fix migration

db/migrate/20130424121410_add_name_to_pool_versions.rb

@@ -2,7 +2,7 @@ class AddNameToPoolVersions < ActiveRecord::Migration
   def change
     execute("set statement_timeout = 0")
     add_column :pool_versions, :name, :string
-    PoolVersion.all.each do |pool_version|
+    PoolVersion.find_each do |pool_version|
       pool_version.update_column(:name, pool_version.pool.name)
     end
   end