修改作业历史数据的问题

db/migrate/20150422034543_change_bid_open_anonymous_evaluation.rb

@@ -0,0 +1,8 @@
+class ChangeBidOpenAnonymousEvaluation < ActiveRecord::Migration
+  def chang
+    Bid.where("open_anonymous_evaluation IS NULL").each do |bid|
+      bid.open_anonymous_evaluation = 0
+      bid.save
+    end
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20150415032102) do
+ActiveRecord::Schema.define(:version => 20150422034543) do
 
   create_table "activities", :force => true do |t|
     t.integer "act_id",   :null => false