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

activerecord/CHANGELOG

@@ -1,5 +1,7 @@
 *SVN*
 
+* Fix has_many :through << with custom foreign keys.  #6466, #7153 [naffis, Rich Collins]
+
 * Test DateTime native type in migrations.  #7649 [fedot]
 
 * SQLServer: correctly schema-dump tables with no indexes or descending indexes.  #7333, #7703 [Jakob S, Tom Ward]

activerecord/lib/active_record/associations/has_many_through_association.rb

@@ -138,7 +138,7 @@ module ActiveRecord
 
         # Construct attributes for :through pointing to owner and associate.
         def construct_join_attributes(associate)
-          construct_owner_attributes(@reflection.through_reflection).merge(@reflection.source_reflection.association_foreign_key => associate.id)
+          construct_owner_attributes(@reflection.through_reflection).merge(@reflection.source_reflection.primary_key_name => associate.id)
         end
 
         # Associate attributes pointing to owner, quoted.

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

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',