Don't use dynamic finders in this migration.

For whatever reason, the dynamic finders aren't available in this
migration and so the migration fails. Converting to find(:all,
:conditions => {...}) prevents this from not failing.

db/migrate/030_set_nil_timestamps.rb

@@ -1,19 +1,20 @@
 class SetNilTimestamps < ActiveRecord::Migration
 
   class Project < ActiveRecord::Base; end
+
   class Context < ActiveRecord::Base; end
 
   def self.up
-    Project.find_all_by_created_at(nil).each do |p|
+    Project.find(:all, :conditions => { :created_at => nil }).each do |p|
       Project.update( p.id, {:created_at => Time.now.utc} )
     end
-    Project.find_all_by_updated_at(nil).each do |p|
+    Project.find(:all, :conditions => { :created_at => nil }).each do |p|
       Project.update( p.id, {:updated_at => Time.now.utc} )
     end
-    Context.find_all_by_created_at(nil).each do |p|
+    Context.find(:all, :conditions => { :created_at => nil }).each do |p|
       Context.update( p.id, {:created_at => Time.now.utc} )
     end
-    Context.find_all_by_updated_at(nil).each do |p|
+    Context.find(:all, :conditions => { :created_at => nil }).each do |p|
       Context.update( p.id, {:updated_at => Time.now.utc} )
     end