rails/rails — pull request #9733 by senny (2013-03-15 13:47:39+00:00)
Title: make it possible to disable implicit join references.

Closes #9712.

The feature can be disabled completely.

```ruby
# in your configuration
config.active_record.disable_implicit_join_references = true

# or directly
ActiveRecord::Base.disable_implicit_join_references = true
```