Fix merge request migration for postgres

db/migrate/20130218141327_convert_closed_to_state_in_merge_request.rb

 class ConvertClosedToStateInMergeRequest < ActiveRecord::Migration
   def up
     MergeRequest.transaction do
-      MergeRequest.where("closed = 1 AND merged = 1").update_all("state = 'merged'")
-      MergeRequest.where("closed = 1 AND merged = 0").update_all("state = 'closed'")
-      MergeRequest.where("closed = 0").update_all("state = 'opened'")
+      MergeRequest.where(closed: true, merged: true).update_all("state = 'merged'")
+      MergeRequest.where(closed: true, merged: true).update_all("state = 'closed'")
+      MergeRequest.where(closed: false).update_all("state = 'opened'")
     end
   end
 
   def down
     MergeRequest.transaction do
-      MergeRequest.where(state: :closed).update_all("closed = 1")
-      MergeRequest.where(state: :merged).update_all("closed = 1, merged = 1")
+      MergeRequest.where(state: :closed).update_all(closed: true)
+      MergeRequest.where(state: :merged).update_all(closed: true, merged: true)
     end
   end
 end