option to control if should run annotate on db:migrate. Only tested with…

tasks/migrate.rake

@@ -5,15 +5,32 @@
 # run after doing db:migrate. 
 # Unfortunately it relies on ENV for options; it'd be nice to be able to set options
 # in a per-project config file so this task can read them.
+
+def run_annotate_models?
+  update_on_migrate = true
+  (defined? ANNOTATE_MODELS_PREFS::UPDATE_ON_MIGRATE) && 
+    (!ANNOTATE_MODELS_PREFS::UPDATE_ON_MIGRATE.nil?) ? 
+      ANNOTATE_MODELS_PREFS::UPDATE_ON_MIGRATE : true
+end
+
+
 namespace :db do
   task :migrate do
+    if run_annotate_models?
+      Annotate::Migration.update_annotations
+    end
+  end
+
+  task :update => [:migrate] do
     Annotate::Migration.update_annotations
   end
 
   namespace :migrate do
     [:up, :down, :reset, :redo].each do |t|
       task t do
-        Annotate::Migration.update_annotations
+        if run_annotate_models?
+          Annotate::Migration.update_annotations
+        end
       end
     end
   end