3 files changed, 17 insertions, 4 deletions
diff --git a/activerecord/test/cases/associations/habtm_join_table_test.rb b/activerecord/test/cases/associations/habtm_join_table_test.rb
index 745f169ad7..bf3e04c3eb 100644
--- a/activerecord/test/cases/associations/habtm_join_table_test.rb
+++ b/activerecord/test/cases/associations/habtm_join_table_test.rb
@@ -36,9 +36,21 @@ class HabtmJoinTableTest < ActiveRecord::TestCase
   uses_transaction :test_should_raise_exception_when_join_table_has_a_primary_key
   def test_should_raise_exception_when_join_table_has_a_primary_key
     if ActiveRecord::Base.connection.supports_primary_key?
-      assert_raise ActiveRecord::HasAndBelongsToManyAssociationWithPrimaryKeyError do
-        MyReader.has_and_belongs_to_many :my_books
+      assert_raise ActiveRecord::ConfigurationError do
+        jaime = MyReader.create(:name=>"Jaime")
+        jaime.my_books << MyBook.create(:name=>'Great Expectations')
       end
     end
   end
+
+  uses_transaction :test_should_cache_result_of_primary_key_check
+  def test_should_cache_result_of_primary_key_check
+    if ActiveRecord::Base.connection.supports_primary_key?
+      ActiveRecord::Base.connection.stubs(:primary_key).with('my_books_my_readers').returns(false).once
+      weaz = MyReader.create(:name=>'Weaz')
+
+      weaz.my_books << MyBook.create(:name=>'Great Expectations')
+      weaz.my_books << MyBook.create(:name=>'Greater Expectations')
+    end
+  end
 end
diff --git a/activerecord/test/fixtures/edges.yml b/activerecord/test/fixtures/edges.yml
index b804f7b6a6..c16c70dd2f 100644
--- a/activerecord/test/fixtures/edges.yml
+++ b/activerecord/test/fixtures/edges.yml
@@ -1,5 +1,6 @@
 <% (1..4).each do |id| %>
 edge_<%= id %>:
+  id: <%= id %>
   source_id: <%= id %>
   sink_id: <%= id + 1 %>
-<% end %>
+<% end %>
+\ No newline at end of file
diff --git a/activerecord/test/schema/schema.rb b/activerecord/test/schema/schema.rb
index 5c12cb1a0c..9ab4cf6f43 100644
--- a/activerecord/test/schema/schema.rb
+++ b/activerecord/test/schema/schema.rb
@@ -159,7 +159,7 @@ ActiveRecord::Schema.define do
     t.integer :access_level, :default => 1
   end
 
-  create_table :edges, :force => true, :id => false do |t|
+  create_table :edges, :force => true do |t|
     t.column :source_id, :integer, :null => false
     t.column :sink_id,   :integer, :null => false
   end