allow has_many :through to work with custom :foreign key (closes #3422) [Rick Olson]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@3456 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

2 files changed, 8 insertions, 1 deletions

diff --git a/activerecord/test/associations_join_model_test.rb b/activerecord/test/associations_join_model_test.rb
index a011a0fae8..61488900d6 100644
--- a/activerecord/test/associations_join_model_test.rb
+++ b/activerecord/test/associations_join_model_test.rb
@@ -68,5 +68,9 @@ class AssociationsJoinModelTest < Test::Unit::TestCase
     assert_equal categories(:general), authors(:david).categories.find_by_name('General')
 #    assert_equal nil, authors(:david).categories.find_by_name('Technology')
   end
-    
+
+  def test_has_many_going_through_join_model_with_custom_foreign_key
+    assert_equal [], posts(:thinking).authors
+    assert_equal [authors(:mary)], posts(:authorless).authors
+  end
 end
diff --git a/activerecord/test/fixtures/post.rb b/activerecord/test/fixtures/post.rb
index 97b25179f5..ada18af115 100644
--- a/activerecord/test/fixtures/post.rb
+++ b/activerecord/test/fixtures/post.rb
@@ -23,6 +23,9 @@ class Post < ActiveRecord::Base
   has_many :taggings, :as => :taggable
   has_many :tags, :through => :taggings
 
+  has_many :categorizations, :foreign_key => :category_id
+  has_many :authors, :through => :categorizations
+
   def self.what_are_you
     'a post...'
   end