merge pull request #451 from baroquebobcat/fixing_last_for_issue_371

activerecord/lib/active_record/relation/finder_methods.rb

@@ -375,7 +375,12 @@ module ActiveRecord
       if loaded?
         @records.last
       else
-        @last ||= reverse_order.limit(1).to_a[0]
+        @last ||=
+          if offset_value || limit_value
+            to_a.last
+          else
+            reverse_order.limit(1).to_a[0]
+          end
       end
     end
 

activerecord/test/cases/finder_test.rb

@@ -683,6 +683,27 @@ class FinderTest < ActiveRecord::TestCase
     assert_nil Topic.find_last_by_title_and_author_name(topic.title, "Anonymous")
   end
 
+  def test_find_last_with_limit_gives_same_result_when_loaded_and_unloaded
+    scope = Topic.limit(2)
+    unloaded_last = scope.last
+    loaded_last = scope.all.last
+    assert_equal loaded_last, unloaded_last
+  end
+
+  def test_find_last_with_limit_and_offset_gives_same_result_when_loaded_and_unloaded
+    scope = Topic.offset(2).limit(2)
+    unloaded_last = scope.last
+    loaded_last = scope.all.last
+    assert_equal loaded_last, unloaded_last
+  end
+
+  def test_find_last_with_offset_gives_same_result_when_loaded_and_unloaded
+    scope = Topic.offset(3)
+    unloaded_last = scope.last
+    loaded_last = scope.all.last
+    assert_equal loaded_last, unloaded_last
+  end
+
   def test_find_all_by_one_attribute
     topics = Topic.find_all_by_content("Have a nice day")
     assert_equal 2, topics.size