belongs_to infers the foreign key from the association name instead of from the class name. Fulfills the 1.2.4 deprecation.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7812 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activerecord/CHANGELOG

@@ -1,5 +1,7 @@
 *SVN*
 
+* belongs_to infers the foreign key from the association name instead of from the class name.  [Jeremy Kemper]
+
 * PostgreSQL: support multiline default values.  #7533 [Carl Lerche, aguynamedryan, Rein Henrichs, Tarmo Tänav]
 
 * MySQL: fix change_column on not-null columns that don't accept dfeault values of ''.  #6663 [Jonathan Viney, Tarmo Tänav]

activerecord/lib/active_record/associations.rb

@@ -1617,7 +1617,7 @@ def association_join
                             klass.quote_value(reflection.options[:source_type])
                           ]
                         else
-                          second_key = source_reflection.options[:foreign_key] || klass.to_s.foreign_key
+                          second_key = source_reflection.primary_key_name
                         end
                       end