Fix has_many :through << with custom foreign keys. Closes #6466, #7153.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@6336 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

2 files changed, 7 insertions, 2 deletions

diff --git a/activerecord/test/associations/join_model_test.rb b/activerecord/test/associations/join_model_test.rb
index 1124a0ace0..1d2a4f6c5c 100644
--- a/activerecord/test/associations/join_model_test.rb
+++ b/activerecord/test/associations/join_model_test.rb
@@ -6,10 +6,12 @@ require 'fixtures/comment'
 require 'fixtures/author'
 require 'fixtures/category'
 require 'fixtures/categorization'
+require 'fixtures/vertex'
+require 'fixtures/edge'
 
 class AssociationsJoinModelTest < Test::Unit::TestCase
   self.use_transactional_fixtures = false
-  fixtures :posts, :authors, :categories, :categorizations, :comments, :tags, :taggings, :author_favorites
+  fixtures :posts, :authors, :categories, :categorizations, :comments, :tags, :taggings, :author_favorites, :vertices
 
   def test_has_many
     assert authors(:david).categories.include?(categories(:general))
@@ -414,6 +416,9 @@ class AssociationsJoinModelTest < Test::Unit::TestCase
                 message = "Expected a Tagging in taggings collection, got #{wrong.class}.")
     assert_equal(count + 4, post_thinking.tags.size)
     assert_equal(count + 4, post_thinking.tags(true).size)
+
+    # Raises if the wrong reflection name is used to set the Edge belongs_to
+    assert_nothing_raised { vertices(:vertex_1).sinks << vertices(:vertex_5) }
   end
 
   def test_adding_junk_to_has_many_through_should_raise_type_mismatch
diff --git a/activerecord/test/fixtures/vertex.rb b/activerecord/test/fixtures/vertex.rb
index f4c11144de..48bb851e62 100644
--- a/activerecord/test/fixtures/vertex.rb
+++ b/activerecord/test/fixtures/vertex.rb
@@ -1,7 +1,7 @@
 # This class models a vertex in a directed graph.
 class Vertex < ActiveRecord::Base
   has_many :sink_edges, :class_name => 'Edge', :foreign_key => 'source_id'
-  has_many :sinks, :through => :sink_edges, :source => :sink
+  has_many :sinks, :through => :sink_edges
 
   has_and_belongs_to_many :sources,
     :class_name => 'Vertex', :join_table => 'edges',