rails/rails — pull request #8755 by robworley (2013-01-04 19:40:46+00:00)
Title: Support for PostgreSQL's ltree datatype

- Prevent "unknown OID" warnings when using [ltree](http://www.postgresql.org/docs/current/static/ltree.html) columns.
- Use ```t.ltree``` in migrations.
- Schema dumper support.

BTW I isolated the test case because the datatype is defined by an extension (installation is optional).