Fix sequence name with abstract classes.

activerecord/lib/active_record/base.rb

@@ -721,10 +721,10 @@ module ActiveRecord #:nodoc:
       end
 
       def sequence_name
-        if superclass == Base
+        if base_class == self
           @sequence_name ||= reset_sequence_name
         else
-          (@sequence_name ||= nil) || superclass.sequence_name
+          (@sequence_name ||= nil) || base_class.sequence_name
         end
       end
 

activerecord/test/cases/base_test.rb

@@ -1601,6 +1601,16 @@ class BasicsTest < ActiveRecord::TestCase
     end
   end
 
+  def test_sequence_name_with_abstract_class
+    ak = Class.new(ActiveRecord::Base)
+    ak.abstract_class = true
+    k = Class.new(ak)
+    k.table_name = "projects"
+    orig_name = k.sequence_name
+    return skip "sequences not supported by db" unless orig_name
+    assert_equal k.reset_sequence_name, orig_name
+  end
+
   def test_count_with_join
     res = Post.count_by_sql "SELECT COUNT(*) FROM posts LEFT JOIN comments ON posts.id=comments.post_id WHERE posts.#{QUOTED_TYPE} = 'Post'"