We get some deprecation warnings when running migrations:

2015-07-16T08:23:02 [app] [W] DEPRECATION WARNING: Calling set_table_name is deprecated. Please use `self.table_name = 'the_name'` instead. (called from <class:FakeComputeAttribute> at /home/dcleal/code/foreman/foreman/db/migrate/20150714140850_remove_new_from_compute_attributes.rb:2)

Also in db/migrate/20140219183343_migrate_permissions.rb where I copied it from for the above migration.

set_table_name just needs changing as per the message.