AR::UnknownAttributeError should include the class name of a record

This would be helpful if 2 models have an attribute that has a similar
name to the other. e.g:

before:

    User.new(name: "Yuki Nishijima", projects_attributes: [name: "kaminari"])
    # => ActiveRecord::UnknownAttributeError: unknown attribute: name

after:

    User.new(name: "Yuki Nishijima", projects_attributes: [name: "kaminari"])
    # => ActiveRecord::UnknownAttributeError: unknown attribute on User: name

1 files changed, 3 insertions, 3 deletions

diff --git a/activerecord/test/cases/attribute_methods_test.rb b/activerecord/test/cases/attribute_methods_test.rb
index 7ca7349528..3fdb70a137 100644
--- a/activerecord/test/cases/attribute_methods_test.rb
+++ b/activerecord/test/cases/attribute_methods_test.rb
@@ -736,11 +736,11 @@ class AttributeMethodsTest < ActiveRecord::TestCase
 
   def test_bulk_update_raise_unknown_attribute_error
     error = assert_raises(ActiveRecord::UnknownAttributeError) {
-      @target.new(:hello => "world")
+      Topic.new(:hello => "world")
     }
-    assert_instance_of @target, error.record
+    assert_instance_of Topic, error.record
     assert_equal "hello", error.attribute
-    assert_equal "unknown attribute: hello", error.message
+    assert_equal "unknown attribute on Topic: hello", error.message
   end
 
   def test_methods_override_in_multi_level_subclass