Migration now points to db/migrate//

Also, could I possibly get a stack trace from when it had "require"?

The problem was indeed introduced by the aforementioned commit, but the cause is that Kernel#require doesn't load relative paths on Ruby 1.9.2 Ruby, while Kernel#load does.

There is even ticket for that issue: http://redmine.ruby-lang.org/issues/show/2710

Backtrace:

> rake --trace db:migrate
(in /mnt/hgfs/tourism_studies)
 Invoke db:migrate (first_time)
 Invoke environment (first_time)
 Execute environment
 Execute db:migrate
rake aborted!
no such file to load -- db/migrate//20100323145036_test_migration.rb
/mnt/hgfs/tourism_studies/vendor/rails/activesupport/lib/active_support/dependencies.rb:209:in require'
/mnt/hgfs/tourism_studies/vendor/rails/activesupport/lib/active_support/dependencies.rb:209:inblock in require'
/mnt/hgfs/tourism_studies/vendor/rails/activesupport/lib/active_support/dependencies.rb:195:in block in load_dependency'
/mnt/hgfs/tourism_studies/vendor/rails/activesupport/lib/active_support/dependencies.rb:523:innew_constants_in'
/mnt/hgfs/tourism_studies/vendor/rails/activesupport/lib/active_support/dependencies.rb:195:in load_dependency'
/mnt/hgfs/tourism_studies/vendor/rails/activesupport/lib/active_support/dependencies.rb:209:inrequire'
/mnt/hgfs/tourism_studies/vendor/rails/activerecord/lib/active_record/migration.rb:377:in load_migration'
/mnt/hgfs/tourism_studies/vendor/rails/activerecord/lib/active_record/migration.rb:373:inmigration'
/mnt/hgfs/tourism_studies/vendor/rails/activerecord/lib/active_record/migration.rb:373:in migrate'
/mnt/hgfs/tourism_studies/vendor/rails/activerecord/lib/active_record/migration.rb:506:inblock (2 levels) in migrate'
/mnt/hgfs/tourism_studies/vendor/rails/activerecord/lib/active_record/migration.rb:582:in call'
/mnt/hgfs/tourism_studies/vendor/rails/activerecord/lib/active_record/migration.rb:582:inddl_transaction'
/mnt/hgfs/tourism_studies/vendor/rails/activerecord/lib/active_record/migration.rb:505:in block in migrate'
/mnt/hgfs/tourism_studies/vendor/rails/activerecord/lib/active_record/migration.rb:492:ineach'
/mnt/hgfs/tourism_studies/vendor/rails/activerecord/lib/active_record/migration.rb:492:in migrate'
/mnt/hgfs/tourism_studies/vendor/rails/activerecord/lib/active_record/migration.rb:402:inup'
/mnt/hgfs/tourism_studies/vendor/rails/activerecord/lib/active_record/migration.rb:387:in migrate'</code>
</pre>



And my idea of fix:

diff --git a/activerecord/lib/active_record/migration.rb b/activerecord/lib/active_record/migration.rb
index 23e4505..4e7c24a 100644
--- a/activerecord/lib/active_record/migration.rb
+++ b/activerecord/lib/active_record/migration.rb
@@ -374,7 +374,7 @@ module ActiveRecord
       end

       def load_migration
-        require(filename)
+        require(Pathname(filename).relative? ? Rails.root + filename : filename)
         name.constantize
       end