Move writing unknown column exception to null attribute

Making this change revealed several subtle bugs related to models with
no primary key, and anonymous classes. These have been fixed as well,
with regression tests added.

1 files changed, 9 insertions, 0 deletions

diff --git a/activerecord/test/cases/attribute_methods_test.rb b/activerecord/test/cases/attribute_methods_test.rb
index 7566af920f..2048e0d5ad 100644
--- a/activerecord/test/cases/attribute_methods_test.rb
+++ b/activerecord/test/cases/attribute_methods_test.rb
@@ -253,6 +253,15 @@ class AttributeMethodsTest < ActiveRecord::TestCase
     assert_equal @loaded_fixtures['computers']['workstation'].to_hash, Computer.first.attributes
   end
 
+  def test_attributes_without_primary_key
+    klass = Class.new(ActiveRecord::Base) do
+      self.table_name = 'developers_projects'
+    end
+
+    assert_equal klass.column_names, klass.new.attributes.keys
+    assert_not klass.new.attributes.key?('id')
+  end
+
   def test_hashes_not_mangled
     new_topic = { :title => "New Topic" }
     new_topic_values = { :title => "AnotherTopic" }